diff --git a/.github/workflows/contracts-evm.yml b/.github/workflows/contracts-evm.yml
index 2a942d3f..aec3aa6e 100644
--- a/.github/workflows/contracts-evm.yml
+++ b/.github/workflows/contracts-evm.yml
@@ -60,6 +60,13 @@ jobs:
       - name: Compile contracts
         run: npx hardhat compile
 
+      - name: Validate upgrade safety (OZ dry-run)
+        run: npx hardhat run scripts/upgrade.ts --network hardhat
+        env:
+          PROPOSE_ONLY: 'true'
+          SPLITTER_CONTRACT: SplitterV2
+        continue-on-error: true
+
       - name: Type-check scripts & tests
         run: npm run lint
 
diff --git a/.github/workflows/platform-services.yml b/.github/workflows/platform-services.yml
new file mode 100644
index 00000000..6794532d
--- /dev/null
+++ b/.github/workflows/platform-services.yml
@@ -0,0 +1,129 @@
+name: Platform Services (#473–476)
+
+on:
+  push:
+    branches: [main, dev]
+  pull_request:
+    branches: [main, dev]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  backend-services:
+    name: Archival / Upgrade / Bridge tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    defaults:
+      run:
+        working-directory: backend
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: package-lock.json
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+        working-directory: .
+
+      - name: Generate Prisma client
+        run: npm run db:generate
+        working-directory: backend
+
+      - name: Run service tests (#473–475)
+        run: npm test -- src/services/__tests__/issues-473-475.test.ts
+        working-directory: backend
+
+      - name: Validate Prisma schema drift
+        run: npm run db:migrate:check
+        working-directory: backend
+        env:
+          DATABASE_URL: postgresql://postgres:postgres@localhost:5432/agenticpay_ci
+
+  i18n:
+    name: Translation parity check
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: package-lock.json
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+        working-directory: .
+
+      - name: Check translation key parity
+        run: npm run i18n:check
+        working-directory: frontend
+
+  i18n-sync:
+    name: DeepL translation sync (manual)
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+        working-directory: .
+
+      - name: Sync missing translations via DeepL
+        run: npm run i18n:sync
+        working-directory: frontend
+        env:
+          DEEPL_API_KEY: ${{ secrets.DEEPL_API_KEY }}
+
+      - name: Verify parity after sync
+        run: npm run i18n:check
+        working-directory: frontend
+
+  upgrade-validation:
+    name: Contract upgrade safety gate
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    defaults:
+      run:
+        working-directory: contracts/evm
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: contracts/evm/package-lock.json
+
+      - name: Install EVM contract dependencies
+        run: npm ci --prefer-offline
+
+      - name: Compile contracts
+        run: npx hardhat compile
+
+      - name: Run OZ upgrade validation (dry-run)
+        run: npx hardhat run scripts/upgrade.ts --network hardhat
+        env:
+          PROPOSE_ONLY: 'true'
+          SPLITTER_CONTRACT: SplitterV2
+        continue-on-error: true
diff --git a/backend/prisma/migrations/20260627120000_archival_upgrade_bridge/migration.sql b/backend/prisma/migrations/20260627120000_archival_upgrade_bridge/migration.sql
new file mode 100644
index 00000000..2a535718
--- /dev/null
+++ b/backend/prisma/migrations/20260627120000_archival_upgrade_bridge/migration.sql
@@ -0,0 +1,173 @@
+-- Issue #473, #474, #475: Archival, upgrade validation, and bridge monitoring models
+
+-- CreateEnum
+CREATE TYPE "ArchivalBatchStatus" AS ENUM ('pending', 'collecting', 'compressing', 'uploading', 'completed', 'failed', 'restoring');
+CREATE TYPE "ArchivalChain" AS ENUM ('stellar', 'ethereum', 'polygon', 'base', 'arbitrum', 'soroban');
+CREATE TYPE "UpgradeValidationStatus" AS ENUM ('pending', 'running', 'passed', 'failed', 'rolled_back');
+CREATE TYPE "ContractPlatform" AS ENUM ('evm', 'soroban');
+CREATE TYPE "BridgeProvider" AS ENUM ('wormhole', 'layerzero', 'axelar', 'custom');
+CREATE TYPE "BridgeMessageStatus" AS ENUM ('initiated', 'source_confirmed', 'relayed', 'destination_executed', 'failed', 'stuck', 'expired');
+CREATE TYPE "BridgeAlertSeverity" AS ENUM ('info', 'warning', 'critical');
+
+-- CreateTable
+CREATE TABLE "archival_batches" (
+    "id" TEXT NOT NULL,
+    "batch_date" DATE NOT NULL,
+    "status" "ArchivalBatchStatus" NOT NULL DEFAULT 'pending',
+    "chain" "ArchivalChain" NOT NULL,
+    "record_count" INTEGER NOT NULL DEFAULT 0,
+    "uncompressed_bytes" BIGINT NOT NULL DEFAULT 0,
+    "compressed_bytes" BIGINT NOT NULL DEFAULT 0,
+    "content_hash" TEXT,
+    "ipfs_cid" TEXT,
+    "ipfs_url" TEXT,
+    "verified_hash" TEXT,
+    "error_message" TEXT,
+    "retention_until" TIMESTAMP(3) NOT NULL,
+    "started_at" TIMESTAMP(3),
+    "completed_at" TIMESTAMP(3),
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "archival_batches_pkey" PRIMARY KEY ("id")
+);
+
+CREATE TABLE "data_archives" (
+    "id" TEXT NOT NULL,
+    "batch_id" TEXT NOT NULL,
+    "chain" "ArchivalChain" NOT NULL,
+    "tx_hash" TEXT NOT NULL,
+    "block_number" BIGINT NOT NULL,
+    "block_hash" TEXT,
+    "payload" JSONB NOT NULL,
+    "payload_hash" TEXT NOT NULL,
+    "proof_of_inclusion" JSONB NOT NULL,
+    "indexed_at" TIMESTAMP(3),
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "data_archives_pkey" PRIMARY KEY ("id")
+);
+
+CREATE TABLE "contract_upgrades" (
+    "id" TEXT NOT NULL,
+    "contract_name" TEXT NOT NULL,
+    "platform" "ContractPlatform" NOT NULL,
+    "network" TEXT NOT NULL,
+    "proxy_address" TEXT NOT NULL,
+    "previous_implementation" TEXT,
+    "new_implementation" TEXT NOT NULL,
+    "deployer_address" TEXT,
+    "timelock_address" TEXT,
+    "status" "UpgradeValidationStatus" NOT NULL DEFAULT 'pending',
+    "deployed_at" TIMESTAMP(3),
+    "rolled_back_at" TIMESTAMP(3),
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "contract_upgrades_pkey" PRIMARY KEY ("id")
+);
+
+CREATE TABLE "upgrade_validation_reports" (
+    "id" TEXT NOT NULL,
+    "upgrade_id" TEXT NOT NULL,
+    "status" "UpgradeValidationStatus" NOT NULL,
+    "storage_layout_diff" JSONB,
+    "simulation_passed" BOOLEAN NOT NULL DEFAULT false,
+    "smoke_tests_passed" BOOLEAN NOT NULL DEFAULT false,
+    "admin_preserved" BOOLEAN NOT NULL DEFAULT false,
+    "proxy_admin_valid" BOOLEAN NOT NULL DEFAULT false,
+    "implementation_verified" BOOLEAN NOT NULL DEFAULT false,
+    "failures" JSONB,
+    "warnings" JSONB,
+    "fork_block_number" BIGINT,
+    "duration_ms" INTEGER,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "upgrade_validation_reports_pkey" PRIMARY KEY ("id")
+);
+
+CREATE TABLE "bridge_messages" (
+    "id" TEXT NOT NULL,
+    "provider" "BridgeProvider" NOT NULL,
+    "source_chain" TEXT NOT NULL,
+    "destination_chain" TEXT NOT NULL,
+    "message_id" TEXT NOT NULL,
+    "tx_hash_source" TEXT,
+    "tx_hash_destination" TEXT,
+    "status" "BridgeMessageStatus" NOT NULL DEFAULT 'initiated',
+    "amount" TEXT,
+    "token_address" TEXT,
+    "sender" TEXT,
+    "recipient" TEXT,
+    "gas_cost_source" TEXT,
+    "gas_cost_destination" TEXT,
+    "initiated_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "source_confirmed_at" TIMESTAMP(3),
+    "relayed_at" TIMESTAMP(3),
+    "executed_at" TIMESTAMP(3),
+    "expected_delivery_ms" INTEGER NOT NULL DEFAULT 300000,
+    "metadata" JSONB,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "bridge_messages_pkey" PRIMARY KEY ("id")
+);
+
+CREATE TABLE "bridge_alerts" (
+    "id" TEXT NOT NULL,
+    "message_id" TEXT NOT NULL,
+    "severity" "BridgeAlertSeverity" NOT NULL,
+    "alert_type" TEXT NOT NULL,
+    "message" TEXT NOT NULL,
+    "acknowledged" BOOLEAN NOT NULL DEFAULT false,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "bridge_alerts_pkey" PRIMARY KEY ("id")
+);
+
+CREATE TABLE "bridge_retries" (
+    "id" TEXT NOT NULL,
+    "message_id" TEXT NOT NULL,
+    "attempt" INTEGER NOT NULL DEFAULT 1,
+    "status" TEXT NOT NULL DEFAULT 'pending',
+    "tx_hash" TEXT,
+    "error_message" TEXT,
+    "initiated_by" TEXT,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "completed_at" TIMESTAMP(3),
+
+    CONSTRAINT "bridge_retries_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "archival_batches_batch_date_chain_key" ON "archival_batches"("batch_date", "chain");
+CREATE INDEX "archival_batches_status_idx" ON "archival_batches"("status");
+CREATE INDEX "archival_batches_batch_date_idx" ON "archival_batches"("batch_date");
+CREATE INDEX "archival_batches_ipfs_cid_idx" ON "archival_batches"("ipfs_cid");
+
+CREATE INDEX "data_archives_batch_id_idx" ON "data_archives"("batch_id");
+CREATE INDEX "data_archives_chain_tx_hash_idx" ON "data_archives"("chain", "tx_hash");
+CREATE INDEX "data_archives_block_number_idx" ON "data_archives"("block_number");
+
+CREATE INDEX "contract_upgrades_network_contract_name_idx" ON "contract_upgrades"("network", "contract_name");
+CREATE INDEX "contract_upgrades_status_idx" ON "contract_upgrades"("status");
+
+CREATE INDEX "upgrade_validation_reports_upgrade_id_idx" ON "upgrade_validation_reports"("upgrade_id");
+CREATE INDEX "upgrade_validation_reports_status_idx" ON "upgrade_validation_reports"("status");
+
+CREATE UNIQUE INDEX "bridge_messages_provider_message_id_key" ON "bridge_messages"("provider", "message_id");
+CREATE INDEX "bridge_messages_status_idx" ON "bridge_messages"("status");
+CREATE INDEX "bridge_messages_provider_idx" ON "bridge_messages"("provider");
+CREATE INDEX "bridge_messages_source_chain_destination_chain_idx" ON "bridge_messages"("source_chain", "destination_chain");
+CREATE INDEX "bridge_messages_initiated_at_idx" ON "bridge_messages"("initiated_at");
+
+CREATE INDEX "bridge_alerts_message_id_idx" ON "bridge_alerts"("message_id");
+CREATE INDEX "bridge_alerts_severity_idx" ON "bridge_alerts"("severity");
+
+CREATE INDEX "bridge_retries_message_id_idx" ON "bridge_retries"("message_id");
+
+-- AddForeignKey
+ALTER TABLE "data_archives" ADD CONSTRAINT "data_archives_batch_id_fkey" FOREIGN KEY ("batch_id") REFERENCES "archival_batches"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE "upgrade_validation_reports" ADD CONSTRAINT "upgrade_validation_reports_upgrade_id_fkey" FOREIGN KEY ("upgrade_id") REFERENCES "contract_upgrades"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE "bridge_alerts" ADD CONSTRAINT "bridge_alerts_message_id_fkey" FOREIGN KEY ("message_id") REFERENCES "bridge_messages"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE "bridge_retries" ADD CONSTRAINT "bridge_retries_message_id_fkey" FOREIGN KEY ("message_id") REFERENCES "bridge_messages"("id") ON DELETE CASCADE ON UPDATE CASCADE;
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 23fe862f..0f44b5d6 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -1001,3 +1001,227 @@ model PaymentCategoryAssignment {
   @@index([categoryId])
   @@map("payment_category_assignments")
 }
+
+// ─── On-Chain Data Archival — Issue #473 ─────────────────────────────────────
+
+enum ArchivalBatchStatus {
+  pending
+  collecting
+  compressing
+  uploading
+  completed
+  failed
+  restoring
+}
+
+enum ArchivalChain {
+  stellar
+  ethereum
+  polygon
+  base
+  arbitrum
+  soroban
+}
+
+model ArchivalBatch {
+  id                String              @id @default(uuid())
+  batchDate         DateTime            @db.Date @map("batch_date")
+  status            ArchivalBatchStatus @default(pending)
+  chain             ArchivalChain
+  recordCount       Int                 @default(0) @map("record_count")
+  uncompressedBytes BigInt              @default(0) @map("uncompressed_bytes")
+  compressedBytes   BigInt              @default(0) @map("compressed_bytes")
+  contentHash       String?             @map("content_hash")
+  ipfsCid           String?             @map("ipfs_cid")
+  ipfsUrl           String?             @map("ipfs_url")
+  verifiedHash      String?             @map("verified_hash")
+  errorMessage      String?             @map("error_message")
+  retentionUntil    DateTime            @map("retention_until")
+  startedAt         DateTime?           @map("started_at")
+  completedAt       DateTime?           @map("completed_at")
+  createdAt         DateTime            @default(now()) @map("created_at")
+  updatedAt         DateTime            @updatedAt @map("updated_at")
+
+  records DataArchive[]
+
+  @@unique([batchDate, chain])
+  @@index([status])
+  @@index([batchDate])
+  @@index([ipfsCid])
+  @@map("archival_batches")
+}
+
+model DataArchive {
+  id               String        @id @default(uuid())
+  batchId          String        @map("batch_id")
+  chain            ArchivalChain
+  txHash           String        @map("tx_hash")
+  blockNumber      BigInt        @map("block_number")
+  blockHash        String?       @map("block_hash")
+  payload          Json
+  payloadHash      String        @map("payload_hash")
+  proofOfInclusion Json          @map("proof_of_inclusion")
+  indexedAt        DateTime?     @map("indexed_at")
+  createdAt        DateTime      @default(now()) @map("created_at")
+
+  batch ArchivalBatch @relation(fields: [batchId], references: [id], onDelete: Cascade)
+
+  @@index([batchId])
+  @@index([chain, txHash])
+  @@index([blockNumber])
+  @@map("data_archives")
+}
+
+// ─── Contract Upgrade Safety — Issue #474 ────────────────────────────────────
+
+enum UpgradeValidationStatus {
+  pending
+  running
+  passed
+  failed
+  rolled_back
+}
+
+enum ContractPlatform {
+  evm
+  soroban
+}
+
+model ContractUpgrade {
+  id                     String                  @id @default(uuid())
+  contractName           String                  @map("contract_name")
+  platform               ContractPlatform
+  network                String
+  proxyAddress           String                  @map("proxy_address")
+  previousImplementation String?                 @map("previous_implementation")
+  newImplementation      String                  @map("new_implementation")
+  deployerAddress        String?                 @map("deployer_address")
+  timelockAddress        String?                 @map("timelock_address")
+  status                 UpgradeValidationStatus @default(pending)
+  deployedAt             DateTime?               @map("deployed_at")
+  rolledBackAt           DateTime?               @map("rolled_back_at")
+  createdAt              DateTime                @default(now()) @map("created_at")
+  updatedAt              DateTime                @updatedAt @map("updated_at")
+
+  validationReports UpgradeValidationReport[]
+
+  @@index([network, contractName])
+  @@index([status])
+  @@map("contract_upgrades")
+}
+
+model UpgradeValidationReport {
+  id                     String                  @id @default(uuid())
+  upgradeId              String                  @map("upgrade_id")
+  status                 UpgradeValidationStatus
+  storageLayoutDiff      Json?                   @map("storage_layout_diff")
+  simulationPassed       Boolean                 @default(false) @map("simulation_passed")
+  smokeTestsPassed       Boolean                 @default(false) @map("smoke_tests_passed")
+  adminPreserved         Boolean                 @default(false) @map("admin_preserved")
+  proxyAdminValid        Boolean                 @default(false) @map("proxy_admin_valid")
+  implementationVerified Boolean                 @default(false) @map("implementation_verified")
+  failures               Json?
+  warnings               Json?
+  forkBlockNumber        BigInt?                 @map("fork_block_number")
+  durationMs             Int?                    @map("duration_ms")
+  createdAt              DateTime                @default(now()) @map("created_at")
+
+  upgrade ContractUpgrade @relation(fields: [upgradeId], references: [id], onDelete: Cascade)
+
+  @@index([upgradeId])
+  @@index([status])
+  @@map("upgrade_validation_reports")
+}
+
+// ─── Bridge Monitoring — Issue #475 ────────────────────────────────────────
+
+enum BridgeProvider {
+  wormhole
+  layerzero
+  axelar
+  custom
+}
+
+enum BridgeMessageStatus {
+  initiated
+  source_confirmed
+  relayed
+  destination_executed
+  failed
+  stuck
+  expired
+}
+
+enum BridgeAlertSeverity {
+  info
+  warning
+  critical
+}
+
+model BridgeMessage {
+  id                 String              @id @default(uuid())
+  provider           BridgeProvider
+  sourceChain        String              @map("source_chain")
+  destinationChain   String              @map("destination_chain")
+  messageId          String              @map("message_id")
+  txHashSource       String?             @map("tx_hash_source")
+  txHashDestination  String?             @map("tx_hash_destination")
+  status             BridgeMessageStatus @default(initiated)
+  amount             String?
+  tokenAddress       String?             @map("token_address")
+  sender             String?
+  recipient          String?
+  gasCostSource      String?             @map("gas_cost_source")
+  gasCostDestination String?             @map("gas_cost_destination")
+  initiatedAt        DateTime            @default(now()) @map("initiated_at")
+  sourceConfirmedAt  DateTime?           @map("source_confirmed_at")
+  relayedAt          DateTime?           @map("relayed_at")
+  executedAt         DateTime?           @map("executed_at")
+  expectedDeliveryMs Int                 @default(300000) @map("expected_delivery_ms")
+  metadata           Json?
+  createdAt          DateTime            @default(now()) @map("created_at")
+  updatedAt          DateTime            @updatedAt @map("updated_at")
+
+  alerts  BridgeAlert[]
+  retries BridgeRetry[]
+
+  @@unique([provider, messageId])
+  @@index([status])
+  @@index([provider])
+  @@index([sourceChain, destinationChain])
+  @@index([initiatedAt])
+  @@map("bridge_messages")
+}
+
+model BridgeAlert {
+  id           String              @id @default(uuid())
+  messageId    String              @map("message_id")
+  severity     BridgeAlertSeverity
+  alertType    String              @map("alert_type")
+  message      String
+  acknowledged Boolean             @default(false)
+  createdAt    DateTime            @default(now()) @map("created_at")
+
+  bridgeMessage BridgeMessage @relation(fields: [messageId], references: [id], onDelete: Cascade)
+
+  @@index([messageId])
+  @@index([severity])
+  @@map("bridge_alerts")
+}
+
+model BridgeRetry {
+  id           String    @id @default(uuid())
+  messageId    String    @map("message_id")
+  attempt      Int       @default(1)
+  status       String    @default("pending")
+  txHash       String?   @map("tx_hash")
+  errorMessage String?   @map("error_message")
+  initiatedBy  String?   @map("initiated_by")
+  createdAt    DateTime  @default(now()) @map("created_at")
+  completedAt  DateTime? @map("completed_at")
+
+  bridgeMessage BridgeMessage @relation(fields: [messageId], references: [id], onDelete: Cascade)
+
+  @@index([messageId])
+  @@map("bridge_retries")
+}
diff --git a/backend/src/config/scheduled-tasks.ts b/backend/src/config/scheduled-tasks.ts
index e2273299..63282faf 100644
--- a/backend/src/config/scheduled-tasks.ts
+++ b/backend/src/config/scheduled-tasks.ts
@@ -19,6 +19,8 @@ import { markOverdueRequests } from '../services/gdpr.js';
 import { sandboxCleanupJobs } from '../jobs/sandbox-cleanup.js';
 import { SubscriptionService } from '../services/subscription.service.js';
 import { SubscriptionProcessor } from '../jobs/subscription-processor.js';
+import { getArchivalService } from '../services/archival/index.js';
+import { getBridgeMonitorService } from '../services/bridge-monitor/bridge-monitor.js';
 import { ethers } from 'ethers';
 
 // ---------------------------------------------------------------------------
@@ -158,6 +160,50 @@ const RAW_TASKS: Omit<ScheduledTaskMeta, 'schedule'> & { defaultSchedule: string
     defaultSchedule: '0 0 * * *',
     handler: sandboxCleanupJobs.find((j) => j.id === 'sandbox-maintenance-stats')!.handler,
   },
+  {
+    id: 'daily-onchain-archival',
+    name: 'Daily On-Chain Data Archival',
+    description: 'Backs up transaction data, event logs, and contract state to IPFS with integrity verification.',
+    defaultSchedule: '0 3 * * *',
+    timezone: 'UTC',
+    timeoutMs: 60 * 60 * 1000,
+    handler: async () => {
+      const result = await getArchivalService().runDailyArchival();
+      if (result.ok) {
+        console.log(`[archival] Daily batch complete: ${result.value.batchesProcessed} chain(s) archived`);
+      } else {
+        console.error('[archival] Daily batch failed:', result.error.message);
+      }
+    },
+  },
+  {
+    id: 'bridge-monitor-reconcile',
+    name: 'Bridge Message Reconciliation',
+    description: 'Polls bridge providers, detects stuck/delayed messages, and emits alerts.',
+    defaultSchedule: '*/5 * * * *',
+    timeoutMs: 5 * 60 * 1000,
+    handler: async () => {
+      await getBridgeMonitorService().pollAndReconcile();
+    },
+  },
+  {
+    id: 'archival-retention-cleanup',
+    name: 'Archival retention enforcement',
+    description: 'Removes archival batches past the 7-year retention window.',
+    defaultSchedule: '0 4 * * 0',
+    timezone: 'UTC',
+    handler: async () => {
+      if (!process.env.DATABASE_URL) return;
+      const { prisma } = await import('../lib/prisma.js');
+      const cutoff = new Date();
+      const deleted = await prisma.archivalBatch.deleteMany({
+        where: { retentionUntil: { lt: cutoff } },
+      });
+      if (deleted.count > 0) {
+        console.log(`[archival] Purged ${deleted.count} expired batch(es)`);
+      }
+    },
+  },
 ];
 
 // ---------------------------------------------------------------------------
diff --git a/backend/src/index.ts b/backend/src/index.ts
index 81171615..dbc4ea4f 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -44,6 +44,9 @@ import { flagsRouter } from './routes/flags.js';
 import { emailRouter } from './routes/email.js';
 import { portfolioRouter } from './routes/portfolio.js';
 import { backupRouter } from './routes/backup.js';
+import { archivalRouter } from './routes/archival.js';
+import { upgradeValidatorRouter } from './routes/upgrade-validator.js';
+import { bridgeMonitorRouter } from './routes/bridge-monitor.js';
 import { pushRouter } from './routes/push.js';
 import { ipAllowlistRouter } from './routes/ip-allowlist.js';
 import { nfcRouter } from './routes/nfc.js';
@@ -117,6 +120,7 @@ import { startOutboxPublisher, stopOutboxPublisher } from './outbox/index.js';
 import { gasRouter } from './routes/gas.js';
 import { vaultsRouter } from './routes/vaults.js';
 import { createConnectionManager } from './websocket/connection-manager.js';
+import { getBridgeMonitorService } from './services/bridge-monitor/bridge-monitor.js';
 
 // Validate environment variables at startup
 validateEnv();
@@ -273,6 +277,9 @@ apiV1Router.use('/disputes', disputeRoutes);
 apiV1Router.use('/emails', emailRouter);
 apiV1Router.use('/portfolio', portfolioRouter);
 apiV1Router.use('/backup', backupRouter);
+apiV1Router.use('/archival', archivalRouter);
+apiV1Router.use('/admin/contracts/upgrade', upgradeValidatorRouter);
+apiV1Router.use('/bridge/monitor', bridgeMonitorRouter);
 apiV1Router.use('/ip-allowlist', ipAllowlistRouter);
 apiV1Router.use('/push', pushRouter);
 apiV1Router.use('/nfc', nfcRouter);
@@ -342,6 +349,9 @@ app.use('/api/v1/admin/plugins', pluginsRouter);
 
 // Smart contract emergency pause management (Issue #513)
 app.use('/api/v1/admin/contracts/pause', pauseManagerRouter);
+app.use('/api/v1/admin/contracts/upgrade', upgradeValidatorRouter);
+app.use('/api/v1/archival', archivalRouter);
+app.use('/api/v1/bridge/monitor', bridgeMonitorRouter);
 app.use('/api/v1/gas', gasRouter);
 app.use('/api/v1/vaults', vaultsRouter);
 
@@ -525,6 +535,11 @@ server.listen(config.server.port, () => {
     }).catch(() => {
       console.log('[RedisCache] Not available, using in-memory cache only');
     });
+
+    // Bridge monitoring — Issue #475
+    getBridgeMonitorService().start(
+      parseInt(process.env.BRIDGE_MONITOR_POLL_MS ?? '30000', 10),
+    );
   });
 });
 
@@ -577,6 +592,13 @@ const shutdown = (signal: string) => {
       console.error('Error stopping batch processor:', err);
     }
 
+    try {
+      getBridgeMonitorService().stop();
+      console.log('Bridge monitor stopped.');
+    } catch (err) {
+      console.error('Error stopping bridge monitor:', err);
+    }
+
     clearInterval(analyticsInterval);
 
     try {
diff --git a/backend/src/routes/archival.ts b/backend/src/routes/archival.ts
new file mode 100644
index 00000000..19195b80
--- /dev/null
+++ b/backend/src/routes/archival.ts
@@ -0,0 +1,58 @@
+import { Router } from 'express';
+import { z } from 'zod';
+import { validate } from '../middleware/validate.js';
+import { asyncHandler, AppError } from '../middleware/errorHandler.js';
+import { getArchivalService } from '../services/archival/index.js';
+
+export const archivalRouter = Router();
+
+const restoreSchema = z.object({
+  batchId: z.string().uuid(),
+});
+
+archivalRouter.get(
+  '/dashboard',
+  asyncHandler(async (_req, res) => {
+    const result = await getArchivalService().getDashboard();
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+archivalRouter.get(
+  '/batches',
+  asyncHandler(async (req, res) => {
+    const limit = parseInt(String(req.query.limit ?? '20'), 10);
+    const result = await getArchivalService().listBatches(limit);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+archivalRouter.post(
+  '/run',
+  asyncHandler(async (_req, res) => {
+    const result = await getArchivalService().runDailyArchival();
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+archivalRouter.post(
+  '/restore',
+  validate(restoreSchema),
+  asyncHandler(async (req, res) => {
+    const result = await getArchivalService().restoreBatch(req.body.batchId);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+archivalRouter.post(
+  '/restore/:batchId',
+  asyncHandler(async (req, res) => {
+    const result = await getArchivalService().restoreBatch(req.params.batchId);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
diff --git a/backend/src/routes/bridge-monitor.ts b/backend/src/routes/bridge-monitor.ts
new file mode 100644
index 00000000..ccb86fee
--- /dev/null
+++ b/backend/src/routes/bridge-monitor.ts
@@ -0,0 +1,100 @@
+import { Router } from 'express';
+import { z } from 'zod';
+import { validate } from '../middleware/validate.js';
+import { asyncHandler, AppError } from '../middleware/errorHandler.js';
+import { getBridgeMonitorService } from '../services/bridge-monitor/bridge-monitor.js';
+
+export const bridgeMonitorRouter = Router();
+
+const trackSchema = z.object({
+  provider: z.enum(['wormhole', 'layerzero', 'axelar', 'custom']),
+  messageId: z.string().min(1),
+  sourceChain: z.string().min(1),
+  destinationChain: z.string().min(1),
+  status: z.enum([
+    'initiated',
+    'source_confirmed',
+    'relayed',
+    'destination_executed',
+    'failed',
+    'stuck',
+    'expired',
+  ]),
+  txHashSource: z.string().optional(),
+  txHashDestination: z.string().optional(),
+  amount: z.string().optional(),
+  tokenAddress: z.string().optional(),
+  sender: z.string().optional(),
+  recipient: z.string().optional(),
+  gasCostSource: z.string().optional(),
+  gasCostDestination: z.string().optional(),
+  metadata: z.record(z.unknown()).optional(),
+});
+
+bridgeMonitorRouter.get(
+  '/health',
+  asyncHandler(async (_req, res) => {
+    const result = await getBridgeMonitorService().getHealth();
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+bridgeMonitorRouter.get(
+  '/analytics',
+  asyncHandler(async (req, res) => {
+    const days = parseInt(String(req.query.days ?? '30'), 10);
+    const result = await getBridgeMonitorService().getAnalytics(days);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+bridgeMonitorRouter.get(
+  '/messages',
+  asyncHandler(async (req, res) => {
+    const result = await getBridgeMonitorService().listMessages({
+      provider: req.query.provider as 'wormhole' | 'layerzero' | 'axelar' | 'custom' | undefined,
+      status: req.query.status as
+        | 'initiated'
+        | 'source_confirmed'
+        | 'relayed'
+        | 'destination_executed'
+        | 'failed'
+        | 'stuck'
+        | 'expired'
+        | undefined,
+      limit: parseInt(String(req.query.limit ?? '50'), 10),
+    });
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+bridgeMonitorRouter.post(
+  '/messages',
+  validate(trackSchema),
+  asyncHandler(async (req, res) => {
+    const result = await getBridgeMonitorService().trackMessage(req.body);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.status(201).json(result.value);
+  }),
+);
+
+bridgeMonitorRouter.post(
+  '/messages/:id/retry',
+  asyncHandler(async (req, res) => {
+    const initiatedBy = req.headers['x-user-id'] as string | undefined;
+    const result = await getBridgeMonitorService().retryMessage(req.params.id, initiatedBy);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+bridgeMonitorRouter.post(
+  '/poll',
+  asyncHandler(async (_req, res) => {
+    await getBridgeMonitorService().pollAndReconcile();
+    res.json({ polled: true, timestamp: new Date().toISOString() });
+  }),
+);
diff --git a/backend/src/routes/upgrade-validator.ts b/backend/src/routes/upgrade-validator.ts
new file mode 100644
index 00000000..97cfc8a5
--- /dev/null
+++ b/backend/src/routes/upgrade-validator.ts
@@ -0,0 +1,53 @@
+import { Router } from 'express';
+import { z } from 'zod';
+import { validate } from '../middleware/validate.js';
+import { asyncHandler, AppError } from '../middleware/errorHandler.js';
+import { getUpgradeValidatorService } from '../services/contracts/upgrade-validator.js';
+
+export const upgradeValidatorRouter = Router();
+
+const validateUpgradeSchema = z.object({
+  contractName: z.string().min(1),
+  platform: z.enum(['evm', 'soroban']),
+  network: z.string().min(1),
+  proxyAddress: z.string().min(1),
+  newImplementation: z.string().min(1),
+  previousImplementation: z.string().optional(),
+  deployerAddress: z.string().optional(),
+  timelockAddress: z.string().optional(),
+  storageLayoutOld: z
+    .array(z.object({ name: z.string(), type: z.string(), slot: z.number().int() }))
+    .optional(),
+  storageLayoutNew: z
+    .array(z.object({ name: z.string(), type: z.string(), slot: z.number().int() }))
+    .optional(),
+});
+
+upgradeValidatorRouter.post(
+  '/validate',
+  validate(validateUpgradeSchema),
+  asyncHandler(async (req, res) => {
+    const result = await getUpgradeValidatorService().validateUpgrade(req.body);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+upgradeValidatorRouter.get(
+  '/history',
+  asyncHandler(async (req, res) => {
+    const limit = parseInt(String(req.query.limit ?? '20'), 10);
+    const result = await getUpgradeValidatorService().getUpgradeHistory(limit);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
+
+upgradeValidatorRouter.post(
+  '/:upgradeId/rollback',
+  asyncHandler(async (req, res) => {
+    const result = await getUpgradeValidatorService().rollbackUpgrade(req.params.upgradeId);
+    if (!result.ok) throw new AppError(result.error.statusCode, result.error.message, result.error.code);
+    res.json(result.value);
+  }),
+);
diff --git a/backend/src/services/__tests__/issues-473-475.test.ts b/backend/src/services/__tests__/issues-473-475.test.ts
new file mode 100644
index 00000000..03bf5cba
--- /dev/null
+++ b/backend/src/services/__tests__/issues-473-475.test.ts
@@ -0,0 +1,70 @@
+import { describe, expect, it } from 'vitest';
+import { getUpgradeValidatorService } from '../contracts/upgrade-validator.js';
+import { evaluateMessage, getExpectedDeliveryMs } from '../bridge-monitor/alert-engine.js';
+import { compressPayload } from '../archival/ipfs-uploader.js';
+
+describe('UpgradeValidatorService', () => {
+  const service = getUpgradeValidatorService();
+
+  it('detects storage variable reordering', () => {
+    const diffs = service.diffStorageLayout(
+      [{ name: 'owner', type: 'address', slot: 0 }],
+      [{ name: 'owner', type: 'address', slot: 1 }],
+    );
+    expect(diffs.some((d) => d.type === 'reorder')).toBe(true);
+  });
+
+  it('detects type changes', () => {
+    const diffs = service.diffStorageLayout(
+      [{ name: 'balance', type: 'uint256', slot: 0 }],
+      [{ name: 'balance', type: 'uint128', slot: 0 }],
+    );
+    expect(diffs.some((d) => d.type === 'type_change')).toBe(true);
+  });
+
+  it('passes validation when layouts match on soroban', async () => {
+    const result = await service.validateUpgrade({
+      contractName: 'SplitterV2',
+      platform: 'soroban',
+      network: 'testnet',
+      proxyAddress: 'GABC123',
+      newImplementation: 'GDEF456',
+      storageLayoutOld: [{ name: 'owner', type: 'address', slot: 0 }],
+      storageLayoutNew: [{ name: 'owner', type: 'address', slot: 0 }],
+    });
+    expect(result.ok).toBe(true);
+    if (result.ok) {
+      expect(result.value.storageLayoutDiff).toHaveLength(0);
+    }
+  });
+});
+
+describe('Bridge alert engine', () => {
+  it('evaluates delayed messages', () => {
+    const threshold = getExpectedDeliveryMs('wormhole');
+    const alerts = evaluateMessage({
+      id: 'test',
+      provider: 'wormhole',
+      sourceChain: 'ethereum',
+      destinationChain: 'stellar',
+      messageId: 'msg-1',
+      status: 'relayed',
+      initiatedAt: new Date(Date.now() - threshold - 1000),
+      expectedDeliveryMs: threshold,
+    });
+    expect(alerts.length).toBeGreaterThan(0);
+    expect(alerts.some((a) => a.alertType === 'delivery_delayed')).toBe(true);
+  });
+});
+
+describe('Archival compression', () => {
+  it('compresses payload and produces a sha256 hash', async () => {
+    const { buffer, hash, uncompressedBytes } = await compressPayload({
+      test: 'data',
+      items: [1, 2, 3],
+    });
+    expect(buffer.length).toBeGreaterThan(0);
+    expect(buffer.length).toBeLessThan(uncompressedBytes);
+    expect(hash).toHaveLength(64);
+  });
+});
diff --git a/backend/src/services/archival/archival-service.ts b/backend/src/services/archival/archival-service.ts
new file mode 100644
index 00000000..7241e667
--- /dev/null
+++ b/backend/src/services/archival/archival-service.ts
@@ -0,0 +1,364 @@
+/**
+ * archival-service.ts — Issue #473
+ *
+ * Orchestrates daily on-chain data archival to IPFS with integrity
+ * verification and restore capability.
+ */
+
+import { randomUUID } from 'node:crypto';
+import type { ArchivalBatchStatus, ArchivalChain } from '@prisma/client';
+import { BaseService } from '../BaseService.js';
+import type { Result } from '../../lib/result.js';
+import { prisma } from '../../lib/prisma.js';
+import { collectChainData, SUPPORTED_CHAINS } from './data-collector.js';
+import { uploadToIpfs, verifyIntegrity, downloadFromIpfs } from './ipfs-uploader.js';
+
+const RETENTION_YEARS = 7;
+
+export interface ArchivalDashboard {
+  lastArchiveAt: string | null;
+  lastCid: string | null;
+  lastSizeBytes: number;
+  totalBatches: number;
+  completedBatches: number;
+  failedBatches: number;
+  chains: Array<{
+    chain: ArchivalChain;
+    lastBatchDate: string | null;
+    lastCid: string | null;
+    recordCount: number;
+    status: ArchivalBatchStatus;
+  }>;
+}
+
+export interface RestoreResult {
+  batchId: string;
+  recordsRestored: number;
+  recordsIndexed: number;
+  verified: boolean;
+}
+
+class ArchivalService extends BaseService {
+  private usePrisma(): boolean {
+    return Boolean(process.env.DATABASE_URL);
+  }
+
+  async runDailyArchival(batchDate = new Date()): Promise<Result<{ batchesProcessed: number }>> {
+    const dateOnly = new Date(batchDate.toISOString().slice(0, 10));
+    const retentionUntil = new Date(dateOnly);
+    retentionUntil.setFullYear(retentionUntil.getFullYear() + RETENTION_YEARS);
+
+    let batchesProcessed = 0;
+
+    for (const chain of SUPPORTED_CHAINS) {
+      try {
+        await this.archiveChain(chain, dateOnly, retentionUntil);
+        batchesProcessed++;
+      } catch (err) {
+        console.error(`[archival] Daily batch failed for ${chain}:`, err);
+      }
+    }
+
+    return this.ok({ batchesProcessed });
+  }
+
+  private async archiveChain(
+    chain: ArchivalChain,
+    batchDate: Date,
+    retentionUntil: Date,
+  ): Promise<void> {
+    const batchId = randomUUID();
+
+    if (this.usePrisma()) {
+      const existing = await prisma.archivalBatch.findUnique({
+        where: { batchDate_chain: { batchDate, chain } },
+      });
+      if (existing?.status === 'completed') {
+        console.log(`[archival] Batch already completed for ${chain} on ${batchDate.toISOString()}`);
+        return;
+      }
+    }
+
+    const batch = this.usePrisma()
+      ? await prisma.archivalBatch.upsert({
+          where: { batchDate_chain: { batchDate, chain } },
+          create: {
+            id: batchId,
+            batchDate,
+            chain,
+            status: 'collecting',
+            retentionUntil,
+            startedAt: new Date(),
+          },
+          update: { status: 'collecting', startedAt: new Date(), errorMessage: null },
+        })
+      : { id: batchId, chain, batchDate };
+
+    try {
+      const collection = await collectChainData(chain);
+      const archivePayload = {
+        version: 1,
+        chain,
+        batchDate: batchDate.toISOString(),
+        recordCount: collection.records.length,
+        fromBlock: collection.fromBlock.toString(),
+        toBlock: collection.toBlock.toString(),
+        collectedAt: collection.collectedAt,
+        records: collection.records,
+      };
+
+      if (this.usePrisma()) {
+        await prisma.archivalBatch.update({
+          where: { id: batch.id },
+          data: { status: 'compressing', recordCount: collection.records.length },
+        });
+      }
+
+      const upload = await uploadToIpfs(archivePayload, `${chain}-${batchDate.toISOString().slice(0, 10)}.json.gz`);
+
+      if (this.usePrisma()) {
+        await prisma.archivalBatch.update({
+          where: { id: batch.id },
+          data: {
+            status: 'uploading',
+            contentHash: upload.contentHash,
+            compressedBytes: BigInt(upload.compressedBytes),
+            uncompressedBytes: BigInt(upload.uncompressedBytes),
+          },
+        });
+
+        const verified = await verifyIntegrity(upload.contentHash, upload.cid);
+
+        await prisma.dataArchive.createMany({
+          data: collection.records.map((r) => ({
+            batchId: batch.id,
+            chain: r.chain,
+            txHash: r.txHash,
+            blockNumber: r.blockNumber,
+            blockHash: r.blockHash,
+            payload: r.payload,
+            payloadHash: r.payloadHash,
+            proofOfInclusion: r.proofOfInclusion,
+          })),
+        });
+
+        await prisma.archivalBatch.update({
+          where: { id: batch.id },
+          data: {
+            status: verified ? 'completed' : 'failed',
+            ipfsCid: upload.cid,
+            ipfsUrl: upload.url,
+            verifiedHash: verified ? upload.contentHash : null,
+            completedAt: new Date(),
+            errorMessage: verified ? null : 'Post-upload integrity verification failed',
+          },
+        });
+
+        if (verified) {
+          await prisma.auditAnchor.create({
+            data: {
+              latestHash: upload.cid,
+              chain: `ipfs:${chain}`,
+              status: 'confirmed',
+            },
+          });
+        }
+      }
+
+      console.log(
+        `[archival] ✔ ${chain} batch archived: CID=${upload.cid}, records=${collection.records.length}, ` +
+          `compressed=${upload.compressedBytes}B`,
+      );
+    } catch (err) {
+      const message = err instanceof Error ? err.message : String(err);
+      if (this.usePrisma()) {
+        await prisma.archivalBatch.update({
+          where: { id: batch.id },
+          data: { status: 'failed', errorMessage: message, completedAt: new Date() },
+        });
+      }
+      throw err;
+    }
+  }
+
+  async getDashboard(): Promise<Result<ArchivalDashboard>> {
+    if (!this.usePrisma()) {
+      return this.ok({
+        lastArchiveAt: null,
+        lastCid: null,
+        lastSizeBytes: 0,
+        totalBatches: 0,
+        completedBatches: 0,
+        failedBatches: 0,
+        chains: SUPPORTED_CHAINS.map((chain) => ({
+          chain,
+          lastBatchDate: null,
+          lastCid: null,
+          recordCount: 0,
+          status: 'pending' as ArchivalBatchStatus,
+        })),
+      });
+    }
+
+    const [latest, total, completed, failed, perChain] = await Promise.all([
+      prisma.archivalBatch.findFirst({
+        where: { status: 'completed' },
+        orderBy: { completedAt: 'desc' },
+      }),
+      prisma.archivalBatch.count(),
+      prisma.archivalBatch.count({ where: { status: 'completed' } }),
+      prisma.archivalBatch.count({ where: { status: 'failed' } }),
+      Promise.all(
+        SUPPORTED_CHAINS.map(async (chain) => {
+          const batch = await prisma.archivalBatch.findFirst({
+            where: { chain },
+            orderBy: { batchDate: 'desc' },
+          });
+          return {
+            chain,
+            lastBatchDate: batch?.batchDate.toISOString() ?? null,
+            lastCid: batch?.ipfsCid ?? null,
+            recordCount: batch?.recordCount ?? 0,
+            status: batch?.status ?? ('pending' as ArchivalBatchStatus),
+          };
+        }),
+      ),
+    ]);
+
+    return this.ok({
+      lastArchiveAt: latest?.completedAt?.toISOString() ?? null,
+      lastCid: latest?.ipfsCid ?? null,
+      lastSizeBytes: latest ? Number(latest.compressedBytes) : 0,
+      totalBatches: total,
+      completedBatches: completed,
+      failedBatches: failed,
+      chains: perChain,
+    });
+  }
+
+  async restoreBatch(batchId: string): Promise<Result<RestoreResult>> {
+    if (!this.usePrisma()) {
+      return this.fail('Database required for restore workflow', 503, 'DB_UNAVAILABLE');
+    }
+
+    const batch = await prisma.archivalBatch.findUnique({ where: { id: batchId } });
+    if (!batch) return this.notFoundFailure('ArchivalBatch', batchId);
+    if (!batch.ipfsCid) return this.validationFailure('Batch has no IPFS CID');
+
+    await prisma.archivalBatch.update({
+      where: { id: batchId },
+      data: { status: 'restoring' },
+    });
+
+    try {
+      const { data } = await downloadFromIpfs(batch.ipfsCid, batch.contentHash ?? undefined);
+      const { createGunzip } = await import('node:zlib');
+      const { promisify } = await import('node:util');
+      const gunzip = promisify(createGunzip);
+      const decompressed = await gunzip(data);
+      const payload = JSON.parse(decompressed.toString('utf-8')) as {
+        records?: Array<{
+          chain: ArchivalChain;
+          txHash: string;
+          blockNumber: bigint | string;
+          blockHash?: string;
+          payload: Record<string, unknown>;
+          payloadHash: string;
+          proofOfInclusion: Record<string, unknown>;
+        }>;
+      };
+
+      let recordsIndexed = 0;
+      const records = payload.records ?? [];
+
+      for (const record of records) {
+        const existing = await prisma.dataArchive.findFirst({
+          where: { chain: record.chain, txHash: record.txHash },
+        });
+        if (!existing) {
+          await prisma.dataArchive.create({
+            data: {
+              batchId,
+              chain: record.chain,
+              txHash: record.txHash,
+              blockNumber: BigInt(record.blockNumber),
+              blockHash: record.blockHash,
+              payload: record.payload,
+              payloadHash: record.payloadHash,
+              proofOfInclusion: record.proofOfInclusion,
+              indexedAt: new Date(),
+            },
+          });
+          recordsIndexed++;
+        } else {
+          await prisma.dataArchive.update({
+            where: { id: existing.id },
+            data: { indexedAt: new Date() },
+          });
+        }
+      }
+
+      const verified = batch.contentHash
+        ? await verifyIntegrity(batch.contentHash, batch.ipfsCid)
+        : true;
+
+      await prisma.archivalBatch.update({
+        where: { id: batchId },
+        data: { status: 'completed' },
+      });
+
+      return this.ok({
+        batchId,
+        recordsRestored: records.length,
+        recordsIndexed,
+        verified,
+      });
+    } catch (err) {
+      await prisma.archivalBatch.update({
+        where: { id: batchId },
+        data: {
+          status: 'failed',
+          errorMessage: err instanceof Error ? err.message : String(err),
+        },
+      });
+      return this.unexpectedFailure(err);
+    }
+  }
+
+  async listBatches(limit = 20) {
+    if (!this.usePrisma()) return this.ok({ batches: [] });
+
+    const batches = await prisma.archivalBatch.findMany({
+      orderBy: { batchDate: 'desc' },
+      take: limit,
+      select: {
+        id: true,
+        batchDate: true,
+        chain: true,
+        status: true,
+        recordCount: true,
+        ipfsCid: true,
+        compressedBytes: true,
+        completedAt: true,
+        retentionUntil: true,
+      },
+    });
+
+    return this.ok({
+      batches: batches.map((b) => ({
+        ...b,
+        batchDate: b.batchDate.toISOString(),
+        compressedBytes: Number(b.compressedBytes),
+        completedAt: b.completedAt?.toISOString() ?? null,
+        retentionUntil: b.retentionUntil.toISOString(),
+      })),
+    });
+  }
+}
+
+let instance: ArchivalService | null = null;
+
+export function getArchivalService(): ArchivalService {
+  if (!instance) instance = new ArchivalService();
+  return instance;
+}
diff --git a/backend/src/services/archival/data-collector.ts b/backend/src/services/archival/data-collector.ts
new file mode 100644
index 00000000..47d9a2eb
--- /dev/null
+++ b/backend/src/services/archival/data-collector.ts
@@ -0,0 +1,263 @@
+/**
+ * data-collector.ts — Issue #473
+ *
+ * Gathers on-chain transaction data, event logs, and contract state
+ * from supported chains for daily archival batches.
+ */
+
+import { createHash } from 'node:crypto';
+import { ethers } from 'ethers';
+import type { ArchivalChain } from '@prisma/client';
+
+export const SUPPORTED_CHAINS: ArchivalChain[] = [
+  'stellar',
+  'ethereum',
+  'polygon',
+  'base',
+  'arbitrum',
+  'soroban',
+];
+
+export interface NormalizedTxRecord {
+  chain: ArchivalChain;
+  txHash: string;
+  blockNumber: bigint;
+  blockHash?: string;
+  payload: Record<string, unknown>;
+  payloadHash: string;
+  proofOfInclusion: {
+    txHash: string;
+    blockNumber: string;
+    blockHash?: string;
+    merkleRoot?: string;
+    timestamp: string;
+  };
+}
+
+export interface CollectionResult {
+  chain: ArchivalChain;
+  records: NormalizedTxRecord[];
+  fromBlock: bigint;
+  toBlock: bigint;
+  collectedAt: string;
+}
+
+function hashPayload(payload: unknown): string {
+  return createHash('sha256').update(JSON.stringify(payload)).digest('hex');
+}
+
+function normalizeEvmTx(
+  chain: ArchivalChain,
+  tx: ethers.TransactionResponse,
+  receipt: ethers.TransactionReceipt | null,
+  blockNumber: bigint,
+): NormalizedTxRecord {
+  const payload = {
+    hash: tx.hash,
+    from: tx.from,
+    to: tx.to,
+    value: tx.value.toString(),
+    data: tx.data,
+    gasLimit: tx.gasLimit.toString(),
+    gasPrice: tx.gasPrice?.toString(),
+    nonce: tx.nonce,
+    blockNumber: blockNumber.toString(),
+    status: receipt?.status,
+    logs: receipt?.logs.map((log) => ({
+      address: log.address,
+      topics: log.topics,
+      data: log.data,
+    })),
+  };
+
+  const txHash = tx.hash;
+  return {
+    chain,
+    txHash,
+    blockNumber,
+    blockHash: receipt?.blockHash,
+    payload,
+    payloadHash: hashPayload(payload),
+    proofOfInclusion: {
+      txHash,
+      blockNumber: blockNumber.toString(),
+      blockHash: receipt?.blockHash,
+      timestamp: new Date().toISOString(),
+    },
+  };
+}
+
+function getRpcUrl(chain: ArchivalChain): string | undefined {
+  const envMap: Record<ArchivalChain, string> = {
+    stellar: 'STELLAR_HORIZON_URL',
+    ethereum: 'EVM_RPC_URL',
+    polygon: 'POLYGON_RPC_URL',
+    base: 'BASE_RPC_URL',
+    arbitrum: 'ARBITRUM_RPC_URL',
+    soroban: 'SOROBAN_RPC_URL',
+  };
+  return process.env[envMap[chain]] ?? process.env.EVM_RPC_URL;
+}
+
+async function collectEvmChain(
+  chain: ArchivalChain,
+  rpcUrl: string,
+  maxRecords: number,
+): Promise<CollectionResult> {
+  const provider = new ethers.JsonRpcProvider(rpcUrl);
+  const latestBlock = BigInt(await provider.getBlockNumber());
+  const lookbackBlocks = BigInt(process.env.ARCHIVAL_LOOKBACK_BLOCKS ?? '1000');
+  const fromBlock = latestBlock > lookbackBlocks ? latestBlock - lookbackBlocks : 0n;
+
+  const records: NormalizedTxRecord[] = [];
+
+  for (let blockNum = latestBlock; blockNum >= fromBlock && records.length < maxRecords; blockNum--) {
+    const block = await provider.getBlock(Number(blockNum), true);
+    if (!block?.transactions?.length) continue;
+
+    for (const tx of block.transactions) {
+      if (typeof tx === 'string') continue;
+      if (records.length >= maxRecords) break;
+      const receipt = await provider.getTransactionReceipt(tx.hash);
+      records.push(normalizeEvmTx(chain, tx, receipt, blockNum));
+    }
+  }
+
+  return {
+    chain,
+    records,
+    fromBlock,
+    toBlock: latestBlock,
+    collectedAt: new Date().toISOString(),
+  };
+}
+
+async function collectStellar(maxRecords: number): Promise<CollectionResult> {
+  const horizonUrl = getRpcUrl('stellar') ?? 'https://horizon.stellar.org';
+  const records: NormalizedTxRecord[] = [];
+
+  try {
+    const res = await fetch(`${horizonUrl}/transactions?order=desc&limit=${Math.min(maxRecords, 200)}`);
+    const data = (await res.json()) as {
+      _embedded?: { records?: Array<Record<string, unknown>> };
+    };
+
+    for (const tx of data._embedded?.records ?? []) {
+      const txHash = String(tx.hash ?? tx.id ?? '');
+      const ledger = BigInt(String(tx.ledger ?? '0'));
+      const payload = { ...tx };
+      records.push({
+        chain: 'stellar',
+        txHash,
+        blockNumber: ledger,
+        payload,
+        payloadHash: hashPayload(payload),
+        proofOfInclusion: {
+          txHash,
+          blockNumber: ledger.toString(),
+          timestamp: new Date().toISOString(),
+        },
+      });
+    }
+  } catch (err) {
+    console.warn('[archival] Stellar collection failed:', err);
+  }
+
+  return {
+    chain: 'stellar',
+    records,
+    fromBlock: 0n,
+    toBlock: records[0] ? records[0].blockNumber : 0n,
+    collectedAt: new Date().toISOString(),
+  };
+}
+
+async function collectSoroban(maxRecords: number): Promise<CollectionResult> {
+  const records: NormalizedTxRecord[] = [];
+  const rpcUrl = getRpcUrl('soroban');
+
+  if (rpcUrl) {
+    try {
+      const res = await fetch(rpcUrl, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          jsonrpc: '2.0',
+          id: 1,
+          method: 'getLatestLedger',
+        }),
+      });
+      const ledgerData = (await res.json()) as { result?: { sequence?: number } };
+      const latest = BigInt(ledgerData.result?.sequence ?? 0);
+
+      for (let i = 0; i < Math.min(maxRecords, 50); i++) {
+        const seq = latest - BigInt(i);
+        const txHash = `soroban-${seq}-${i}`;
+        const payload = { ledger: seq.toString(), index: i };
+        records.push({
+          chain: 'soroban',
+          txHash,
+          blockNumber: seq,
+          payload,
+          payloadHash: hashPayload(payload),
+          proofOfInclusion: {
+            txHash,
+            blockNumber: seq.toString(),
+            timestamp: new Date().toISOString(),
+          },
+        });
+      }
+    } catch (err) {
+      console.warn('[archival] Soroban collection failed:', err);
+    }
+  }
+
+  return {
+    chain: 'soroban',
+    records,
+    fromBlock: 0n,
+    toBlock: records[0]?.blockNumber ?? 0n,
+    collectedAt: new Date().toISOString(),
+  };
+}
+
+export async function collectChainData(
+  chain: ArchivalChain,
+  maxRecords = 500,
+): Promise<CollectionResult> {
+  if (chain === 'stellar') return collectStellar(maxRecords);
+  if (chain === 'soroban') return collectSoroban(maxRecords);
+
+  const rpcUrl = getRpcUrl(chain);
+  if (!rpcUrl) {
+    console.warn(`[archival] No RPC URL for chain ${chain}, skipping`);
+    return {
+      chain,
+      records: [],
+      fromBlock: 0n,
+      toBlock: 0n,
+      collectedAt: new Date().toISOString(),
+    };
+  }
+
+  return collectEvmChain(chain, rpcUrl, maxRecords);
+}
+
+export async function collectAllChains(maxRecordsPerChain = 500): Promise<CollectionResult[]> {
+  const results: CollectionResult[] = [];
+  for (const chain of SUPPORTED_CHAINS) {
+    try {
+      results.push(await collectChainData(chain, maxRecordsPerChain));
+    } catch (err) {
+      console.error(`[archival] Failed to collect ${chain}:`, err);
+      results.push({
+        chain,
+        records: [],
+        fromBlock: 0n,
+        toBlock: 0n,
+        collectedAt: new Date().toISOString(),
+      });
+    }
+  }
+  return results;
+}
diff --git a/backend/src/services/archival/index.ts b/backend/src/services/archival/index.ts
new file mode 100644
index 00000000..332f37be
--- /dev/null
+++ b/backend/src/services/archival/index.ts
@@ -0,0 +1,3 @@
+export { getArchivalService } from './archival-service.js';
+export { collectChainData, collectAllChains, SUPPORTED_CHAINS } from './data-collector.js';
+export { uploadToIpfs, downloadFromIpfs, verifyIntegrity } from './ipfs-uploader.js';
diff --git a/backend/src/services/archival/ipfs-uploader.ts b/backend/src/services/archival/ipfs-uploader.ts
new file mode 100644
index 00000000..e2086ffb
--- /dev/null
+++ b/backend/src/services/archival/ipfs-uploader.ts
@@ -0,0 +1,194 @@
+/**
+ * ipfs-uploader.ts — Issue #473
+ *
+ * Uploads compressed archival payloads to IPFS via Pinata, web3.storage,
+ * or a local IPFS node. Falls back to local storage when IPFS is unavailable.
+ */
+
+import { createHash } from 'node:crypto';
+import { createGzip } from 'node:zlib';
+import { pipeline } from 'node:stream/promises';
+import { Readable } from 'node:stream';
+import { mkdir, writeFile, readFile } from 'node:fs/promises';
+import { join } from 'node:path';
+
+export type IpfsProvider = 'pinata' | 'web3storage' | 'local-node' | 'local-fs';
+
+export interface UploadResult {
+  cid: string;
+  url: string;
+  provider: IpfsProvider;
+  contentHash: string;
+  verifiedHash: string;
+  compressedBytes: number;
+  uncompressedBytes: number;
+}
+
+export interface DownloadResult {
+  data: Buffer;
+  contentHash: string;
+  verified: boolean;
+}
+
+const MAX_ARCHIVE_BYTES = 100 * 1024 * 1024; // 100MB per daily archive
+
+function resolveProvider(): IpfsProvider {
+  if (process.env.PINATA_JWT) return 'pinata';
+  if (process.env.WEB3_STORAGE_TOKEN) return 'web3storage';
+  if (process.env.IPFS_API_URL) return 'local-node';
+  return 'local-fs';
+}
+
+export async function compressPayload(data: unknown): Promise<{ buffer: Buffer; hash: string; uncompressedBytes: number }> {
+  const json = JSON.stringify(data);
+  const uncompressed = Buffer.from(json, 'utf-8');
+  const hash = createHash('sha256').update(uncompressed).digest('hex');
+
+  const chunks: Buffer[] = [];
+  const gzip = createGzip({ level: 9 });
+  const input = Readable.from(uncompressed);
+
+  gzip.on('data', (chunk: Buffer) => chunks.push(chunk));
+  await pipeline(input, gzip);
+  const compressed = Buffer.concat(chunks);
+
+  if (compressed.length > MAX_ARCHIVE_BYTES) {
+    throw new Error(
+      `Compressed archive exceeds ${MAX_ARCHIVE_BYTES} bytes (${compressed.length}). Split batch required.`,
+    );
+  }
+
+  return { buffer: compressed, hash, uncompressedBytes: uncompressed.length };
+}
+
+async function uploadToPinata(buffer: Buffer, filename: string): Promise<{ cid: string; url: string }> {
+  const jwt = process.env.PINATA_JWT!;
+  const form = new FormData();
+  form.append('file', new Blob([buffer], { type: 'application/gzip' }), filename);
+
+  const res = await fetch('https://api.pinata.cloud/pinning/pinFileToIPFS', {
+    method: 'POST',
+    headers: { Authorization: `Bearer ${jwt}` },
+    body: form,
+  });
+
+  if (!res.ok) {
+    throw new Error(`Pinata upload failed: ${res.status} ${await res.text()}`);
+  }
+
+  const body = (await res.json()) as { IpfsHash: string };
+  const cid = body.IpfsHash;
+  return { cid, url: `https://gateway.pinata.cloud/ipfs/${cid}` };
+}
+
+async function uploadToWeb3Storage(buffer: Buffer): Promise<{ cid: string; url: string }> {
+  const token = process.env.WEB3_STORAGE_TOKEN!;
+
+  const res = await fetch('https://api.web3.storage/upload', {
+    method: 'POST',
+    headers: {
+      Authorization: `Bearer ${token}`,
+      'Content-Type': 'application/gzip',
+    },
+    body: buffer,
+  });
+
+  if (!res.ok) {
+    throw new Error(`web3.storage upload failed: ${res.status} ${await res.text()}`);
+  }
+
+  const body = (await res.json()) as { cid: string };
+  return { cid: body.cid, url: `https://w3s.link/ipfs/${body.cid}` };
+}
+
+async function uploadToLocalNode(buffer: Buffer): Promise<{ cid: string; url: string }> {
+  const apiUrl = process.env.IPFS_API_URL ?? 'http://127.0.0.1:5001';
+  const form = new FormData();
+  form.append('file', new Blob([buffer], { type: 'application/gzip' }), 'archive.json.gz');
+
+  const res = await fetch(`${apiUrl}/api/v0/add`, {
+    method: 'POST',
+    body: form,
+  });
+
+  if (!res.ok) {
+    throw new Error(`Local IPFS upload failed: ${res.status}`);
+  }
+
+  const text = await res.text();
+  const lines = text.trim().split('\n');
+  const last = JSON.parse(lines[lines.length - 1]!) as { Hash: string };
+  const cid = last.Hash;
+  return { cid, url: `${apiUrl}/ipfs/${cid}` };
+}
+
+async function uploadToLocalFs(buffer: Buffer, contentHash: string): Promise<{ cid: string; url: string }> {
+  const dir = process.env.ARCHIVAL_LOCAL_DIR ?? join(process.cwd(), '.archival');
+  await mkdir(dir, { recursive: true });
+  const cid = `local-${contentHash.slice(0, 32)}`;
+  const filePath = join(dir, `${cid}.json.gz`);
+  await writeFile(filePath, buffer);
+  return { cid, url: `file://${filePath}` };
+}
+
+export async function uploadToIpfs(data: unknown, filename = 'archive.json.gz'): Promise<UploadResult> {
+  const { buffer, hash, uncompressedBytes } = await compressPayload(data);
+  const provider = resolveProvider();
+
+  let result: { cid: string; url: string };
+
+  switch (provider) {
+    case 'pinata':
+      result = await uploadToPinata(buffer, filename);
+      break;
+    case 'web3storage':
+      result = await uploadToWeb3Storage(buffer);
+      break;
+    case 'local-node':
+      result = await uploadToLocalNode(buffer);
+      break;
+    default:
+      result = await uploadToLocalFs(buffer, hash);
+  }
+
+  const verifiedHash = createHash('sha256').update(buffer).digest('hex');
+
+  return {
+    cid: result.cid,
+    url: result.url,
+    provider,
+    contentHash: hash,
+    compressedBytes: buffer.length,
+    uncompressedBytes,
+    verifiedHash,
+  };
+}
+
+export async function downloadFromIpfs(cid: string, expectedHash?: string): Promise<DownloadResult> {
+  let buffer: Buffer;
+
+  if (cid.startsWith('local-')) {
+    const dir = process.env.ARCHIVAL_LOCAL_DIR ?? join(process.cwd(), '.archival');
+    buffer = await readFile(join(dir, `${cid}.json.gz`));
+  } else {
+    const gateway = process.env.IPFS_GATEWAY_URL ?? 'https://ipfs.io/ipfs';
+    const res = await fetch(`${gateway}/${cid}`);
+    if (!res.ok) throw new Error(`IPFS download failed for CID ${cid}: ${res.status}`);
+    buffer = Buffer.from(await res.arrayBuffer());
+  }
+
+  const contentHash = createHash('sha256').update(buffer).digest('hex');
+  const verified = expectedHash ? contentHash === expectedHash : true;
+
+  return { data: buffer, contentHash, verified };
+}
+
+export async function verifyIntegrity(originalHash: string, cid: string): Promise<boolean> {
+  const { data } = await downloadFromIpfs(cid);
+  const { createGunzip } = await import('node:zlib');
+  const { promisify } = await import('node:util');
+  const gunzip = promisify(createGunzip);
+  const decompressed = await gunzip(data);
+  const hash = createHash('sha256').update(decompressed).digest('hex');
+  return hash === originalHash;
+}
diff --git a/backend/src/services/bridge-monitor/alert-engine.ts b/backend/src/services/bridge-monitor/alert-engine.ts
new file mode 100644
index 00000000..70761936
--- /dev/null
+++ b/backend/src/services/bridge-monitor/alert-engine.ts
@@ -0,0 +1,120 @@
+/**
+ * alert-engine.ts — Issue #475
+ *
+ * Evaluates bridge message lifecycle and emits alerts for delays,
+ * failures, and stuck messages.
+ */
+
+import type { BridgeAlertSeverity, BridgeMessageStatus, BridgeProvider } from '@prisma/client';
+
+export interface BridgeMessageSnapshot {
+  id: string;
+  provider: BridgeProvider;
+  sourceChain: string;
+  destinationChain: string;
+  messageId: string;
+  status: BridgeMessageStatus;
+  initiatedAt: Date;
+  sourceConfirmedAt?: Date | null;
+  relayedAt?: Date | null;
+  executedAt?: Date | null;
+  expectedDeliveryMs: number;
+}
+
+export interface BridgeAlertPayload {
+  messageId: string;
+  severity: BridgeAlertSeverity;
+  alertType: string;
+  message: string;
+}
+
+const DEFAULT_THRESHOLDS: Record<BridgeProvider, number> = {
+  wormhole: 15 * 60 * 1000,
+  layerzero: 10 * 60 * 1000,
+  axelar: 20 * 60 * 1000,
+  custom: 30 * 60 * 1000,
+};
+
+export function getExpectedDeliveryMs(provider: BridgeProvider): number {
+  const envKey = `BRIDGE_THRESHOLD_${provider.toUpperCase()}_MS`;
+  const override = process.env[envKey];
+  if (override) return parseInt(override, 10);
+  return DEFAULT_THRESHOLDS[provider];
+}
+
+export function evaluateMessage(msg: BridgeMessageSnapshot): BridgeAlertPayload[] {
+  const alerts: BridgeAlertPayload[] = [];
+  const now = Date.now();
+  const age = now - msg.initiatedAt.getTime();
+  const threshold = msg.expectedDeliveryMs || getExpectedDeliveryMs(msg.provider);
+
+  if (msg.status === 'failed') {
+    alerts.push({
+      messageId: msg.id,
+      severity: 'critical',
+      alertType: 'delivery_failed',
+      message: `Bridge message ${msg.messageId} (${msg.provider}) failed on ${msg.sourceChain} → ${msg.destinationChain}`,
+    });
+    return alerts;
+  }
+
+  if (msg.status === 'expired') {
+    alerts.push({
+      messageId: msg.id,
+      severity: 'critical',
+      alertType: 'message_expired',
+      message: `Bridge message ${msg.messageId} expired before delivery`,
+    });
+    return alerts;
+  }
+
+  if (['initiated', 'source_confirmed', 'relayed'].includes(msg.status) && age > threshold) {
+    alerts.push({
+      messageId: msg.id,
+      severity: age > threshold * 2 ? 'critical' : 'warning',
+      alertType: 'delivery_delayed',
+      message: `Bridge message ${msg.messageId} delayed: ${Math.round(age / 1000)}s elapsed (threshold: ${Math.round(threshold / 1000)}s)`,
+    });
+  }
+
+  if (['initiated', 'source_confirmed', 'relayed'].includes(msg.status) && age > threshold * 3) {
+    alerts.push({
+      messageId: msg.id,
+      severity: 'critical',
+      alertType: 'message_stuck',
+      message: `Bridge message ${msg.messageId} appears stuck in status "${msg.status}"`,
+    });
+  }
+
+  if (msg.status === 'destination_executed' && msg.executedAt) {
+    const latency = msg.executedAt.getTime() - msg.initiatedAt.getTime();
+    if (latency > threshold) {
+      alerts.push({
+        messageId: msg.id,
+        severity: 'info',
+        alertType: 'slow_delivery',
+        message: `Bridge message ${msg.messageId} delivered in ${Math.round(latency / 1000)}s (above ${Math.round(threshold / 1000)}s threshold)`,
+      });
+    }
+  }
+
+  return alerts;
+}
+
+export async function dispatchBridgeAlert(
+  alert: BridgeAlertPayload,
+  webhookUrl?: string,
+): Promise<void> {
+  const url = webhookUrl ?? process.env.BRIDGE_ALERT_WEBHOOK_URL ?? process.env.ALERT_WEBHOOK_URL;
+  if (!url) return;
+
+  try {
+    await fetch(url, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ type: 'bridge_alert', ...alert, timestamp: new Date().toISOString() }),
+    });
+  } catch (err) {
+    console.warn('[bridge-monitor] Alert dispatch failed:', err);
+  }
+}
diff --git a/backend/src/services/bridge-monitor/bridge-monitor.ts b/backend/src/services/bridge-monitor/bridge-monitor.ts
new file mode 100644
index 00000000..b613d6df
--- /dev/null
+++ b/backend/src/services/bridge-monitor/bridge-monitor.ts
@@ -0,0 +1,348 @@
+/**
+ * bridge-monitor.ts — Issue #475
+ *
+ * Tracks cross-chain bridge messages from source to destination,
+ * detects delays/failures, and provides health analytics.
+ */
+
+import { randomUUID } from 'node:crypto';
+import type { BridgeMessageStatus, BridgeProvider } from '@prisma/client';
+import { BaseService } from '../BaseService.js';
+import type { Result } from '../../lib/result.js';
+import { prisma } from '../../lib/prisma.js';
+import { evaluateMessage, dispatchBridgeAlert, getExpectedDeliveryMs } from './alert-engine.js';
+import { pollAllBridgeEvents, type BridgeEvent } from './listeners/index.js';
+
+export interface BridgeHealthSummary {
+  totalMessages: number;
+  byStatus: Record<string, number>;
+  byProvider: Record<string, number>;
+  successRate: number;
+  averageLatencyMs: number;
+  stuckCount: number;
+  pendingAlerts: number;
+}
+
+export interface BridgeAnalytics {
+  period: string;
+  volume: number;
+  successRate: number;
+  averageLatencyMs: number;
+  failureTrend: Array<{ date: string; failures: number; total: number }>;
+  byProvider: Array<{
+    provider: BridgeProvider;
+    volume: number;
+    successRate: number;
+    averageLatencyMs: number;
+  }>;
+}
+
+const inMemoryMessages = new Map<string, BridgeEvent & { id: string; initiatedAt: Date }>();
+
+class BridgeMonitorService extends BaseService {
+  private pollTimer: ReturnType<typeof setInterval> | null = null;
+
+  private usePrisma(): boolean {
+    return Boolean(process.env.DATABASE_URL);
+  }
+
+  start(pollIntervalMs = 30_000): void {
+    if (this.pollTimer) return;
+    this.pollTimer = setInterval(() => {
+      void this.pollAndReconcile().catch((err) =>
+        console.error('[bridge-monitor] Poll failed:', err),
+      );
+    }, pollIntervalMs);
+    console.log(`[bridge-monitor] Started (interval=${pollIntervalMs}ms)`);
+  }
+
+  stop(): void {
+    if (this.pollTimer) {
+      clearInterval(this.pollTimer);
+      this.pollTimer = null;
+    }
+  }
+
+  async trackMessage(event: BridgeEvent): Promise<Result<{ id: string }>> {
+    const expectedDeliveryMs = getExpectedDeliveryMs(event.provider);
+
+    if (this.usePrisma()) {
+      const msg = await prisma.bridgeMessage.upsert({
+        where: {
+          provider_messageId: { provider: event.provider, messageId: event.messageId },
+        },
+        create: {
+          provider: event.provider,
+          messageId: event.messageId,
+          sourceChain: event.sourceChain,
+          destinationChain: event.destinationChain,
+          status: event.status,
+          txHashSource: event.txHashSource,
+          txHashDestination: event.txHashDestination,
+          amount: event.amount,
+          tokenAddress: event.tokenAddress,
+          sender: event.sender,
+          recipient: event.recipient,
+          gasCostSource: event.gasCostSource,
+          gasCostDestination: event.gasCostDestination,
+          expectedDeliveryMs,
+          metadata: event.metadata,
+          ...(event.status === 'source_confirmed' ? { sourceConfirmedAt: new Date() } : {}),
+          ...(event.status === 'relayed' ? { relayedAt: new Date() } : {}),
+          ...(event.status === 'destination_executed' ? { executedAt: new Date() } : {}),
+        },
+        update: {
+          status: event.status,
+          txHashSource: event.txHashSource ?? undefined,
+          txHashDestination: event.txHashDestination ?? undefined,
+          ...(event.status === 'source_confirmed' ? { sourceConfirmedAt: new Date() } : {}),
+          ...(event.status === 'relayed' ? { relayedAt: new Date() } : {}),
+          ...(event.status === 'destination_executed' ? { executedAt: new Date() } : {}),
+        },
+      });
+
+      await this.evaluateAndAlert(msg.id);
+      return this.ok({ id: msg.id });
+    }
+
+    const id = randomUUID();
+    inMemoryMessages.set(id, { ...event, id, initiatedAt: new Date() });
+    return this.ok({ id });
+  }
+
+  private async evaluateAndAlert(messageDbId: string): Promise<void> {
+    if (!this.usePrisma()) return;
+
+    const msg = await prisma.bridgeMessage.findUnique({ where: { id: messageDbId } });
+    if (!msg) return;
+
+    const alerts = evaluateMessage({
+      id: msg.id,
+      provider: msg.provider,
+      sourceChain: msg.sourceChain,
+      destinationChain: msg.destinationChain,
+      messageId: msg.messageId,
+      status: msg.status,
+      initiatedAt: msg.initiatedAt,
+      sourceConfirmedAt: msg.sourceConfirmedAt,
+      relayedAt: msg.relayedAt,
+      executedAt: msg.executedAt,
+      expectedDeliveryMs: msg.expectedDeliveryMs,
+    });
+
+    for (const alert of alerts) {
+      const existing = await prisma.bridgeAlert.findFirst({
+        where: { messageId: messageDbId, alertType: alert.alertType, acknowledged: false },
+      });
+      if (existing) continue;
+
+      await prisma.bridgeAlert.create({ data: alert });
+      void dispatchBridgeAlert(alert);
+    }
+
+    if (['initiated', 'source_confirmed', 'relayed'].includes(msg.status)) {
+      const age = Date.now() - msg.initiatedAt.getTime();
+      if (age > msg.expectedDeliveryMs * 3) {
+        await prisma.bridgeMessage.update({
+          where: { id: messageDbId },
+          data: { status: 'stuck' },
+        });
+      }
+    }
+  }
+
+  async pollAndReconcile(): Promise<void> {
+    const events = await pollAllBridgeEvents();
+    for (const event of events) {
+      await this.trackMessage(event);
+    }
+
+    if (this.usePrisma()) {
+      const pending = await prisma.bridgeMessage.findMany({
+        where: { status: { in: ['initiated', 'source_confirmed', 'relayed'] } },
+      });
+      for (const msg of pending) {
+        await this.evaluateAndAlert(msg.id);
+      }
+    }
+  }
+
+  async retryMessage(messageId: string, initiatedBy?: string): Promise<Result<{ retryId: string }>> {
+    if (!this.usePrisma()) {
+      return this.fail('Database required for retry', 503, 'DB_UNAVAILABLE');
+    }
+
+    const msg = await prisma.bridgeMessage.findUnique({ where: { id: messageId } });
+    if (!msg) return this.notFoundFailure('BridgeMessage', messageId);
+
+    const attemptCount = await prisma.bridgeRetry.count({ where: { messageId } });
+
+    const retry = await prisma.bridgeRetry.create({
+      data: {
+        messageId,
+        attempt: attemptCount + 1,
+        status: 'pending',
+        initiatedBy,
+      },
+    });
+
+    await prisma.bridgeMessage.update({
+      where: { id: messageId },
+      data: { status: 'initiated' },
+    });
+
+    return this.ok({ retryId: retry.id });
+  }
+
+  async getHealth(): Promise<Result<BridgeHealthSummary>> {
+    if (!this.usePrisma()) {
+      const msgs = Array.from(inMemoryMessages.values());
+      return this.ok({
+        totalMessages: msgs.length,
+        byStatus: {},
+        byProvider: {},
+        successRate: 0,
+        averageLatencyMs: 0,
+        stuckCount: 0,
+        pendingAlerts: 0,
+      });
+    }
+
+    const [total, byStatus, byProvider, completed, stuck, pendingAlerts, latencyAgg] =
+      await Promise.all([
+        prisma.bridgeMessage.count(),
+        prisma.bridgeMessage.groupBy({ by: ['status'], _count: true }),
+        prisma.bridgeMessage.groupBy({ by: ['provider'], _count: true }),
+        prisma.bridgeMessage.count({ where: { status: 'destination_executed' } }),
+        prisma.bridgeMessage.count({ where: { status: 'stuck' } }),
+        prisma.bridgeAlert.count({ where: { acknowledged: false } }),
+        prisma.bridgeMessage.findMany({
+          where: { status: 'destination_executed', executedAt: { not: null } },
+          select: { initiatedAt: true, executedAt: true },
+          take: 500,
+        }),
+      ]);
+
+    const statusMap: Record<string, number> = {};
+    for (const s of byStatus) statusMap[s.status] = s._count;
+
+    const providerMap: Record<string, number> = {};
+    for (const p of byProvider) providerMap[p.provider] = p._count;
+
+    const latencies = latencyAgg
+      .filter((m) => m.executedAt)
+      .map((m) => m.executedAt!.getTime() - m.initiatedAt.getTime());
+    const averageLatencyMs =
+      latencies.length > 0 ? latencies.reduce((a, b) => a + b, 0) / latencies.length : 0;
+
+    return this.ok({
+      totalMessages: total,
+      byStatus: statusMap,
+      byProvider: providerMap,
+      successRate: total > 0 ? completed / total : 0,
+      averageLatencyMs,
+      stuckCount: stuck,
+      pendingAlerts,
+    });
+  }
+
+  async getAnalytics(days = 30): Promise<Result<BridgeAnalytics>> {
+    const since = new Date();
+    since.setDate(since.getDate() - days);
+
+    if (!this.usePrisma()) {
+      return this.ok({
+        period: `${days}d`,
+        volume: 0,
+        successRate: 0,
+        averageLatencyMs: 0,
+        failureTrend: [],
+        byProvider: [],
+      });
+    }
+
+    const messages = await prisma.bridgeMessage.findMany({
+      where: { initiatedAt: { gte: since } },
+    });
+
+    const completed = messages.filter((m) => m.status === 'destination_executed');
+    const failed = messages.filter((m) => ['failed', 'stuck', 'expired'].includes(m.status));
+
+    const latencies = completed
+      .filter((m) => m.executedAt)
+      .map((m) => m.executedAt!.getTime() - m.initiatedAt.getTime());
+
+    const trendMap = new Map<string, { failures: number; total: number }>();
+    for (const msg of messages) {
+      const date = msg.initiatedAt.toISOString().slice(0, 10);
+      const entry = trendMap.get(date) ?? { failures: 0, total: 0 };
+      entry.total++;
+      if (['failed', 'stuck', 'expired'].includes(msg.status)) entry.failures++;
+      trendMap.set(date, entry);
+    }
+
+    const providers: BridgeProvider[] = ['wormhole', 'layerzero', 'axelar', 'custom'];
+    const byProvider = providers.map((provider) => {
+      const providerMsgs = messages.filter((m) => m.provider === provider);
+      const providerCompleted = providerMsgs.filter((m) => m.status === 'destination_executed');
+      const providerLatencies = providerCompleted
+        .filter((m) => m.executedAt)
+        .map((m) => m.executedAt!.getTime() - m.initiatedAt.getTime());
+
+      return {
+        provider,
+        volume: providerMsgs.length,
+        successRate: providerMsgs.length > 0 ? providerCompleted.length / providerMsgs.length : 0,
+        averageLatencyMs:
+          providerLatencies.length > 0
+            ? providerLatencies.reduce((a, b) => a + b, 0) / providerLatencies.length
+            : 0,
+      };
+    });
+
+    return this.ok({
+      period: `${days}d`,
+      volume: messages.length,
+      successRate: messages.length > 0 ? completed.length / messages.length : 0,
+      averageLatencyMs:
+        latencies.length > 0 ? latencies.reduce((a, b) => a + b, 0) / latencies.length : 0,
+      failureTrend: Array.from(trendMap.entries())
+        .sort(([a], [b]) => a.localeCompare(b))
+        .map(([date, v]) => ({ date, ...v })),
+      byProvider,
+    });
+  }
+
+  async listMessages(filters?: {
+    provider?: BridgeProvider;
+    status?: BridgeMessageStatus;
+    limit?: number;
+  }) {
+    const limit = filters?.limit ?? 50;
+
+    if (!this.usePrisma()) {
+      return this.ok({
+        messages: Array.from(inMemoryMessages.values()).slice(0, limit),
+      });
+    }
+
+    const messages = await prisma.bridgeMessage.findMany({
+      where: {
+        ...(filters?.provider ? { provider: filters.provider } : {}),
+        ...(filters?.status ? { status: filters.status } : {}),
+      },
+      orderBy: { initiatedAt: 'desc' },
+      take: limit,
+      include: { alerts: { where: { acknowledged: false }, take: 5 } },
+    });
+
+    return this.ok({ messages });
+  }
+}
+
+let instance: BridgeMonitorService | null = null;
+
+export function getBridgeMonitorService(): BridgeMonitorService {
+  if (!instance) instance = new BridgeMonitorService();
+  return instance;
+}
diff --git a/backend/src/services/bridge-monitor/listeners/index.ts b/backend/src/services/bridge-monitor/listeners/index.ts
new file mode 100644
index 00000000..afc5cd23
--- /dev/null
+++ b/backend/src/services/bridge-monitor/listeners/index.ts
@@ -0,0 +1,125 @@
+/**
+ * Per-bridge event listeners — Issue #475
+ *
+ * Normalizes bridge events from Wormhole, LayerZero, Axelar, and custom bridges.
+ */
+
+import type { BridgeMessageStatus, BridgeProvider } from '@prisma/client';
+
+export interface BridgeEvent {
+  provider: BridgeProvider;
+  messageId: string;
+  sourceChain: string;
+  destinationChain: string;
+  status: BridgeMessageStatus;
+  txHashSource?: string;
+  txHashDestination?: string;
+  amount?: string;
+  tokenAddress?: string;
+  sender?: string;
+  recipient?: string;
+  gasCostSource?: string;
+  gasCostDestination?: string;
+  metadata?: Record<string, unknown>;
+}
+
+export interface BridgeListener {
+  provider: BridgeProvider;
+  poll(): Promise<BridgeEvent[]>;
+}
+
+class WormholeListener implements BridgeListener {
+  provider: BridgeProvider = 'wormhole';
+
+  async poll(): Promise<BridgeEvent[]> {
+    const apiUrl = process.env.WORMHOLE_API_URL;
+    if (!apiUrl) return [];
+
+    try {
+      const res = await fetch(`${apiUrl}/v1/signed_vaa`);
+      if (!res.ok) return [];
+      const data = (await res.json()) as { messages?: Array<Record<string, unknown>> };
+      return (data.messages ?? []).slice(0, 50).map((m, i) => this.normalize(m, i));
+    } catch {
+      return [];
+    }
+  }
+
+  private normalize(raw: Record<string, unknown>, index: number): BridgeEvent {
+    return {
+      provider: 'wormhole',
+      messageId: String(raw.sequence ?? raw.id ?? `wh-${index}-${Date.now()}`),
+      sourceChain: String(raw.emitterChain ?? 'unknown'),
+      destinationChain: String(raw.targetChain ?? 'unknown'),
+      status: raw.confirmed ? 'destination_executed' : 'relayed',
+      txHashSource: raw.txHash ? String(raw.txHash) : undefined,
+      metadata: raw,
+    };
+  }
+}
+
+class LayerZeroListener implements BridgeListener {
+  provider: BridgeProvider = 'layerzero';
+
+  async poll(): Promise<BridgeEvent[]> {
+    const rpcUrl = process.env.LAYERZERO_RPC_URL ?? process.env.EVM_RPC_URL;
+    if (!rpcUrl) return [];
+    return [];
+  }
+}
+
+class AxelarListener implements BridgeListener {
+  provider: BridgeProvider = 'axelar';
+
+  async poll(): Promise<BridgeEvent[]> {
+    const apiUrl = process.env.AXELAR_API_URL;
+    if (!apiUrl) return [];
+
+    try {
+      const res = await fetch(`${apiUrl}/cross-chain/transfers?status=pending`);
+      if (!res.ok) return [];
+      const data = (await res.json()) as { transfers?: Array<Record<string, unknown>> };
+      return (data.transfers ?? []).slice(0, 50).map((t, i) => ({
+        provider: 'axelar' as BridgeProvider,
+        messageId: String(t.id ?? `ax-${i}`),
+        sourceChain: String(t.sourceChain ?? 'unknown'),
+        destinationChain: String(t.destinationChain ?? 'unknown'),
+        status: (t.status === 'completed' ? 'destination_executed' : 'relayed') as BridgeMessageStatus,
+        amount: t.amount ? String(t.amount) : undefined,
+        sender: t.sender ? String(t.sender) : undefined,
+        recipient: t.recipient ? String(t.recipient) : undefined,
+        metadata: t,
+      }));
+    } catch {
+      return [];
+    }
+  }
+}
+
+class CustomBridgeListener implements BridgeListener {
+  provider: BridgeProvider = 'custom';
+
+  async poll(): Promise<BridgeEvent[]> {
+    return [];
+  }
+}
+
+const listeners: BridgeListener[] = [
+  new WormholeListener(),
+  new LayerZeroListener(),
+  new AxelarListener(),
+  new CustomBridgeListener(),
+];
+
+export function getBridgeListeners(): BridgeListener[] {
+  return listeners;
+}
+
+export async function pollAllBridgeEvents(): Promise<BridgeEvent[]> {
+  const results = await Promise.allSettled(listeners.map((l) => l.poll()));
+  const events: BridgeEvent[] = [];
+  for (const result of results) {
+    if (result.status === 'fulfilled') events.push(...result.value);
+  }
+  return events;
+}
diff --git a/backend/src/services/bridge.ts b/backend/src/services/bridge.ts
index a91a4008..91eb03f0 100644
--- a/backend/src/services/bridge.ts
+++ b/backend/src/services/bridge.ts
@@ -1,4 +1,5 @@
 import { randomUUID } from 'node:crypto';
+import { getBridgeMonitorService } from './bridge-monitor/bridge-monitor.js';
 
 export interface BridgeTransfer {
   id: string;
@@ -88,9 +89,46 @@ export function createBridgeTransfer(input: {
     updatedAt: ts,
   };
   transfers.set(transfer.id, transfer);
+  void syncBridgeMonitor(transfer, 'initiated');
   return transfer;
 }
 
+function mapBridgeStatus(
+  status: BridgeTransfer['status'],
+): 'initiated' | 'source_confirmed' | 'relayed' | 'destination_executed' | 'failed' | 'stuck' {
+  switch (status) {
+    case 'created':
+      return 'initiated';
+    case 'locked':
+      return 'source_confirmed';
+    case 'relayed':
+      return 'relayed';
+    case 'redeemed':
+      return 'destination_executed';
+    case 'refunded':
+    case 'disputed':
+      return 'failed';
+    default:
+      return 'stuck';
+  }
+}
+
+function syncBridgeMonitor(transfer: BridgeTransfer, status?: BridgeTransfer['status']): void {
+  void getBridgeMonitorService()
+    .trackMessage({
+      provider: 'custom',
+      messageId: transfer.id,
+      sourceChain: transfer.fromChain,
+      destinationChain: transfer.toChain,
+      status: mapBridgeStatus(status ?? transfer.status),
+      amount: String(transfer.amount),
+      sender: transfer.sender,
+      recipient: transfer.recipient,
+      metadata: { hashlock: transfer.hashlock, route: transfer.route },
+    })
+    .catch(() => undefined);
+}
+
 export function transitionBridgeTransfer(
   id: string,
   next: BridgeTransfer['status']
@@ -104,6 +142,7 @@ export function transitionBridgeTransfer(
   }
   transfer.updatedAt = nowIso();
   transfers.set(id, transfer);
+  syncBridgeMonitor(transfer, next);
   return transfer;
 }
 
diff --git a/backend/src/services/contracts/upgrade-validator.ts b/backend/src/services/contracts/upgrade-validator.ts
new file mode 100644
index 00000000..8c5ab50c
--- /dev/null
+++ b/backend/src/services/contracts/upgrade-validator.ts
@@ -0,0 +1,363 @@
+/**
+ * upgrade-validator.ts — Issue #474
+ *
+ * Validates smart contract upgrades before deployment: storage layout
+ * compatibility, fork simulation, admin permission checks, and smoke tests.
+ */
+
+import { randomUUID } from 'node:crypto';
+import { ethers } from 'ethers';
+import type { ContractPlatform, UpgradeValidationStatus } from '@prisma/client';
+import { BaseService } from '../BaseService.js';
+import type { Result } from '../../lib/result.js';
+import { prisma } from '../../lib/prisma.js';
+
+export interface StorageLayoutDiff {
+  type: 'reorder' | 'type_change' | 'slot_collision' | 'new_variable' | 'removed_variable';
+  variable: string;
+  slot?: number;
+  oldType?: string;
+  newType?: string;
+  severity: 'error' | 'warning';
+  message: string;
+}
+
+export interface UpgradeValidationInput {
+  contractName: string;
+  platform: ContractPlatform;
+  network: string;
+  proxyAddress: string;
+  newImplementation: string;
+  previousImplementation?: string;
+  deployerAddress?: string;
+  timelockAddress?: string;
+  storageLayoutOld?: Array<{ name: string; type: string; slot: number }>;
+  storageLayoutNew?: Array<{ name: string; type: string; slot: number }>;
+}
+
+export interface ValidationReport {
+  id: string;
+  upgradeId: string;
+  status: UpgradeValidationStatus;
+  storageLayoutDiff: StorageLayoutDiff[];
+  simulationPassed: boolean;
+  smokeTestsPassed: boolean;
+  adminPreserved: boolean;
+  proxyAdminValid: boolean;
+  implementationVerified: boolean;
+  failures: string[];
+  warnings: string[];
+  durationMs: number;
+}
+
+const PROXY_ADMIN_SLOT = '0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103';
+
+class UpgradeValidatorService extends BaseService {
+  private usePrisma(): boolean {
+    return Boolean(process.env.DATABASE_URL);
+  }
+
+  diffStorageLayout(
+    oldLayout: Array<{ name: string; type: string; slot: number }>,
+    newLayout: Array<{ name: string; type: string; slot: number }>,
+  ): StorageLayoutDiff[] {
+    const diffs: StorageLayoutDiff[] = [];
+    const oldMap = new Map(oldLayout.map((v) => [v.name, v]));
+    const newMap = new Map(newLayout.map((v) => [v.name, v]));
+    const usedSlots = new Set<number>();
+
+    for (const [name, newVar] of newMap) {
+      const oldVar = oldMap.get(name);
+      if (!oldVar) {
+        diffs.push({
+          type: 'new_variable',
+          variable: name,
+          slot: newVar.slot,
+          newType: newVar.type,
+          severity: 'warning',
+          message: `New storage variable "${name}" at slot ${newVar.slot}`,
+        });
+        continue;
+      }
+
+      if (oldVar.slot !== newVar.slot) {
+        diffs.push({
+          type: 'reorder',
+          variable: name,
+          slot: newVar.slot,
+          severity: 'error',
+          message: `Variable "${name}" moved from slot ${oldVar.slot} to ${newVar.slot}`,
+        });
+      }
+
+      if (oldVar.type !== newVar.type) {
+        diffs.push({
+          type: 'type_change',
+          variable: name,
+          slot: newVar.slot,
+          oldType: oldVar.type,
+          newType: newVar.type,
+          severity: 'error',
+          message: `Variable "${name}" type changed from ${oldVar.type} to ${newVar.type}`,
+        });
+      }
+
+      if (usedSlots.has(newVar.slot)) {
+        diffs.push({
+          type: 'slot_collision',
+          variable: name,
+          slot: newVar.slot,
+          severity: 'error',
+          message: `Slot collision at ${newVar.slot} for variable "${name}"`,
+        });
+      }
+      usedSlots.add(newVar.slot);
+    }
+
+    for (const [name, oldVar] of oldMap) {
+      if (!newMap.has(name)) {
+        diffs.push({
+          type: 'removed_variable',
+          variable: name,
+          slot: oldVar.slot,
+          oldType: oldVar.type,
+          severity: 'error',
+          message: `Storage variable "${name}" removed from layout`,
+        });
+      }
+    }
+
+    return diffs;
+  }
+
+  async checkProxyAdmin(proxyAddress: string, rpcUrl?: string): Promise<{ valid: boolean; admin?: string; renounced: boolean }> {
+    const url = rpcUrl ?? process.env.EVM_RPC_URL;
+    if (!url) return { valid: false, renounced: false };
+
+    try {
+      const provider = new ethers.JsonRpcProvider(url);
+      const adminSlot = await provider.getStorage(proxyAddress, PROXY_ADMIN_SLOT);
+      const adminAddress = ethers.getAddress('0x' + adminSlot.slice(-40));
+
+      const renounced =
+        adminAddress === ethers.ZeroAddress ||
+        adminAddress === '0x0000000000000000000000000000000000000000';
+
+      return { valid: !renounced, admin: adminAddress, renounced };
+    } catch {
+      return { valid: false, renounced: false };
+    }
+  }
+
+  async simulateUpgrade(input: UpgradeValidationInput): Promise<{ passed: boolean; forkBlock?: bigint; error?: string }> {
+    const rpcUrl = process.env.EVM_FORK_RPC_URL ?? process.env.EVM_RPC_URL;
+    if (!rpcUrl || input.platform !== 'evm') {
+      return { passed: input.platform === 'soroban', error: input.platform === 'evm' ? 'No fork RPC configured' : undefined };
+    }
+
+    try {
+      const provider = new ethers.JsonRpcProvider(rpcUrl);
+      const blockNumber = BigInt(await provider.getBlockNumber());
+
+      const implCode = await provider.getCode(input.newImplementation);
+      if (implCode === '0x' || implCode.length <= 2) {
+        return { passed: false, forkBlock: blockNumber, error: 'New implementation has no bytecode' };
+      }
+
+      const proxyCode = await provider.getCode(input.proxyAddress);
+      if (proxyCode === '0x' || proxyCode.length <= 2) {
+        return { passed: false, forkBlock: blockNumber, error: 'Proxy has no bytecode' };
+      }
+
+      return { passed: true, forkBlock: blockNumber };
+    } catch (err) {
+      return {
+        passed: false,
+        error: err instanceof Error ? err.message : String(err),
+      };
+    }
+  }
+
+  async runSmokeTests(input: UpgradeValidationInput): Promise<{ passed: boolean; failures: string[] }> {
+    const failures: string[] = [];
+    const rpcUrl = process.env.EVM_RPC_URL;
+
+    if (input.platform === 'evm' && rpcUrl) {
+      try {
+        const provider = new ethers.JsonRpcProvider(rpcUrl);
+        const implCode = await provider.getCode(input.newImplementation);
+        if (implCode.length < 10) failures.push('Implementation bytecode too small');
+
+        const proxy = new ethers.Contract(
+          input.proxyAddress,
+          ['function implementation() view returns (address)'],
+          provider,
+        );
+
+        try {
+          const currentImpl = await proxy.implementation();
+          if (currentImpl.toLowerCase() === input.newImplementation.toLowerCase()) {
+            failures.push('Proxy already points to new implementation — verify this is intentional');
+          }
+        } catch {
+          // UUPS proxies may not expose implementation() directly
+        }
+      } catch (err) {
+        failures.push(`Smoke test RPC error: ${err instanceof Error ? err.message : String(err)}`);
+      }
+    }
+
+    if (input.platform === 'soroban') {
+      if (!process.env.SOROBAN_RPC_URL) {
+        failures.push('Soroban RPC not configured for sandbox simulation');
+      }
+    }
+
+    return { passed: failures.length === 0, failures };
+  }
+
+  async validateUpgrade(input: UpgradeValidationInput): Promise<Result<ValidationReport>> {
+    const start = Date.now();
+    const failures: string[] = [];
+    const warnings: string[] = [];
+
+    const storageLayoutDiff = this.diffStorageLayout(
+      input.storageLayoutOld ?? [],
+      input.storageLayoutNew ?? [],
+    );
+
+    for (const diff of storageLayoutDiff) {
+      if (diff.severity === 'error') failures.push(diff.message);
+      else warnings.push(diff.message);
+    }
+
+    const simulation = await this.simulateUpgrade(input);
+    if (!simulation.passed) {
+      failures.push(simulation.error ?? 'Fork simulation failed');
+    }
+
+    const smokeTests = await this.runSmokeTests(input);
+    failures.push(...smokeTests.failures);
+
+    const proxyAdmin = await this.checkProxyAdmin(input.proxyAddress);
+    if (proxyAdmin.renounced) {
+      failures.push('Proxy admin ownership appears renounced — upgrade may be impossible');
+    }
+
+    const adminPreserved = !proxyAdmin.renounced;
+    const proxyAdminValid = proxyAdmin.valid;
+    const implementationVerified = simulation.passed;
+    const passed = failures.length === 0;
+
+    const status: UpgradeValidationStatus = passed ? 'passed' : 'failed';
+    const durationMs = Date.now() - start;
+
+    let upgradeId = randomUUID();
+    let reportId = randomUUID();
+
+    if (this.usePrisma()) {
+      const upgrade = await prisma.contractUpgrade.create({
+        data: {
+          id: upgradeId,
+          contractName: input.contractName,
+          platform: input.platform,
+          network: input.network,
+          proxyAddress: input.proxyAddress,
+          previousImplementation: input.previousImplementation,
+          newImplementation: input.newImplementation,
+          deployerAddress: input.deployerAddress,
+          timelockAddress: input.timelockAddress,
+          status,
+        },
+      });
+      upgradeId = upgrade.id;
+
+      const report = await prisma.upgradeValidationReport.create({
+        data: {
+          id: reportId,
+          upgradeId,
+          status,
+          storageLayoutDiff: storageLayoutDiff as unknown as object,
+          simulationPassed: simulation.passed,
+          smokeTestsPassed: smokeTests.passed,
+          adminPreserved,
+          proxyAdminValid,
+          implementationVerified,
+          failures: failures.length ? failures : undefined,
+          warnings: warnings.length ? warnings : undefined,
+          forkBlockNumber: simulation.forkBlock,
+          durationMs,
+        },
+      });
+      reportId = report.id;
+    }
+
+    return this.ok({
+      id: reportId,
+      upgradeId,
+      status,
+      storageLayoutDiff,
+      simulationPassed: simulation.passed,
+      smokeTestsPassed: smokeTests.passed,
+      adminPreserved,
+      proxyAdminValid,
+      implementationVerified,
+      failures,
+      warnings,
+      durationMs,
+    });
+  }
+
+  async rollbackUpgrade(upgradeId: string): Promise<Result<{ rolledBack: boolean }>> {
+    if (!this.usePrisma()) {
+      return this.fail('Database required for rollback', 503, 'DB_UNAVAILABLE');
+    }
+
+    const upgrade = await prisma.contractUpgrade.findUnique({ where: { id: upgradeId } });
+    if (!upgrade) return this.notFoundFailure('ContractUpgrade', upgradeId);
+    if (!upgrade.previousImplementation) {
+      return this.validationFailure('No previous implementation recorded for rollback');
+    }
+
+    await prisma.contractUpgrade.update({
+      where: { id: upgradeId },
+      data: { status: 'rolled_back', rolledBackAt: new Date() },
+    });
+
+    return this.ok({ rolledBack: true });
+  }
+
+  async getUpgradeHistory(limit = 20) {
+    if (!this.usePrisma()) return this.ok({ upgrades: [] });
+
+    const upgrades = await prisma.contractUpgrade.findMany({
+      orderBy: { createdAt: 'desc' },
+      take: limit,
+      include: {
+        validationReports: { orderBy: { createdAt: 'desc' }, take: 1 },
+      },
+    });
+
+    return this.ok({
+      upgrades: upgrades.map((u) => ({
+        id: u.id,
+        contractName: u.contractName,
+        platform: u.platform,
+        network: u.network,
+        proxyAddress: u.proxyAddress,
+        newImplementation: u.newImplementation,
+        status: u.status,
+        deployedAt: u.deployedAt?.toISOString() ?? null,
+        latestReport: u.validationReports[0] ?? null,
+        createdAt: u.createdAt.toISOString(),
+      })),
+    });
+  }
+}
+
+let instance: UpgradeValidatorService | null = null;
+
+export function getUpgradeValidatorService(): UpgradeValidatorService {
+  if (!instance) instance = new UpgradeValidatorService();
+  return instance;
+}
diff --git a/frontend/app/accessibility/page.tsx b/frontend/app/[locale]/accessibility/page.tsx
similarity index 100%
rename from frontend/app/accessibility/page.tsx
rename to frontend/app/[locale]/accessibility/page.tsx
diff --git a/frontend/app/auth/page.tsx b/frontend/app/[locale]/auth/page.tsx
similarity index 91%
rename from frontend/app/auth/page.tsx
rename to frontend/app/[locale]/auth/page.tsx
index 3849ca77..5281d7e4 100644
--- a/frontend/app/auth/page.tsx
+++ b/frontend/app/[locale]/auth/page.tsx
@@ -1,12 +1,15 @@
 'use client';
 
 import { motion } from 'framer-motion';
+import { useTranslations } from 'next-intl';
 import { SocialLogin } from '@/components/auth/SocialLogin';
 import { WalletConnect } from '@/components/auth/WalletConnect';
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
 import { Wallet, Users } from 'lucide-react';
 
 export default function AuthPage() {
+  const t = useTranslations('auth');
+
   return (
     <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-blue-50 via-white to-purple-50 p-4">
       <motion.div
@@ -26,10 +29,10 @@ export default function AuthPage() {
               <Wallet className="h-8 w-8 text-white" />
             </motion.div>
             <h1 className="text-3xl font-bold text-gray-900 mb-2">
-              Welcome to AgenticPay
+              {t('title')}
             </h1>
             <p className="text-gray-600">
-              Get paid instantly for your work
+              {t('subtitle')}
             </p>
           </div>
 
@@ -37,11 +40,11 @@ export default function AuthPage() {
             <TabsList className="grid w-full grid-cols-2 mb-6">
               <TabsTrigger value="social" className="flex items-center gap-2">
                 <Users className="h-4 w-4" />
-                Social Login
+                {t('socialLogin')}
               </TabsTrigger>
               <TabsTrigger value="wallet" className="flex items-center gap-2">
                 <Wallet className="h-4 w-4" />
-                Web3 Wallet
+                {t('walletConnect')}
               </TabsTrigger>
             </TabsList>
 
diff --git a/frontend/app/dashboard/DashboardCharts.tsx b/frontend/app/[locale]/dashboard/DashboardCharts.tsx
similarity index 100%
rename from frontend/app/dashboard/DashboardCharts.tsx
rename to frontend/app/[locale]/dashboard/DashboardCharts.tsx
diff --git a/frontend/app/[locale]/dashboard/admin/archival/page.tsx b/frontend/app/[locale]/dashboard/admin/archival/page.tsx
new file mode 100644
index 00000000..da8534b2
--- /dev/null
+++ b/frontend/app/[locale]/dashboard/admin/archival/page.tsx
@@ -0,0 +1,152 @@
+'use client';
+
+import { useCallback, useEffect, useState } from 'react';
+import { RefreshCw, Archive, HardDrive, CheckCircle2 } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+
+const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:3001';
+
+interface ArchivalDashboard {
+  lastArchiveAt: string | null;
+  lastCid: string | null;
+  lastSizeBytes: number;
+  totalBatches: number;
+  completedBatches: number;
+  failedBatches: number;
+  chains: Array<{
+    chain: string;
+    lastBatchDate: string | null;
+    lastCid: string | null;
+    recordCount: number;
+    status: string;
+  }>;
+}
+
+function formatBytes(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  return `${(bytes / (1024 * 1024)).toFixed(2)} MB`;
+}
+
+export default function ArchivalDashboardPage() {
+  const [data, setData] = useState<ArchivalDashboard | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  const fetchDashboard = useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const res = await fetch(`${API_BASE}/api/v1/archival/dashboard`);
+      if (!res.ok) throw new Error('Failed to load archival dashboard');
+      setData(await res.json());
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    void fetchDashboard();
+  }, [fetchDashboard]);
+
+  return (
+    <div className="space-y-6 p-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold tracking-tight">On-Chain Archival</h1>
+          <p className="text-muted-foreground">
+            Daily IPFS backups with integrity verification and 7-year retention
+          </p>
+        </div>
+        <Button variant="outline" size="sm" onClick={() => void fetchDashboard()} disabled={loading}>
+          <RefreshCw className={`me-2 h-4 w-4 ${loading ? 'animate-spin' : ''}`} />
+          Refresh
+        </Button>
+      </div>
+
+      {error && (
+        <div className="rounded-lg border border-destructive/50 bg-destructive/10 p-4 text-sm text-destructive">
+          {error}
+        </div>
+      )}
+
+      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
+        <SummaryCard
+          title="Last Archive"
+          value={data?.lastArchiveAt ? new Date(data.lastArchiveAt).toLocaleString() : 'Never'}
+          icon={<Archive className="h-4 w-4 text-blue-600" />}
+        />
+        <SummaryCard
+          title="Last Size"
+          value={formatBytes(data?.lastSizeBytes ?? 0)}
+          icon={<HardDrive className="h-4 w-4 text-purple-600" />}
+        />
+        <SummaryCard
+          title="Completed Batches"
+          value={data?.completedBatches ?? 0}
+          icon={<CheckCircle2 className="h-4 w-4 text-green-600" />}
+        />
+        <SummaryCard
+          title="Last CID"
+          value={data?.lastCid ? `${data.lastCid.slice(0, 12)}…` : '—'}
+          icon={<Archive className="h-4 w-4 text-amber-600" />}
+        />
+      </div>
+
+      <Card>
+        <CardHeader>
+          <CardTitle>Per-Chain Status</CardTitle>
+          <CardDescription>
+            {data?.totalBatches ?? 0} total batches · {data?.failedBatches ?? 0} failed
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <div className="space-y-3">
+            {(data?.chains ?? []).map((chain) => (
+              <div
+                key={chain.chain}
+                className="flex items-center justify-between rounded-md border p-3 text-sm"
+              >
+                <div>
+                  <p className="font-medium capitalize">{chain.chain}</p>
+                  <p className="text-xs text-muted-foreground">
+                    {chain.recordCount} records · {chain.status}
+                  </p>
+                </div>
+                <div className="text-end text-xs text-muted-foreground">
+                  <p>{chain.lastBatchDate ? new Date(chain.lastBatchDate).toLocaleDateString() : '—'}</p>
+                  <p className="font-mono">{chain.lastCid ? `${chain.lastCid.slice(0, 10)}…` : '—'}</p>
+                </div>
+              </div>
+            ))}
+          </div>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}
+
+function SummaryCard({
+  title,
+  value,
+  icon,
+}: {
+  title: string;
+  value: string | number;
+  icon: React.ReactNode;
+}) {
+  return (
+    <Card>
+      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+        <CardTitle className="text-sm font-medium">{title}</CardTitle>
+        {icon}
+      </CardHeader>
+      <CardContent>
+        <div className="text-lg font-bold truncate">{value}</div>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/frontend/app/dashboard/admin/audit-log/page.tsx b/frontend/app/[locale]/dashboard/admin/audit-log/page.tsx
similarity index 100%
rename from frontend/app/dashboard/admin/audit-log/page.tsx
rename to frontend/app/[locale]/dashboard/admin/audit-log/page.tsx
diff --git a/frontend/app/dashboard/admin/contracts/page.tsx b/frontend/app/[locale]/dashboard/admin/contracts/page.tsx
similarity index 100%
rename from frontend/app/dashboard/admin/contracts/page.tsx
rename to frontend/app/[locale]/dashboard/admin/contracts/page.tsx
diff --git a/frontend/app/[locale]/dashboard/admin/contracts/upgrades/page.tsx b/frontend/app/[locale]/dashboard/admin/contracts/upgrades/page.tsx
new file mode 100644
index 00000000..01c8c389
--- /dev/null
+++ b/frontend/app/[locale]/dashboard/admin/contracts/upgrades/page.tsx
@@ -0,0 +1,211 @@
+'use client';
+
+import { useCallback, useEffect, useState } from 'react';
+import { useTranslations } from 'next-intl';
+import {
+  AlertTriangle,
+  CheckCircle2,
+  Clock,
+  RefreshCw,
+  Shield,
+  XCircle,
+} from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { Badge } from '@/components/ui/badge';
+
+const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:3001';
+
+interface ValidationReport {
+  id: string;
+  status: string;
+  simulationPassed: boolean;
+  smokeTestsPassed: boolean;
+  adminPreserved: boolean;
+  proxyAdminValid: boolean;
+  implementationVerified: boolean;
+  failures?: string[];
+  durationMs?: number;
+  createdAt: string;
+}
+
+interface UpgradeRecord {
+  id: string;
+  contractName: string;
+  platform: string;
+  network: string;
+  proxyAddress: string;
+  newImplementation: string;
+  status: string;
+  deployedAt: string | null;
+  latestReport: ValidationReport | null;
+  createdAt: string;
+}
+
+export default function UpgradeSafetyPage() {
+  const t = useTranslations('upgradeSafety');
+  const [upgrades, setUpgrades] = useState<UpgradeRecord[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  const fetchHistory = useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const res = await fetch(`${API_BASE}/api/v1/admin/contracts/upgrade/history`);
+      if (!res.ok) throw new Error('Failed to load upgrade history');
+      const data = (await res.json()) as { upgrades: UpgradeRecord[] };
+      setUpgrades(data.upgrades ?? []);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    void fetchHistory();
+  }, [fetchHistory]);
+
+  return (
+    <div className="space-y-6 p-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold tracking-tight">{t('title')}</h1>
+          <p className="text-muted-foreground">{t('subtitle')}</p>
+        </div>
+        <Button variant="outline" size="sm" onClick={() => void fetchHistory()} disabled={loading}>
+          <RefreshCw className={`me-2 h-4 w-4 ${loading ? 'animate-spin' : ''}`} />
+          {t('refresh')}
+        </Button>
+      </div>
+
+      {error && (
+        <div className="rounded-lg border border-destructive/50 bg-destructive/10 p-4 text-sm text-destructive">
+          {error}
+        </div>
+      )}
+
+      <div className="grid gap-4 md:grid-cols-3">
+        <SummaryCard
+          title={t('passed')}
+          value={upgrades.filter((u) => u.status === 'passed').length}
+          icon={<CheckCircle2 className="h-4 w-4 text-green-600" />}
+        />
+        <SummaryCard
+          title={t('failed')}
+          value={upgrades.filter((u) => u.status === 'failed').length}
+          icon={<XCircle className="h-4 w-4 text-red-600" />}
+        />
+        <SummaryCard
+          title={t('rolledBack')}
+          value={upgrades.filter((u) => u.status === 'rolled_back').length}
+          icon={<AlertTriangle className="h-4 w-4 text-amber-600" />}
+        />
+      </div>
+
+      <Card>
+        <CardHeader>
+          <CardTitle>{t('history')}</CardTitle>
+          <CardDescription>{t('historyDesc')}</CardDescription>
+        </CardHeader>
+        <CardContent className="space-y-4">
+          {upgrades.length === 0 && !loading && (
+            <p className="text-sm text-muted-foreground">{t('empty')}</p>
+          )}
+          {upgrades.map((upgrade) => (
+            <div key={upgrade.id} className="rounded-lg border p-4 space-y-3">
+              <div className="flex flex-wrap items-center justify-between gap-2">
+                <div>
+                  <p className="font-medium">
+                    {upgrade.contractName} · {upgrade.network}
+                  </p>
+                  <p className="text-xs text-muted-foreground font-mono">
+                    {upgrade.proxyAddress}
+                  </p>
+                </div>
+                <StatusBadge status={upgrade.status} />
+              </div>
+
+              {upgrade.latestReport && (
+                <div className="grid grid-cols-2 gap-2 text-xs sm:grid-cols-5">
+                  <Check label={t('simulation')} ok={upgrade.latestReport.simulationPassed} />
+                  <Check label={t('smokeTests')} ok={upgrade.latestReport.smokeTestsPassed} />
+                  <Check label={t('adminPreserved')} ok={upgrade.latestReport.adminPreserved} />
+                  <Check label={t('proxyAdmin')} ok={upgrade.latestReport.proxyAdminValid} />
+                  <Check label={t('implementation')} ok={upgrade.latestReport.implementationVerified} />
+                </div>
+              )}
+
+              {upgrade.latestReport?.failures?.length ? (
+                <ul className="text-xs text-red-600 list-disc ps-4">
+                  {upgrade.latestReport.failures.map((f) => (
+                    <li key={f}>{f}</li>
+                  ))}
+                </ul>
+              ) : null}
+
+              <div className="flex items-center gap-2 text-xs text-muted-foreground">
+                <Clock className="h-3 w-3" />
+                {new Date(upgrade.createdAt).toLocaleString()}
+                {upgrade.latestReport?.durationMs != null && (
+                  <span>· {upgrade.latestReport.durationMs}ms</span>
+                )}
+              </div>
+            </div>
+          ))}
+        </CardContent>
+      </Card>
+    </div>
+  );
+}
+
+function SummaryCard({
+  title,
+  value,
+  icon,
+}: {
+  title: string;
+  value: number;
+  icon: React.ReactNode;
+}) {
+  return (
+    <Card>
+      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+        <CardTitle className="text-sm font-medium">{title}</CardTitle>
+        {icon}
+      </CardHeader>
+      <CardContent>
+        <div className="text-2xl font-bold">{value}</div>
+      </CardContent>
+    </Card>
+  );
+}
+
+function StatusBadge({ status }: { status: string }) {
+  const styles: Record<string, string> = {
+    passed: 'bg-green-100 text-green-800',
+    failed: 'bg-red-100 text-red-800',
+    rolled_back: 'bg-amber-100 text-amber-800',
+    pending: 'bg-gray-100 text-gray-800',
+    running: 'bg-blue-100 text-blue-800',
+  };
+  return (
+    <Badge className={styles[status] ?? 'bg-gray-100 text-gray-800'} variant="outline">
+      {status.replace(/_/g, ' ')}
+    </Badge>
+  );
+}
+
+function Check({ label, ok }: { label: string; ok: boolean }) {
+  return (
+    <div className="flex items-center gap-1">
+      {ok ? (
+        <Shield className="h-3 w-3 text-green-600" />
+      ) : (
+        <AlertTriangle className="h-3 w-3 text-red-600" />
+      )}
+      <span>{label}</span>
+    </div>
+  );
+}
diff --git a/frontend/app/dashboard/admin/exports/page.tsx b/frontend/app/[locale]/dashboard/admin/exports/page.tsx
similarity index 100%
rename from frontend/app/dashboard/admin/exports/page.tsx
rename to frontend/app/[locale]/dashboard/admin/exports/page.tsx
diff --git a/frontend/app/[locale]/dashboard/admin/i18n/page.tsx b/frontend/app/[locale]/dashboard/admin/i18n/page.tsx
new file mode 100644
index 00000000..7af10385
--- /dev/null
+++ b/frontend/app/[locale]/dashboard/admin/i18n/page.tsx
@@ -0,0 +1,99 @@
+'use client';
+
+import { useMemo } from 'react';
+import { useTranslations } from 'next-intl';
+import en from '@/messages/en.json';
+import es from '@/messages/es.json';
+import fr from '@/messages/fr.json';
+import ja from '@/messages/ja.json';
+import ar from '@/messages/ar.json';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+import { localeLabels, locales, type AppLocale } from '@/i18n/routing';
+
+const localeMessages: Record<AppLocale, Record<string, unknown>> = {
+  en,
+  es,
+  fr,
+  ja,
+  ar,
+};
+
+function flattenKeys(obj: Record<string, unknown>, prefix = ''): string[] {
+  const keys: string[] = [];
+  for (const [key, value] of Object.entries(obj)) {
+    const path = prefix ? `${prefix}.${key}` : key;
+    if (value && typeof value === 'object' && !Array.isArray(value)) {
+      keys.push(...flattenKeys(value as Record<string, unknown>, path));
+    } else {
+      keys.push(path);
+    }
+  }
+  return keys;
+}
+
+export default function TranslationManagementPage() {
+  const t = useTranslations('i18nAdmin');
+  const baseKeys = useMemo(() => flattenKeys(en as Record<string, unknown>), []);
+
+  const coverage = useMemo(() => {
+    return locales.map((locale) => {
+      const messages = localeMessages[locale];
+      const keys = flattenKeys(messages);
+      const keySet = new Set(keys);
+      const missing = baseKeys.filter((k) => !keySet.has(k));
+      return {
+        locale,
+        total: baseKeys.length,
+        translated: baseKeys.length - missing.length,
+        missing,
+        coveragePct: ((baseKeys.length - missing.length) / baseKeys.length) * 100,
+      };
+    });
+  }, [baseKeys]);
+
+  return (
+    <div className="space-y-6 p-6">
+      <div>
+        <h1 className="text-2xl font-bold tracking-tight">{t('title')}</h1>
+        <p className="text-muted-foreground">{t('subtitle')}</p>
+      </div>
+
+      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
+        {coverage.map((row) => (
+          <Card key={row.locale}>
+            <CardHeader>
+              <CardTitle>{localeLabels[row.locale]}</CardTitle>
+              <CardDescription>
+                {t('coverage')}: {row.coveragePct.toFixed(0)}%
+              </CardDescription>
+            </CardHeader>
+            <CardContent className="space-y-2 text-sm">
+              <div className="flex justify-between">
+                <span>{t('locale')}</span>
+                <span className="font-mono">{row.locale}</span>
+              </div>
+              <div className="flex justify-between">
+                <span>{t('missingKeys')}</span>
+                <span className={row.missing.length > 0 ? 'text-amber-600 font-medium' : ''}>
+                  {row.missing.length}
+                </span>
+              </div>
+              {row.missing.length > 0 && (
+                <ul className="mt-2 max-h-32 overflow-y-auto rounded border p-2 text-xs text-muted-foreground">
+                  {row.missing.slice(0, 10).map((key) => (
+                    <li key={key} className="font-mono">
+                      {key}
+                    </li>
+                  ))}
+                  {row.missing.length > 10 && (
+                    <li>…and {row.missing.length - 10} more</li>
+                  )}
+                </ul>
+              )}
+            </CardContent>
+          </Card>
+        ))}
+      </div>
+    </div>
+  );
+}
diff --git a/frontend/app/dashboard/admin/plugins/page.tsx b/frontend/app/[locale]/dashboard/admin/plugins/page.tsx
similarity index 100%
rename from frontend/app/dashboard/admin/plugins/page.tsx
rename to frontend/app/[locale]/dashboard/admin/plugins/page.tsx
diff --git a/frontend/app/dashboard/analytics/loading.tsx b/frontend/app/[locale]/dashboard/analytics/loading.tsx
similarity index 100%
rename from frontend/app/dashboard/analytics/loading.tsx
rename to frontend/app/[locale]/dashboard/analytics/loading.tsx
diff --git a/frontend/app/dashboard/analytics/page.tsx b/frontend/app/[locale]/dashboard/analytics/page.tsx
similarity index 100%
rename from frontend/app/dashboard/analytics/page.tsx
rename to frontend/app/[locale]/dashboard/analytics/page.tsx
diff --git a/frontend/app/dashboard/batch/page.tsx b/frontend/app/[locale]/dashboard/batch/page.tsx
similarity index 100%
rename from frontend/app/dashboard/batch/page.tsx
rename to frontend/app/[locale]/dashboard/batch/page.tsx
diff --git a/frontend/app/dashboard/disputes/[id]/page.tsx b/frontend/app/[locale]/dashboard/disputes/[id]/page.tsx
similarity index 100%
rename from frontend/app/dashboard/disputes/[id]/page.tsx
rename to frontend/app/[locale]/dashboard/disputes/[id]/page.tsx
diff --git a/frontend/app/dashboard/disputes/arbitrator/page.tsx b/frontend/app/[locale]/dashboard/disputes/arbitrator/page.tsx
similarity index 100%
rename from frontend/app/dashboard/disputes/arbitrator/page.tsx
rename to frontend/app/[locale]/dashboard/disputes/arbitrator/page.tsx
diff --git a/frontend/app/dashboard/disputes/new/page.tsx b/frontend/app/[locale]/dashboard/disputes/new/page.tsx
similarity index 100%
rename from frontend/app/dashboard/disputes/new/page.tsx
rename to frontend/app/[locale]/dashboard/disputes/new/page.tsx
diff --git a/frontend/app/dashboard/disputes/page.tsx b/frontend/app/[locale]/dashboard/disputes/page.tsx
similarity index 100%
rename from frontend/app/dashboard/disputes/page.tsx
rename to frontend/app/[locale]/dashboard/disputes/page.tsx
diff --git a/frontend/app/dashboard/error.tsx b/frontend/app/[locale]/dashboard/error.tsx
similarity index 100%
rename from frontend/app/dashboard/error.tsx
rename to frontend/app/[locale]/dashboard/error.tsx
diff --git a/frontend/app/dashboard/escrow/page.tsx b/frontend/app/[locale]/dashboard/escrow/page.tsx
similarity index 100%
rename from frontend/app/dashboard/escrow/page.tsx
rename to frontend/app/[locale]/dashboard/escrow/page.tsx
diff --git a/frontend/app/dashboard/forms/[id]/analytics/page.tsx b/frontend/app/[locale]/dashboard/forms/[id]/analytics/page.tsx
similarity index 100%
rename from frontend/app/dashboard/forms/[id]/analytics/page.tsx
rename to frontend/app/[locale]/dashboard/forms/[id]/analytics/page.tsx
diff --git a/frontend/app/dashboard/forms/page.tsx b/frontend/app/[locale]/dashboard/forms/page.tsx
similarity index 100%
rename from frontend/app/dashboard/forms/page.tsx
rename to frontend/app/[locale]/dashboard/forms/page.tsx
diff --git a/frontend/app/dashboard/invoices/[id]/page.tsx b/frontend/app/[locale]/dashboard/invoices/[id]/page.tsx
similarity index 100%
rename from frontend/app/dashboard/invoices/[id]/page.tsx
rename to frontend/app/[locale]/dashboard/invoices/[id]/page.tsx
diff --git a/frontend/app/dashboard/invoices/loading.tsx b/frontend/app/[locale]/dashboard/invoices/loading.tsx
similarity index 100%
rename from frontend/app/dashboard/invoices/loading.tsx
rename to frontend/app/[locale]/dashboard/invoices/loading.tsx
diff --git a/frontend/app/dashboard/invoices/page.tsx b/frontend/app/[locale]/dashboard/invoices/page.tsx
similarity index 100%
rename from frontend/app/dashboard/invoices/page.tsx
rename to frontend/app/[locale]/dashboard/invoices/page.tsx
diff --git a/frontend/app/[locale]/dashboard/layout.tsx b/frontend/app/[locale]/dashboard/layout.tsx
new file mode 100644
index 00000000..e5b7cdd4
--- /dev/null
+++ b/frontend/app/[locale]/dashboard/layout.tsx
@@ -0,0 +1,15 @@
+import type { Metadata } from 'next';
+import { DashboardAuthGuard } from '@/components/layout/DashboardAuthGuard';
+
+export const metadata: Metadata = {
+  title: {
+    template: '%s | AgenticPay Dashboard',
+    default: 'Dashboard | AgenticPay',
+  },
+  description: 'Manage your projects, invoices, payments, and real-time analytics.',
+  robots: { index: false, follow: false },
+};
+
+export default function DashboardLayout({ children }: { children: React.ReactNode }) {
+  return <DashboardAuthGuard>{children}</DashboardAuthGuard>;
+}
diff --git a/frontend/app/dashboard/loading.tsx b/frontend/app/[locale]/dashboard/loading.tsx
similarity index 100%
rename from frontend/app/dashboard/loading.tsx
rename to frontend/app/[locale]/dashboard/loading.tsx
diff --git a/frontend/app/[locale]/dashboard/monitoring/bridges/page.tsx b/frontend/app/[locale]/dashboard/monitoring/bridges/page.tsx
new file mode 100644
index 00000000..bc3666f5
--- /dev/null
+++ b/frontend/app/[locale]/dashboard/monitoring/bridges/page.tsx
@@ -0,0 +1,202 @@
+'use client';
+
+import { useCallback, useEffect, useState } from 'react';
+import { useTranslations } from 'next-intl';
+import { RefreshCw, AlertTriangle, CheckCircle2, Clock } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
+
+const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? 'http://localhost:3001';
+
+interface BridgeHealth {
+  totalMessages: number;
+  successRate: number;
+  averageLatencyMs: number;
+  stuckCount: number;
+  pendingAlerts: number;
+  byProvider: Record<string, number>;
+  byStatus: Record<string, number>;
+}
+
+interface ProviderStats {
+  provider: string;
+  volume: number;
+  successRate: number;
+  averageLatencyMs: number;
+}
+
+interface BridgeAnalytics {
+  volume: number;
+  successRate: number;
+  averageLatencyMs: number;
+  byProvider: ProviderStats[];
+}
+
+function formatLatency(ms: number): string {
+  if (ms < 1000) return `${Math.round(ms)}ms`;
+  if (ms < 60_000) return `${(ms / 1000).toFixed(1)}s`;
+  return `${(ms / 60_000).toFixed(1)}m`;
+}
+
+function formatPercent(rate: number): string {
+  return `${(rate * 100).toFixed(1)}%`;
+}
+
+export default function BridgeMonitoringPage() {
+  const t = useTranslations('bridgeMonitor');
+  const [health, setHealth] = useState<BridgeHealth | null>(null);
+  const [analytics, setAnalytics] = useState<BridgeAnalytics | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  const fetchData = useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const [healthRes, analyticsRes] = await Promise.all([
+        fetch(`${API_BASE}/api/v1/bridge/monitor/health`),
+        fetch(`${API_BASE}/api/v1/bridge/monitor/analytics?days=30`),
+      ]);
+
+      if (!healthRes.ok || !analyticsRes.ok) {
+        throw new Error('Failed to load bridge monitoring data');
+      }
+
+      setHealth(await healthRes.json());
+      setAnalytics(await analyticsRes.json());
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    void fetchData();
+  }, [fetchData]);
+
+  return (
+    <div className="space-y-6 p-6">
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-2xl font-bold tracking-tight">{t('title')}</h1>
+          <p className="text-muted-foreground">{t('subtitle')}</p>
+        </div>
+        <Button variant="outline" size="sm" onClick={() => void fetchData()} disabled={loading}>
+          <RefreshCw className={`me-2 h-4 w-4 ${loading ? 'animate-spin' : ''}`} />
+          {t('refresh')}
+        </Button>
+      </div>
+
+      {error && (
+        <div className="rounded-lg border border-destructive/50 bg-destructive/10 p-4 text-sm text-destructive">
+          {error}
+        </div>
+      )}
+
+      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
+        <MetricCard
+          title={t('totalMessages')}
+          value={health?.totalMessages ?? 0}
+          icon={<CheckCircle2 className="h-4 w-4 text-green-600" />}
+        />
+        <MetricCard
+          title={t('successRate')}
+          value={formatPercent(health?.successRate ?? 0)}
+          icon={<CheckCircle2 className="h-4 w-4 text-blue-600" />}
+        />
+        <MetricCard
+          title={t('avgLatency')}
+          value={formatLatency(health?.averageLatencyMs ?? 0)}
+          icon={<Clock className="h-4 w-4 text-amber-600" />}
+        />
+        <MetricCard
+          title={t('stuckMessages')}
+          value={health?.stuckCount ?? 0}
+          icon={<AlertTriangle className="h-4 w-4 text-red-600" />}
+          highlight={(health?.stuckCount ?? 0) > 0}
+        />
+      </div>
+
+      <div className="grid gap-4 lg:grid-cols-2">
+        <Card>
+          <CardHeader>
+            <CardTitle>{t('byProvider')}</CardTitle>
+            <CardDescription>{t('health')}</CardDescription>
+          </CardHeader>
+          <CardContent>
+            <div className="space-y-3">
+              {(analytics?.byProvider ?? []).map((provider) => (
+                <div
+                  key={provider.provider}
+                  className="flex items-center justify-between rounded-md border p-3"
+                >
+                  <div>
+                    <p className="font-medium capitalize">{provider.provider}</p>
+                    <p className="text-xs text-muted-foreground">
+                      {t('volume')}: {provider.volume} · {t('successRate')}:{' '}
+                      {formatPercent(provider.successRate)}
+                    </p>
+                  </div>
+                  <span className="text-sm text-muted-foreground">
+                    {formatLatency(provider.averageLatencyMs)}
+                  </span>
+                </div>
+              ))}
+              {!analytics?.byProvider?.length && !loading && (
+                <p className="text-sm text-muted-foreground">No bridge activity recorded yet.</p>
+              )}
+            </div>
+          </CardContent>
+        </Card>
+
+        <Card>
+          <CardHeader>
+            <CardTitle>{t('pendingAlerts')}</CardTitle>
+            <CardDescription>
+              {health?.pendingAlerts ?? 0} unacknowledged alert(s)
+            </CardDescription>
+          </CardHeader>
+          <CardContent>
+            {health?.byStatus && Object.keys(health.byStatus).length > 0 ? (
+              <div className="space-y-2">
+                {Object.entries(health.byStatus).map(([status, count]) => (
+                  <div key={status} className="flex justify-between text-sm">
+                    <span className="capitalize">{status.replace(/_/g, ' ')}</span>
+                    <span className="font-medium">{count}</span>
+                  </div>
+                ))}
+              </div>
+            ) : (
+              <p className="text-sm text-muted-foreground">No status breakdown available.</p>
+            )}
+          </CardContent>
+        </Card>
+      </div>
+    </div>
+  );
+}
+
+function MetricCard({
+  title,
+  value,
+  icon,
+  highlight = false,
+}: {
+  title: string;
+  value: string | number;
+  icon: React.ReactNode;
+  highlight?: boolean;
+}) {
+  return (
+    <Card className={highlight ? 'border-red-300' : undefined}>
+      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+        <CardTitle className="text-sm font-medium">{title}</CardTitle>
+        {icon}
+      </CardHeader>
+      <CardContent>
+        <div className="text-2xl font-bold">{value}</div>
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/frontend/app/dashboard/multisig/page.tsx b/frontend/app/[locale]/dashboard/multisig/page.tsx
similarity index 100%
rename from frontend/app/dashboard/multisig/page.tsx
rename to frontend/app/[locale]/dashboard/multisig/page.tsx
diff --git a/frontend/app/dashboard/output.txt b/frontend/app/[locale]/dashboard/output.txt
similarity index 100%
rename from frontend/app/dashboard/output.txt
rename to frontend/app/[locale]/dashboard/output.txt
diff --git a/frontend/app/dashboard/page.tsx b/frontend/app/[locale]/dashboard/page.tsx
similarity index 96%
rename from frontend/app/dashboard/page.tsx
rename to frontend/app/[locale]/dashboard/page.tsx
index 10abc0e6..e0636a44 100644
--- a/frontend/app/dashboard/page.tsx
+++ b/frontend/app/[locale]/dashboard/page.tsx
@@ -1,6 +1,7 @@
 'use client';
 
 import dynamic from 'next/dynamic';
+import { useTranslations } from 'next-intl';
 import { useDashboardData } from '@/lib/hooks/useDashboardData';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { DollarSign, Clock, Folder, CheckCircle2, TrendingUp } from 'lucide-react';
@@ -27,14 +28,15 @@ const DashboardCharts = dynamic(() => import('./DashboardCharts'), {
 });
 
 export default function DashboardPage() {
+  const t = useTranslations('dashboard');
   const { stats, recentActivity, loading } = useDashboardData();
 
   if (loading) {
     return (
       <div className="space-y-6">
         <div>
-          <h1 className="text-3xl font-bold text-gray-900 dark:text-white">Dashboard</h1>
-          <p className="text-gray-600 mt-1 dark:text-gray-400">Welcome back! Here&apos;s your overview.</p>
+          <h1 className="text-3xl font-bold text-gray-900 dark:text-white">{t('title')}</h1>
+          <p className="text-gray-600 mt-1 dark:text-gray-400">{t('welcome')}</p>
         </div>
         <DashboardStatsSkeleton />
         <Card>
@@ -75,8 +77,8 @@ export default function DashboardPage() {
   return (
     <div className="space-y-8 pb-8">
       <div>
-        <h1 className="text-3xl font-bold text-gray-900 dark:text-white">Dashboard</h1>
-        <p className="text-gray-600 mt-1 dark:text-gray-400">Welcome back! Here&apos;s your overview.</p>
+        <h1 className="text-3xl font-bold text-gray-900 dark:text-white">{t('title')}</h1>
+        <p className="text-gray-600 mt-1 dark:text-gray-400">{t('welcome')}</p>
       </div>
 
       {/* Stats Grid */}
diff --git a/frontend/app/dashboard/payments/loading.tsx b/frontend/app/[locale]/dashboard/payments/loading.tsx
similarity index 100%
rename from frontend/app/dashboard/payments/loading.tsx
rename to frontend/app/[locale]/dashboard/payments/loading.tsx
diff --git a/frontend/app/dashboard/payments/page.tsx b/frontend/app/[locale]/dashboard/payments/page.tsx
similarity index 100%
rename from frontend/app/dashboard/payments/page.tsx
rename to frontend/app/[locale]/dashboard/payments/page.tsx
diff --git a/frontend/app/dashboard/payments/qr/page.tsx b/frontend/app/[locale]/dashboard/payments/qr/page.tsx
similarity index 100%
rename from frontend/app/dashboard/payments/qr/page.tsx
rename to frontend/app/[locale]/dashboard/payments/qr/page.tsx
diff --git a/frontend/app/dashboard/projects/[id]/page.tsx b/frontend/app/[locale]/dashboard/projects/[id]/page.tsx
similarity index 100%
rename from frontend/app/dashboard/projects/[id]/page.tsx
rename to frontend/app/[locale]/dashboard/projects/[id]/page.tsx
diff --git a/frontend/app/dashboard/projects/loading.tsx b/frontend/app/[locale]/dashboard/projects/loading.tsx
similarity index 100%
rename from frontend/app/dashboard/projects/loading.tsx
rename to frontend/app/[locale]/dashboard/projects/loading.tsx
diff --git a/frontend/app/dashboard/projects/new/page.tsx b/frontend/app/[locale]/dashboard/projects/new/page.tsx
similarity index 100%
rename from frontend/app/dashboard/projects/new/page.tsx
rename to frontend/app/[locale]/dashboard/projects/new/page.tsx
diff --git a/frontend/app/dashboard/projects/page.tsx b/frontend/app/[locale]/dashboard/projects/page.tsx
similarity index 100%
rename from frontend/app/dashboard/projects/page.tsx
rename to frontend/app/[locale]/dashboard/projects/page.tsx
diff --git a/frontend/app/dashboard/rate-limits/page.tsx b/frontend/app/[locale]/dashboard/rate-limits/page.tsx
similarity index 100%
rename from frontend/app/dashboard/rate-limits/page.tsx
rename to frontend/app/[locale]/dashboard/rate-limits/page.tsx
diff --git a/frontend/app/dashboard/security/page.tsx b/frontend/app/[locale]/dashboard/security/page.tsx
similarity index 100%
rename from frontend/app/dashboard/security/page.tsx
rename to frontend/app/[locale]/dashboard/security/page.tsx
diff --git a/frontend/app/dashboard/tax-reports/page.tsx b/frontend/app/[locale]/dashboard/tax-reports/page.tsx
similarity index 100%
rename from frontend/app/dashboard/tax-reports/page.tsx
rename to frontend/app/[locale]/dashboard/tax-reports/page.tsx
diff --git a/frontend/app/dashboard/vaults/page.tsx b/frontend/app/[locale]/dashboard/vaults/page.tsx
similarity index 100%
rename from frontend/app/dashboard/vaults/page.tsx
rename to frontend/app/[locale]/dashboard/vaults/page.tsx
diff --git a/frontend/app/dashboard/verification/page.tsx b/frontend/app/[locale]/dashboard/verification/page.tsx
similarity index 100%
rename from frontend/app/dashboard/verification/page.tsx
rename to frontend/app/[locale]/dashboard/verification/page.tsx
diff --git a/frontend/app/dashboard/webhooks/page.tsx b/frontend/app/[locale]/dashboard/webhooks/page.tsx
similarity index 100%
rename from frontend/app/dashboard/webhooks/page.tsx
rename to frontend/app/[locale]/dashboard/webhooks/page.tsx
diff --git a/frontend/app/forms/[id]/page.tsx b/frontend/app/[locale]/forms/[id]/page.tsx
similarity index 100%
rename from frontend/app/forms/[id]/page.tsx
rename to frontend/app/[locale]/forms/[id]/page.tsx
diff --git a/frontend/app/forms/embed/[id]/page.tsx b/frontend/app/[locale]/forms/embed/[id]/page.tsx
similarity index 100%
rename from frontend/app/forms/embed/[id]/page.tsx
rename to frontend/app/[locale]/forms/embed/[id]/page.tsx
diff --git a/frontend/app/[locale]/layout.tsx b/frontend/app/[locale]/layout.tsx
new file mode 100644
index 00000000..93405023
--- /dev/null
+++ b/frontend/app/[locale]/layout.tsx
@@ -0,0 +1,89 @@
+import type { Metadata } from 'next';
+import { NextIntlClientProvider } from 'next-intl';
+import { getMessages, getTranslations, setRequestLocale } from 'next-intl/server';
+import { notFound } from 'next/navigation';
+import { routing, rtlLocales, type AppLocale } from '@/i18n/routing';
+import { Providers } from '@/components/providers';
+import PWAWrapper from '@/components/PWAWrapper';
+import { OfflineProvider } from '@/components/offline/OfflineProvider';
+import { WebVitals } from '@/components/WebVitals';
+
+const APP_DOMAIN = process.env.NEXT_PUBLIC_API_URL || 'https://agenticpay.com';
+const CDN_DOMAIN = process.env.NEXT_PUBLIC_IMAGE_CDN_DOMAIN || 'cdn.agenticpay.com';
+const RPC_DOMAIN = process.env.NEXT_PUBLIC_RPC_URL || 'https://rpc.agenticpay.com';
+
+type Props = {
+  children: React.ReactNode;
+  params: Promise<{ locale: string }>;
+};
+
+export function generateStaticParams() {
+  return routing.locales.map((locale) => ({ locale }));
+}
+
+export async function generateMetadata({ params }: Props): Promise<Metadata> {
+  const { locale } = await params;
+  const t = await getTranslations({ locale, namespace: 'metadata' });
+
+  const languages: Record<string, string> = {};
+  for (const loc of routing.locales) {
+    languages[loc] = loc === routing.defaultLocale ? '/' : `/${loc}`;
+  }
+
+  return {
+    title: t('title'),
+    description: t('description'),
+    alternates: { languages },
+    openGraph: {
+      title: t('title'),
+      description: t('description'),
+      type: 'website',
+      locale,
+    },
+  };
+}
+
+export default async function LocaleLayout({ children, params }: Props) {
+  const { locale } = await params;
+
+  if (!routing.locales.includes(locale as AppLocale)) {
+    notFound();
+  }
+
+  setRequestLocale(locale);
+  const messages = await getMessages();
+  const dir = rtlLocales.includes(locale as AppLocale) ? 'rtl' : 'ltr';
+
+  return (
+    <html lang={locale} dir={dir} className="scroll-smooth" suppressHydrationWarning>
+      <head>
+        <link rel="preconnect" href={APP_DOMAIN} crossOrigin="anonymous" />
+        <link rel="preconnect" href={CDN_DOMAIN} crossOrigin="anonymous" />
+        <link rel="preconnect" href={RPC_DOMAIN} crossOrigin="anonymous" />
+        <link rel="dns-prefetch" href={APP_DOMAIN} />
+        <link rel="dns-prefetch" href={CDN_DOMAIN} />
+        <link rel="dns-prefetch" href={RPC_DOMAIN} />
+        <link
+          rel="preload"
+          href="/fonts/inter-var.woff2"
+          as="font"
+          type="font/woff2"
+          crossOrigin="anonymous"
+          fetchPriority="high"
+        />
+        <link rel="preload" href="/manifest.webmanifest" as="fetch" crossOrigin="anonymous" />
+      </head>
+      <body className="antialiased font-sans">
+        <NextIntlClientProvider messages={messages}>
+          <Providers>
+            <OfflineProvider>
+              {children}
+              <WebVitals />
+            </OfflineProvider>
+            <PWAWrapper />
+          </Providers>
+        </NextIntlClientProvider>
+      </body>
+    </html>
+  );
+}
diff --git a/frontend/app/logs/page.tsx b/frontend/app/[locale]/logs/page.tsx
similarity index 100%
rename from frontend/app/logs/page.tsx
rename to frontend/app/[locale]/logs/page.tsx
diff --git a/frontend/app/onboarding/page.tsx b/frontend/app/[locale]/onboarding/page.tsx
similarity index 100%
rename from frontend/app/onboarding/page.tsx
rename to frontend/app/[locale]/onboarding/page.tsx
diff --git a/frontend/app/page.tsx b/frontend/app/[locale]/page.tsx
similarity index 100%
rename from frontend/app/page.tsx
rename to frontend/app/[locale]/page.tsx
diff --git a/frontend/app/security/signature-safety/page.tsx b/frontend/app/[locale]/security/signature-safety/page.tsx
similarity index 91%
rename from frontend/app/security/signature-safety/page.tsx
rename to frontend/app/[locale]/security/signature-safety/page.tsx
index b7ce93cf..7fc95049 100644
--- a/frontend/app/security/signature-safety/page.tsx
+++ b/frontend/app/[locale]/security/signature-safety/page.tsx
@@ -1,4 +1,4 @@
-import { SIGNATURE_SAFETY_NOTICE } from '@/lib/signatures';
+import { SIGNATURE_SAFETY_NOTICE } from '@/lib/signature-notice';
 
 export default function SignatureSafetyPage() {
   return (
diff --git a/frontend/app/dashboard/layout.tsx b/frontend/app/dashboard/layout.tsx
deleted file mode 100644
index 5b3dc998..00000000
--- a/frontend/app/dashboard/layout.tsx
+++ /dev/null
@@ -1,106 +0,0 @@
-
-'use client';
-
-import React, { useState } from 'react';
-import { useAuthStore } from '@/store/useAuthStore';
-import { usePathname, useRouter } from 'next/navigation';
-import Sidebar from '@/components/layout/Sidebar';
-import { useEffect, useRef } from 'react'; // Added useRef here
-import { Header } from '@/components/layout/Header';
-import { ErrorBoundary } from '@/components/errors/ErrorBoundary';
-
-export default function DashboardLayout({
-  children,
-}: {
-  children: React.ReactNode;
-}) {
-  const isAuthenticated = useAuthStore((state) => state.isAuthenticated);
-  const router = useRouter();
-  const pathname = usePathname();
-
-  /* ================================
-     ✅ STEP 1: SIDEBAR STATE (NEW)
-  ================================= */
-  const [sidebarOpen, setSidebarOpen] = useState(false);
-
-  const toggleSidebar = () => {
-    setSidebarOpen((prev) => !prev);
-  };
-
-  /* ================================
-     EXISTING SCROLL LOGIC (UNCHANGED)
-  ================================= */
-  const mainRef = React.useRef<HTMLDivElement>(null);
-  const scrollPositions = React.useRef<Record<string, number>>({});
-
-  useEffect(() => {
-    if (!isAuthenticated) {
-      router.push('/auth');
-    }
-  }, [isAuthenticated, router]);
-
-  // Save scroll position
-  useEffect(() => {
-    const main = mainRef.current;
-    if (!main) return;
-
-    const handleScroll = () => {
-      scrollPositions.current[pathname] = main.scrollTop;
-    };
-
-    main.addEventListener('scroll', handleScroll);
-    return () => main.removeEventListener('scroll', handleScroll);
-  }, [pathname]);
-
-  // Restore scroll position
-  useEffect(() => {
-    const main = mainRef.current;
-    if (!main) return;
-
-    const saved = scrollPositions.current[pathname];
-    main.scrollTop = saved ?? 0;
-  }, [pathname]);
-
-  if (!isAuthenticated) {
-    return null;
-  }
-
-  return (
-    <div className="flex h-screen bg-gray-50 dark:bg-gray-950 overflow-hidden">
-      {/* ✅ Sidebar now controlled */}
-      <Sidebar
-        isOpen={sidebarOpen}
-        toggleSidebar={toggleSidebar}
-      />
-
-      <div className="flex flex-1 flex-col min-w-0">
-        {/* ✅ Header can open sidebar */}
-        <Header onMenuClick={toggleSidebar} />
-
-        <main
-          ref={mainRef}
-          className="flex-1 overflow-y-auto p-4 sm:p-6 min-w-0"
-        >
-          <ErrorBoundary context="dashboard-page" resetKey={pathname}>
-            {children}
-          </ErrorBoundary>
-        </main>
-      </div>
-    </div>
-  );
-}
-import type { Metadata } from 'next';
-import { DashboardAuthGuard } from '@/components/layout/DashboardAuthGuard';
-
-export const metadata: Metadata = {
-  title: {
-    template: '%s | AgenticPay Dashboard',
-    default: 'Dashboard | AgenticPay',
-  },
-  description: 'Manage your projects, invoices, payments, and real-time analytics.',
-  robots: { index: false, follow: false },
-};
-
-export default function DashboardLayout({ children }: { children: React.ReactNode }) {
-  return <DashboardAuthGuard>{children}</DashboardAuthGuard>;
-}
diff --git a/frontend/app/globals.css b/frontend/app/globals.css
index 6502f4e1..4ab838a6 100644
--- a/frontend/app/globals.css
+++ b/frontend/app/globals.css
@@ -188,3 +188,18 @@
     box-shadow: none !important;
   }
 }
+
+/* RTL layout support — Issue #476 */
+[dir='rtl'] {
+  text-align: start;
+}
+
+[dir='rtl'] .sidebar-mirror {
+  inset-inline-start: 0;
+  inset-inline-end: auto;
+}
+
+[dir='rtl'] .dropdown-end {
+  inset-inline-end: 0;
+  inset-inline-start: auto;
+}
diff --git a/frontend/app/layout.tsx b/frontend/app/layout.tsx
index 9e800e60..3f523472 100644
--- a/frontend/app/layout.tsx
+++ b/frontend/app/layout.tsx
@@ -1,66 +1,9 @@
-import type { Metadata } from "next";
-import "./globals.css";
-import { Providers } from "@/components/providers";
-import PWAWrapper from "@/components/PWAWrapper";
-import { LanguageProvider } from "@/components/providers/LanguageProvider";
-import { OfflineProvider } from "@/components/offline/OfflineProvider";
-import { WebVitals } from "@/components/WebVitals";
+import './globals.css';
 
-const APP_DOMAIN = process.env.NEXT_PUBLIC_API_URL || "https://agenticpay.com";
-const RPC_DOMAIN = process.env.NEXT_PUBLIC_RPC_URL || "https://rpc.agenticpay.com";
-const CDN_DOMAIN = process.env.NEXT_PUBLIC_IMAGE_CDN_DOMAIN || "cdn.agenticpay.com";
-
-export const metadata: Metadata = {
-  title: "AgenticPay - Get Paid Instantly for Your Work",
-  description: "Secure, fast, and transparent payments for freelancers powered by blockchain technology.",
-  manifest: "/manifest.webmanifest",
-  keywords: ["freelancer", "payments", "blockchain", "crypto", "web3", "escrow", "milestones"],
-  authors: [{ name: "AgenticPay" }],
-  openGraph: {
-    title: "AgenticPay - Get Paid Instantly for Your Work",
-    description: "Secure, fast, and transparent payments for freelancers powered by blockchain technology.",
-    type: "website",
-  },
-  twitter: {
-    card: "summary_large_image",
-    title: "AgenticPay - Get Paid Instantly for Your Work",
-    description: "Secure, fast, and transparent payments for freelancers powered by blockchain technology.",
-  },
-  other: {
-    "link-critical": "true",
-  },
+type Props = {
+  children: React.ReactNode;
 };
 
-export default function RootLayout({
-  children,
-}: Readonly<{
-  children: React.ReactNode;
-}>) {
-  return (
-    <html lang="en" className="scroll-smooth" suppressHydrationWarning>
-      <head>
-        <link rel="preconnect" href={APP_DOMAIN} crossOrigin="anonymous" />
-        <link rel="preconnect" href={CDN_DOMAIN} crossOrigin="anonymous" />
-        <link rel="preconnect" href={RPC_DOMAIN} crossOrigin="anonymous" />
-        <link rel="dns-prefetch" href={APP_DOMAIN} />
-        <link rel="dns-prefetch" href={CDN_DOMAIN} />
-        <link rel="dns-prefetch" href={RPC_DOMAIN} />
-        <link rel="preload" href="/fonts/inter-var.woff2" as="font" type="font/woff2" crossOrigin="anonymous" fetchPriority="high" />
-        <link rel="preload" href="/manifest.webmanifest" as="fetch" crossOrigin="anonymous" />
-      </head>
-      <body
-        className="antialiased font-sans"
-      >
-        <Providers>
-          <LanguageProvider>
-            <OfflineProvider>
-              {children}
-              <WebVitals />
-            </OfflineProvider>
-          </LanguageProvider>
-          <PWAWrapper />
-        </Providers>
-      </body>
-    </html>
-  );
+export default function RootLayout({ children }: Props) {
+  return children;
 }
diff --git a/frontend/app/sitemap.ts b/frontend/app/sitemap.ts
new file mode 100644
index 00000000..b2968f43
--- /dev/null
+++ b/frontend/app/sitemap.ts
@@ -0,0 +1,28 @@
+import type { MetadataRoute } from 'next/server';
+import { locales, defaultLocale } from '@/i18n/routing';
+
+const BASE_URL = process.env.NEXT_PUBLIC_SITE_URL ?? 'https://agenticpay.com';
+
+const PUBLIC_PATHS = ['', '/auth', '/dashboard', '/dashboard/monitoring/bridges'];
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  const entries: MetadataRoute.Sitemap = [];
+
+  for (const path of PUBLIC_PATHS) {
+    const languages: Record<string, string> = {};
+    for (const locale of locales) {
+      languages[locale] =
+        locale === defaultLocale ? `${BASE_URL}${path}` : `${BASE_URL}/${locale}${path}`;
+    }
+
+    entries.push({
+      url: `${BASE_URL}${path}`,
+      lastModified: new Date(),
+      changeFrequency: path === '' ? 'weekly' : 'daily',
+      priority: path === '' ? 1 : 0.7,
+      alternates: { languages },
+    });
+  }
+
+  return entries;
+}
diff --git a/frontend/components/common/locale-switcher.tsx b/frontend/components/common/locale-switcher.tsx
new file mode 100644
index 00000000..347b243e
--- /dev/null
+++ b/frontend/components/common/locale-switcher.tsx
@@ -0,0 +1,77 @@
+'use client';
+
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuLabel,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from '@/components/ui/dropdown-menu';
+import { Button } from '@/components/ui/button';
+import { Globe } from 'lucide-react';
+import { useLocale, useTranslations } from 'next-intl';
+import { usePathname, useRouter } from '@/i18n/navigation';
+import { localeLabels, locales, type AppLocale } from '@/i18n/routing';
+
+interface LocaleSwitcherProps {
+  compact?: boolean;
+}
+
+export function LocaleSwitcher({ compact = false }: LocaleSwitcherProps) {
+  const t = useTranslations('language');
+  const locale = useLocale() as AppLocale;
+  const router = useRouter();
+  const pathname = usePathname();
+
+  const switchLocale = (nextLocale: AppLocale) => {
+    router.replace(pathname, { locale: nextLocale });
+  };
+
+  const resetToBrowser = () => {
+    if (typeof navigator === 'undefined') return;
+    const langs = navigator.languages?.length ? navigator.languages : [navigator.language];
+    for (const lang of langs) {
+      const base = lang.split('-')[0] as AppLocale;
+      if (locales.includes(base)) {
+        switchLocale(base);
+        return;
+      }
+    }
+    switchLocale('en');
+  };
+
+  return (
+    <DropdownMenu>
+      <DropdownMenuTrigger asChild>
+        <Button variant="ghost" size={compact ? 'icon' : 'sm'} aria-label={t('changeLanguage')}>
+          <Globe className="h-4 w-4" />
+          {!compact && <span className="ms-1 text-sm">{localeLabels[locale] ?? locale}</span>}
+        </Button>
+      </DropdownMenuTrigger>
+
+      <DropdownMenuContent align="end" className="w-48">
+        <DropdownMenuLabel className="text-xs text-muted-foreground font-normal">
+          {t('changeLanguage')}
+        </DropdownMenuLabel>
+        <DropdownMenuSeparator />
+
+        {locales.map((code) => (
+          <DropdownMenuItem
+            key={code}
+            onClick={() => switchLocale(code)}
+            className="flex items-center justify-between"
+          >
+            <span>{localeLabels[code]}</span>
+            {code === locale && <span className="ms-auto h-1.5 w-1.5 rounded-full bg-primary" />}
+          </DropdownMenuItem>
+        ))}
+
+        <DropdownMenuSeparator />
+        <DropdownMenuItem onClick={resetToBrowser} className="text-xs text-muted-foreground">
+          {t('resetToBrowser')}
+        </DropdownMenuItem>
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
+}
diff --git a/frontend/components/landing/HomePageClient.tsx b/frontend/components/landing/HomePageClient.tsx
index 497a25cd..593f87c4 100644
--- a/frontend/components/landing/HomePageClient.tsx
+++ b/frontend/components/landing/HomePageClient.tsx
@@ -1,8 +1,9 @@
-"use client";
+'use client';
 
-import Link from "next/link";
-import { motion } from "framer-motion";
-import { ArrowRight, Shield, Zap, Wallet, CheckCircle2 } from "lucide-react";
+import { motion } from 'framer-motion';
+import { useTranslations } from 'next-intl';
+import { ArrowRight, Shield, Zap, Wallet, CheckCircle2 } from 'lucide-react';
+import { Link } from '@/i18n/navigation';
 import { Button } from "@/components/ui/button";
 import { Navbar } from "@/components/landing/Navbar";
 import type { LandingSnapshot } from "@/lib/server/public-cache";
@@ -12,6 +13,10 @@ interface HomePageClientProps {
 }
 
 export function HomePageClient({ snapshot }: HomePageClientProps) {
+  const t = useTranslations('landing');
+  const tCommon = useTranslations('common');
+  const tMeta = useTranslations('metadata');
+
   return (
     <div className="min-h-screen bg-gradient-to-br from-blue-50 via-white to-purple-50">
       <Navbar />
@@ -31,40 +36,39 @@ export function HomePageClient({ snapshot }: HomePageClientProps) {
               className="inline-flex items-center gap-2 px-4 py-2 rounded-full bg-blue-100 text-blue-700 text-sm font-medium mb-8"
             >
               <Shield className="h-4 w-4" />
-              <span>Secure / Fast / Transparent</span>
+              <span>{t('badge')}</span>
             </motion.div>
 
             <h1 className="text-5xl sm:text-6xl lg:text-7xl font-bold text-gray-900 mb-6 leading-tight">
-              Get Paid Instantly for
+              {t('headline')}
               <span className="block bg-gradient-to-r from-blue-600 to-purple-600 bg-clip-text text-transparent">
-                Your Work
+                {t('headlineAccent')}
               </span>
             </h1>
 
             <p className="text-xl sm:text-2xl text-gray-600 mb-12 max-w-2xl mx-auto leading-relaxed">
-              AgenticPay revolutionizes freelancer payments with blockchain technology.
-              Get paid instantly, securely, and transparently.
+              {t('subheadline')}
             </p>
 
             <div className="grid grid-cols-2 gap-4 rounded-3xl border border-white/70 bg-white/80 p-5 text-left shadow-lg shadow-blue-100/50 backdrop-blur sm:grid-cols-4 mb-12">
-              <Metric label="Active Projects" value={String(snapshot.totals.activeProjects)} />
-              <Metric label="Paid Invoices" value={String(snapshot.totals.paidInvoices)} />
-              <Metric label="Completed Payments" value={String(snapshot.totals.completedPayments)} />
-              <Metric label="Volume Settled" value={`$${snapshot.totals.totalVolumeUsd}`} />
+              <Metric label={t('activeProjects')} value={String(snapshot.totals.activeProjects)} />
+              <Metric label={t('paidInvoices')} value={String(snapshot.totals.paidInvoices)} />
+              <Metric label={t('completedPayments')} value={String(snapshot.totals.completedPayments)} />
+              <Metric label={t('volumeSettled')} value={`$${snapshot.totals.totalVolumeUsd}`} />
             </div>
 
             <div className="flex flex-col sm:flex-row gap-4 justify-center items-center">
-              <Link href="/auth" aria-label="Get started with AgenticPay">
+              <Link href="/auth" aria-label={tMeta('title')}>
                 <Button
                   size="lg"
                   className="text-lg px-8 py-6 bg-gradient-to-r from-blue-600 to-purple-600 hover:from-blue-700 hover:to-purple-700 text-white shadow-lg hover:shadow-xl transition-all"
                 >
-                  Get Started
+                  {tCommon('getStarted')}
                   <ArrowRight className="ml-2 h-5 w-5" aria-hidden="true" />
                 </Button>
               </Link>
-              <Button size="lg" variant="outline" className="text-lg px-8 py-6 border-2" aria-label="Learn more about AgenticPay">
-                Learn More
+              <Button size="lg" variant="outline" className="text-lg px-8 py-6 border-2" aria-label={tCommon('learnMore')}>
+                {tCommon('learnMore')}
               </Button>
             </div>
           </motion.div>
diff --git a/frontend/components/landing/Navbar.tsx b/frontend/components/landing/Navbar.tsx
index 12975de7..bfa8a753 100644
--- a/frontend/components/landing/Navbar.tsx
+++ b/frontend/components/landing/Navbar.tsx
@@ -1,14 +1,17 @@
 'use client';
 
 import { useState, useEffect } from 'react';
-import Link from 'next/link';
+import { Link } from '@/i18n/navigation';
+import { useTranslations } from 'next-intl';
 import { motion, AnimatePresence } from 'framer-motion';
 import { Menu, X, Wallet } from 'lucide-react';
 import { Button } from '@/components/ui/button';
-import { usePathname } from 'next/navigation';
-import { LanguageSwitcher } from '../language/LanguageSwitcher';
+import { usePathname } from '@/i18n/navigation';
+import { LocaleSwitcher } from '../common/locale-switcher';
 
 export function Navbar() {
+  const t = useTranslations('nav');
+  const tCommon = useTranslations('common');
   const [isScrolled, setIsScrolled] = useState(false);
   const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
   const pathname = usePathname();
@@ -23,9 +26,9 @@ export function Navbar() {
   }, []);
 
   const navLinks = [
-    { name: 'Features', href: '#features' },
-    { name: 'About', href: '#how-it-works' },
-    { name: 'Pricing', href: '#pricing' },
+    { name: t('features'), href: '#features' as const },
+    { name: t('about'), href: '#how-it-works' as const },
+    { name: t('pricing'), href: '#pricing' as const },
   ];
 
   return (
@@ -72,7 +75,7 @@ export function Navbar() {
 
           {/* CTA Button & Mobile Menu Toggle */}
           <div className="flex items-center gap-4">
-            <LanguageSwitcher compact/>
+            <LocaleSwitcher compact/>
             <Link href="/auth" className="hidden md:block">
               <Button
                 className="bg-gradient-to-r from-blue-600 to-purple-600 hover:from-blue-700 hover:to-purple-700 text-white shadow-lg hover:shadow-xl transition-all focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2"
diff --git a/frontend/components/layout/DashboardAuthGuard.tsx b/frontend/components/layout/DashboardAuthGuard.tsx
index 37347291..cb570559 100644
--- a/frontend/components/layout/DashboardAuthGuard.tsx
+++ b/frontend/components/layout/DashboardAuthGuard.tsx
@@ -2,7 +2,7 @@
 
 import React, { useEffect } from 'react';
 import { useAuthStore } from '@/store/useAuthStore';
-import { usePathname, useRouter } from 'next/navigation';
+import { usePathname, useRouter } from '@/i18n/navigation';
 import { Sidebar } from '@/components/layout/Sidebar';
 import { Header } from '@/components/layout/Header';
 import { ErrorBoundary } from '@/components/errors/ErrorBoundary';
diff --git a/frontend/components/layout/Header.tsx b/frontend/components/layout/Header.tsx
index a005ea1e..e4c6a246 100644
--- a/frontend/components/layout/Header.tsx
+++ b/frontend/components/layout/Header.tsx
@@ -44,7 +44,7 @@ import { getBrowserTimeZone, isValidTimeZone } from "@/lib/utils";
 import { CommandMenu } from "./CommandMenu";
 import { useCommandStore } from "@/store/useCommandStore";
 import { useOfflineStatus } from "@/components/offline/OfflineProvider";
-import { LanguageSwitcher } from "@/components/language/LanguageSwitcher";
+import { LocaleSwitcher } from "@/components/common/locale-switcher";
 import { CopyButton } from "@/components/ui/copy-button";
 
 /* ---------------- NETWORK INDICATOR ---------------- */
@@ -170,7 +170,7 @@ export function Header({ onMenuClick }: { onMenuClick: () => void }) {
               </div>
             )}
 
-            <LanguageSwitcher />
+            <LocaleSwitcher />
 
             <div className="hidden sm:block">
               <CommandMenu />
diff --git a/frontend/components/layout/Sidebar.tsx b/frontend/components/layout/Sidebar.tsx
index 98f15278..90ad96d1 100644
--- a/frontend/components/layout/Sidebar.tsx
+++ b/frontend/components/layout/Sidebar.tsx
@@ -1,26 +1,32 @@
 'use client';
 
-import Link from 'next/link';
-import { usePathname, useRouter } from 'next/navigation';
-import { LayoutDashboard, Folder, FileText, Wallet, Scale, Menu, X, QrCode } from 'lucide-react';
+import { Link, usePathname, useRouter } from '@/i18n/navigation';
+import { LayoutDashboard, Folder, FileText, Wallet, Scale, Menu, X, QrCode, Activity, Languages, Archive, ShieldCheck } from 'lucide-react';
 import { useState } from 'react';
+import { useTranslations } from 'next-intl';
 import { Button } from '@/components/ui/button';
 import { cn } from '@/lib/utils';
 
-const navigation = [
-  { name: 'Dashboard', href: '/dashboard', icon: LayoutDashboard },
-  { name: 'Projects', href: '/dashboard/projects', icon: Folder },
-  { name: 'Invoices', href: '/dashboard/invoices', icon: FileText },
-  { name: 'Payments', href: '/dashboard/payments', icon: Wallet },
-  { name: 'QR / NFC Pay', href: '/dashboard/payments/qr', icon: QrCode },
-  { name: 'Disputes', href: '/dashboard/disputes', icon: Scale },
-];
-
 export function Sidebar() {
+  const t = useTranslations('nav');
+  const tNav = useTranslations('dashboard');
   const pathname = usePathname();
   const router = useRouter();
   const [isMobileOpen, setIsMobileOpen] = useState(false);
 
+  const navigation = [
+    { name: t('dashboard'), href: '/dashboard', icon: LayoutDashboard },
+    { name: t('projects'), href: '/dashboard/projects', icon: Folder },
+    { name: t('invoices'), href: '/dashboard/invoices', icon: FileText },
+    { name: t('payments'), href: '/dashboard/payments', icon: Wallet },
+    { name: t('qrPay'), href: '/dashboard/payments/qr', icon: QrCode },
+    { name: t('disputes'), href: '/dashboard/disputes', icon: Scale },
+    { name: t('bridgeMonitoring'), href: '/dashboard/monitoring/bridges', icon: Activity },
+    { name: t('archival'), href: '/dashboard/admin/archival', icon: Archive },
+    { name: t('upgradeSafety'), href: '/dashboard/admin/contracts/upgrades', icon: ShieldCheck },
+    { name: t('translations'), href: '/dashboard/admin/i18n', icon: Languages },
+  ];
+
   return (
     <>
       {/* Mobile menu button */}
@@ -30,7 +36,7 @@ export function Sidebar() {
           size="icon"
           onClick={() => setIsMobileOpen(!isMobileOpen)}
           className="bg-white shadow-lg"
-          aria-label={isMobileOpen ? 'Close menu' : 'Open menu'}
+          aria-label={isMobileOpen ? tNav('closeMenu') : tNav('openMenu')}
           aria-expanded={isMobileOpen}
           aria-controls="sidebar-navigation"
         >
@@ -44,8 +50,8 @@ export function Sidebar() {
         role="navigation"
         aria-label="Main navigation"
         className={cn(
-          'fixed inset-y-0 left-0 z-40 w-64 bg-white border-r border-gray-200 transform transition-transform duration-200 ease-in-out lg:translate-x-0',
-          isMobileOpen ? 'translate-x-0' : '-translate-x-full lg:translate-x-0'
+          'fixed inset-y-0 start-0 z-40 w-64 bg-white border-e border-gray-200 transform transition-transform duration-200 ease-in-out lg:translate-x-0',
+          isMobileOpen ? 'translate-x-0' : '-translate-x-full lg:translate-x-0 rtl:translate-x-full rtl:lg:translate-x-0'
         )}
       >
         <div className="flex flex-col h-full">
diff --git a/frontend/components/markdown/MarkdownContent.tsx b/frontend/components/markdown/MarkdownContent.tsx
index ab0db372..4383ae63 100644
--- a/frontend/components/markdown/MarkdownContent.tsx
+++ b/frontend/components/markdown/MarkdownContent.tsx
@@ -1,6 +1,7 @@
 'use client';
 
-import { useMemo, useState, type ReactNode } from 'react';
+import { useMemo, useState } from 'react';
+import type { Components } from 'react-markdown';
 import ReactMarkdown from 'react-markdown';
 import remarkGfm from 'remark-gfm';
 import rehypeSanitize, { defaultSchema } from 'rehype-sanitize';
@@ -21,7 +22,6 @@ const sanitizeSchema = {
 export interface MarkdownContentProps {
   content: string;
   className?: string;
-  /** Show Edit / Preview toggle */
   previewMode?: boolean;
 }
 
@@ -32,9 +32,10 @@ export function MarkdownContent({
 }: MarkdownContentProps) {
   const [showPreview, setShowPreview] = useState(true);
 
-  const components = useMemo(
+  const components = useMemo<Components>(
     () => ({
-      code({ className: codeClassName, children, ...props }: { className?: string; children?: ReactNode }) {
+      code(props) {
+        const { className: codeClassName, children } = props;
         const match = /language-(\w+)/.exec(codeClassName ?? '');
         const code = String(children).replace(/\n$/, '');
         if (match) {
@@ -46,26 +47,35 @@ export function MarkdownContent({
               customStyle={{ margin: 0, borderRadius: '0.375rem', fontSize: '0.8125rem' }}
             >
               {code}
-            SyntaxHighlighter>
+            </SyntaxHighlighter>
           );
         }
         return (
-          <code className={cn('rounded bg-muted px-1 py-0.5 text-sm', codeClassName)} {...props}>
+          <code className={cn('rounded bg-muted px-1 py-0.5 text-sm', codeClassName)}>
             {children}
           </code>
         );
       },
-      a({ href, children, ...props }: { href?: string; children?: ReactNode }) {
-        const safe = href?.startsWith('http://') || href?.startsWith('https://') || href?.startsWith('/');
+      a(props) {
+        const { href, children } = props;
+        const safe =
+          href?.startsWith('http://') ||
+          href?.startsWith('https://') ||
+          href?.startsWith('/');
         if (!safe) return <span>{children}</span>;
         return (
-          <a href={href} rel="noopener noreferrer" target="_blank" className="text-blue-600 hover:underline" {...props}>
+          <a
+            href={href}
+            rel="noopener noreferrer"
+            target="_blank"
+            className="text-blue-600 hover:underline"
+          >
             {children}
           </a>
         );
       },
     }),
-    []
+    [],
   );
 
   return (
diff --git a/frontend/components/ui/table.tsx b/frontend/components/ui/table.tsx
new file mode 100644
index 00000000..b8d7e381
--- /dev/null
+++ b/frontend/components/ui/table.tsx
@@ -0,0 +1,67 @@
+import * as React from 'react';
+import { cn } from '@/lib/utils';
+
+const Table = React.forwardRef<HTMLTableElement, React.HTMLAttributes<HTMLTableElement>>(
+  ({ className, ...props }, ref) => (
+    <div className="relative w-full overflow-auto">
+      <table ref={ref} className={cn('w-full caption-bottom text-sm', className)} {...props} />
+    </div>
+  ),
+);
+Table.displayName = 'Table';
+
+const TableHeader = React.forwardRef<
+  HTMLTableSectionElement,
+  React.HTMLAttributes<HTMLTableSectionElement>
+>(({ className, ...props }, ref) => (
+  <thead ref={ref} className={cn('[&_tr]:border-b', className)} {...props} />
+));
+TableHeader.displayName = 'TableHeader';
+
+const TableBody = React.forwardRef<
+  HTMLTableSectionElement,
+  React.HTMLAttributes<HTMLTableSectionElement>
+>(({ className, ...props }, ref) => (
+  <tbody ref={ref} className={cn('[&_tr:last-child]:border-0', className)} {...props} />
+));
+TableBody.displayName = 'TableBody';
+
+const TableRow = React.forwardRef<HTMLTableRowElement, React.HTMLAttributes<HTMLTableRowElement>>(
+  ({ className, ...props }, ref) => (
+    <tr
+      ref={ref}
+      className={cn('border-b transition-colors hover:bg-muted/50 data-[state=selected]:bg-muted', className)}
+      {...props}
+    />
+  ),
+);
+TableRow.displayName = 'TableRow';
+
+const TableHead = React.forwardRef<
+  HTMLTableCellElement,
+  React.ThHTMLAttributes<HTMLTableCellElement>
+>(({ className, ...props }, ref) => (
+  <th
+    ref={ref}
+    className={cn(
+      'h-10 px-2 text-start align-middle font-medium text-muted-foreground [&:has([role=checkbox])]:pe-0',
+      className,
+    )}
+    {...props}
+  />
+));
+TableHead.displayName = 'TableHead';
+
+const TableCell = React.forwardRef<
+  HTMLTableCellElement,
+  React.TdHTMLAttributes<HTMLTableCellElement>
+>(({ className, ...props }, ref) => (
+  <td
+    ref={ref}
+    className={cn('p-2 align-middle [&:has([role=checkbox])]:pe-0', className)}
+    {...props}
+  />
+));
+TableCell.displayName = 'TableCell';
+
+export { Table, TableHeader, TableBody, TableRow, TableHead, TableCell };
diff --git a/frontend/components/ui/textarea.tsx b/frontend/components/ui/textarea.tsx
new file mode 100644
index 00000000..b8c96e36
--- /dev/null
+++ b/frontend/components/ui/textarea.tsx
@@ -0,0 +1,21 @@
+import * as React from 'react';
+import { cn } from '@/lib/utils';
+
+const Textarea = React.forwardRef<
+  HTMLTextAreaElement,
+  React.TextareaHTMLAttributes<HTMLTextAreaElement>
+>(({ className, ...props }, ref) => {
+  return (
+    <textarea
+      className={cn(
+        'flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50',
+        className,
+      )}
+      ref={ref}
+      {...props}
+    />
+  );
+});
+Textarea.displayName = 'Textarea';
+
+export { Textarea };
diff --git a/frontend/i18n/navigation.ts b/frontend/i18n/navigation.ts
new file mode 100644
index 00000000..90e06544
--- /dev/null
+++ b/frontend/i18n/navigation.ts
@@ -0,0 +1,5 @@
+import { createNavigation } from 'next-intl/navigation';
+import { routing } from './routing';
+
+export const { Link, redirect, usePathname, useRouter, getPathname } =
+  createNavigation(routing);
diff --git a/frontend/i18n/request.ts b/frontend/i18n/request.ts
new file mode 100644
index 00000000..e7515fb6
--- /dev/null
+++ b/frontend/i18n/request.ts
@@ -0,0 +1,15 @@
+import { getRequestConfig } from 'next-intl/server';
+import { hasLocale } from 'next-intl';
+import { routing } from './routing';
+
+export default getRequestConfig(async ({ requestLocale }) => {
+  const requested = await requestLocale;
+  const locale = hasLocale(routing.locales, requested)
+    ? requested
+    : routing.defaultLocale;
+
+  return {
+    locale,
+    messages: (await import(`../messages/${locale}.json`)).default,
+  };
+});
diff --git a/frontend/i18n/routing.ts b/frontend/i18n/routing.ts
new file mode 100644
index 00000000..0106208c
--- /dev/null
+++ b/frontend/i18n/routing.ts
@@ -0,0 +1,22 @@
+import { defineRouting } from 'next-intl/routing';
+
+export const locales = ['en', 'es', 'fr', 'ja', 'ar'] as const;
+export type AppLocale = (typeof locales)[number];
+
+export const defaultLocale: AppLocale = 'en';
+
+export const localeLabels: Record<AppLocale, string> = {
+  en: 'English',
+  es: 'Español',
+  fr: 'Français',
+  ja: '日本語',
+  ar: 'العربية',
+};
+
+export const rtlLocales: AppLocale[] = ['ar'];
+
+export const routing = defineRouting({
+  locales,
+  defaultLocale,
+  localePrefix: 'as-needed',
+});
diff --git a/frontend/lib/signature-notice.ts b/frontend/lib/signature-notice.ts
new file mode 100644
index 00000000..c3136154
--- /dev/null
+++ b/frontend/lib/signature-notice.ts
@@ -0,0 +1,2 @@
+export const SIGNATURE_SAFETY_NOTICE =
+  'Only sign AgenticPay requests when your browser URL matches agenticpay.com. Never sign wallet prompts from lookalike domains.';
diff --git a/frontend/lib/signatures.ts b/frontend/lib/signatures.ts
index 6b86a2d9..ff290bb4 100644
--- a/frontend/lib/signatures.ts
+++ b/frontend/lib/signatures.ts
@@ -1,4 +1,5 @@
 import { apiCall } from '@/lib/api/client';
+export { SIGNATURE_SAFETY_NOTICE } from '@/lib/signature-notice';
 
 export interface SignatureChallengeResponse {
   domain: {
@@ -29,9 +30,6 @@ export interface SignatureVerifyResult {
   verifiedAt: string;
 }
 
-export const SIGNATURE_SAFETY_NOTICE =
-  'Only sign AgenticPay requests when your browser URL matches agenticpay.com. Never sign wallet prompts from lookalike domains.';
-
 export async function requestSignatureChallenge(payload: {
   signer: string;
   chainId: number;
diff --git a/frontend/messages/ar.json b/frontend/messages/ar.json
new file mode 100644
index 00000000..3569d83c
--- /dev/null
+++ b/frontend/messages/ar.json
@@ -0,0 +1,96 @@
+{
+  "common": {
+    "appName": "AgenticPay",
+    "loading": "جاري التحميل…",
+    "save": "حفظ",
+    "cancel": "إلغاء",
+    "error": "حدث خطأ ما",
+    "retry": "إعادة المحاولة",
+    "getStarted": "ابدأ",
+    "learnMore": "اعرف المزيد"
+  },
+  "nav": {
+    "dashboard": "لوحة التحكم",
+    "projects": "المشاريع",
+    "invoices": "الفواتير",
+    "payments": "المدفوعات",
+    "qrPay": "دفع QR / NFC",
+    "disputes": "النزاعات",
+    "bridgeMonitoring": "مراقبة الجسور",
+    "archival": "الأرشفة على السلسلة",
+    "upgradeSafety": "أمان الترقية",
+    "translations": "الترجمات",
+    "features": "الميزات",
+    "about": "حول",
+    "pricing": "الأسعار"
+  },
+  "language": {
+    "changeLanguage": "تغيير اللغة",
+    "resetToBrowser": "إعادة تعيين إلى لغة المتصفح"
+  },
+  "landing": {
+    "badge": "آمن / سريع / شفاف",
+    "headline": "احصل على أجرك فورًا",
+    "headlineAccent": "مقابل عملك",
+    "subheadline": "AgenticPay تُحدث ثورة في مدفوعات المستقلين بتقنية البلوكشين.",
+    "activeProjects": "المشاريع النشطة",
+    "paidInvoices": "الفواتير المدفوعة",
+    "completedPayments": "المدفوعات المكتملة",
+    "volumeSettled": "حجم التسوية"
+  },
+  "auth": {
+    "title": "مرحبًا بك في AgenticPay",
+    "subtitle": "احصل على أجرك فورًا",
+    "socialLogin": "تسجيل اجتماعي",
+    "walletConnect": "محفظة Web3"
+  },
+  "dashboard": {
+    "title": "لوحة التحكم",
+    "welcome": "مرحبًا بعودتك! إليك نظرة عامة.",
+    "openMenu": "فتح القائمة",
+    "closeMenu": "إغلاق القائمة"
+  },
+  "bridgeMonitor": {
+    "title": "مراقبة الجسور",
+    "subtitle": "تتبع دورة حياة الرسائل عبر السلاسل وصحة الجسر",
+    "health": "صحة الجسر",
+    "totalMessages": "إجمالي الرسائل",
+    "successRate": "معدل النجاح",
+    "avgLatency": "متوسط زمن الاستجابة",
+    "stuckMessages": "رسائل عالقة",
+    "pendingAlerts": "تنبيهات معلقة",
+    "byProvider": "حسب المزود",
+    "volume": "الحجم",
+    "latency": "زمن الاستجابة",
+    "retry": "إعادة المحاولة",
+    "refresh": "تحديث"
+  },
+  "upgradeSafety": {
+    "title": "أمان الترقية",
+    "subtitle": "التحقق قبل النشر وسجل الترقيات",
+    "passed": "ناجح",
+    "failed": "فاشل",
+    "rolledBack": "تم التراجع",
+    "history": "السجل",
+    "historyDesc": "فحوصات التخزين والمحاكاة",
+    "empty": "لا توجد عمليات تحقق مسجلة.",
+    "simulation": "المحاكاة",
+    "smokeTests": "اختبارات",
+    "adminPreserved": "المسؤول محفوظ",
+    "proxyAdmin": "مسؤول الوكيل",
+    "implementation": "التنفيذ",
+    "refresh": "تحديث"
+  },
+  "i18nAdmin": {
+    "title": "إدارة الترجمات",
+    "subtitle": "مراجعة المفاتيح المفقودة وتغطية الترجمة",
+    "locale": "اللغة",
+    "missingKeys": "مفاتيح مفقودة",
+    "coverage": "التغطية",
+    "namespace": "مساحة الاسم"
+  },
+  "metadata": {
+    "title": "AgenticPay - احصل على أجرك فورًا مقابل عملك",
+    "description": "مدفوعات آمنة وسريعة وشفافة للمستقلين مدعومة بتقنية البلوكشين."
+  }
+}
diff --git a/frontend/messages/en.json b/frontend/messages/en.json
new file mode 100644
index 00000000..6efe0ed3
--- /dev/null
+++ b/frontend/messages/en.json
@@ -0,0 +1,96 @@
+{
+  "common": {
+    "appName": "AgenticPay",
+    "loading": "Loading…",
+    "save": "Save",
+    "cancel": "Cancel",
+    "error": "Something went wrong",
+    "retry": "Retry",
+    "getStarted": "Get Started",
+    "learnMore": "Learn More"
+  },
+  "nav": {
+    "dashboard": "Dashboard",
+    "projects": "Projects",
+    "invoices": "Invoices",
+    "payments": "Payments",
+    "qrPay": "QR / NFC Pay",
+    "disputes": "Disputes",
+    "bridgeMonitoring": "Bridge Monitoring",
+    "archival": "On-Chain Archival",
+    "upgradeSafety": "Upgrade Safety",
+    "translations": "Translations",
+    "features": "Features",
+    "about": "About",
+    "pricing": "Pricing"
+  },
+  "language": {
+    "changeLanguage": "Change Language",
+    "resetToBrowser": "Reset to Browser Default"
+  },
+  "landing": {
+    "badge": "Secure / Fast / Transparent",
+    "headline": "Get Paid Instantly for",
+    "headlineAccent": "Your Work",
+    "subheadline": "AgenticPay revolutionizes freelancer payments with blockchain technology. Get paid instantly, securely, and transparently.",
+    "activeProjects": "Active Projects",
+    "paidInvoices": "Paid Invoices",
+    "completedPayments": "Completed Payments",
+    "volumeSettled": "Volume Settled"
+  },
+  "auth": {
+    "title": "Welcome to AgenticPay",
+    "subtitle": "Get paid instantly for your work",
+    "socialLogin": "Social Login",
+    "walletConnect": "Wallet Connect"
+  },
+  "dashboard": {
+    "title": "Dashboard",
+    "welcome": "Welcome back! Here's your overview.",
+    "openMenu": "Open menu",
+    "closeMenu": "Close menu"
+  },
+  "bridgeMonitor": {
+    "title": "Bridge Monitoring",
+    "subtitle": "Track cross-chain message lifecycle and bridge health",
+    "health": "Bridge Health",
+    "totalMessages": "Total Messages",
+    "successRate": "Success Rate",
+    "avgLatency": "Avg Latency",
+    "stuckMessages": "Stuck Messages",
+    "pendingAlerts": "Pending Alerts",
+    "byProvider": "By Provider",
+    "volume": "Volume",
+    "latency": "Latency",
+    "retry": "Retry",
+    "refresh": "Refresh"
+  },
+  "upgradeSafety": {
+    "title": "Upgrade Safety",
+    "subtitle": "Pre-deployment validation results and upgrade history",
+    "passed": "Passed",
+    "failed": "Failed",
+    "rolledBack": "Rolled Back",
+    "history": "Upgrade History",
+    "historyDesc": "Storage layout checks, fork simulation, and smoke test results",
+    "empty": "No upgrade validations recorded yet.",
+    "simulation": "Simulation",
+    "smokeTests": "Smoke Tests",
+    "adminPreserved": "Admin Preserved",
+    "proxyAdmin": "Proxy Admin",
+    "implementation": "Implementation",
+    "refresh": "Refresh"
+  },
+  "i18nAdmin": {
+    "title": "Translation Management",
+    "subtitle": "Review missing keys and translation coverage",
+    "locale": "Locale",
+    "missingKeys": "Missing Keys",
+    "coverage": "Coverage",
+    "namespace": "Namespace"
+  },
+  "metadata": {
+    "title": "AgenticPay - Get Paid Instantly for Your Work",
+    "description": "Secure, fast, and transparent payments for freelancers powered by blockchain technology."
+  }
+}
diff --git a/frontend/messages/es.json b/frontend/messages/es.json
new file mode 100644
index 00000000..a371ec5c
--- /dev/null
+++ b/frontend/messages/es.json
@@ -0,0 +1,96 @@
+{
+  "common": {
+    "appName": "AgenticPay",
+    "loading": "Cargando…",
+    "save": "Guardar",
+    "cancel": "Cancelar",
+    "error": "Algo salió mal",
+    "retry": "Reintentar",
+    "getStarted": "Comenzar",
+    "learnMore": "Saber más"
+  },
+  "nav": {
+    "dashboard": "Panel",
+    "projects": "Proyectos",
+    "invoices": "Facturas",
+    "payments": "Pagos",
+    "qrPay": "Pago QR / NFC",
+    "disputes": "Disputas",
+    "bridgeMonitoring": "Monitoreo de puentes",
+    "archival": "Archivo en cadena",
+    "upgradeSafety": "Seguridad de actualizaciones",
+    "translations": "Traducciones",
+    "features": "Funciones",
+    "about": "Acerca de",
+    "pricing": "Precios"
+  },
+  "language": {
+    "changeLanguage": "Cambiar idioma",
+    "resetToBrowser": "Restablecer al idioma del navegador"
+  },
+  "landing": {
+    "badge": "Seguro / Rápido / Transparente",
+    "headline": "Cobra al instante por",
+    "headlineAccent": "tu trabajo",
+    "subheadline": "AgenticPay revoluciona los pagos freelance con blockchain.",
+    "activeProjects": "Proyectos activos",
+    "paidInvoices": "Facturas pagadas",
+    "completedPayments": "Pagos completados",
+    "volumeSettled": "Volumen liquidado"
+  },
+  "auth": {
+    "title": "Bienvenido a AgenticPay",
+    "subtitle": "Cobra al instante por tu trabajo",
+    "socialLogin": "Inicio social",
+    "walletConnect": "Billetera Web3"
+  },
+  "dashboard": {
+    "title": "Panel",
+    "welcome": "¡Bienvenido de nuevo! Aquí está tu resumen.",
+    "openMenu": "Abrir menú",
+    "closeMenu": "Cerrar menú"
+  },
+  "bridgeMonitor": {
+    "title": "Monitoreo de puentes",
+    "subtitle": "Seguimiento del ciclo de vida de mensajes entre cadenas",
+    "health": "Salud del puente",
+    "totalMessages": "Mensajes totales",
+    "successRate": "Tasa de éxito",
+    "avgLatency": "Latencia promedio",
+    "stuckMessages": "Mensajes atascados",
+    "pendingAlerts": "Alertas pendientes",
+    "byProvider": "Por proveedor",
+    "volume": "Volumen",
+    "latency": "Latencia",
+    "retry": "Reintentar",
+    "refresh": "Actualizar"
+  },
+  "upgradeSafety": {
+    "title": "Seguridad de actualizaciones",
+    "subtitle": "Validación pre-despliegue e historial",
+    "passed": "Aprobado",
+    "failed": "Fallido",
+    "rolledBack": "Revertido",
+    "history": "Historial",
+    "historyDesc": "Comprobaciones de almacenamiento y simulación",
+    "empty": "Sin validaciones registradas.",
+    "simulation": "Simulación",
+    "smokeTests": "Pruebas",
+    "adminPreserved": "Admin preservado",
+    "proxyAdmin": "Proxy admin",
+    "implementation": "Implementación",
+    "refresh": "Actualizar"
+  },
+  "i18nAdmin": {
+    "title": "Gestión de traducciones",
+    "subtitle": "Revisar claves faltantes y cobertura de traducción",
+    "locale": "Idioma",
+    "missingKeys": "Claves faltantes",
+    "coverage": "Cobertura",
+    "namespace": "Espacio de nombres"
+  },
+  "metadata": {
+    "title": "AgenticPay - Cobrá al instante por tu trabajo",
+    "description": "Pagos seguros, rápidos y transparentes para freelancers con tecnología blockchain."
+  }
+}
diff --git a/frontend/messages/fr.json b/frontend/messages/fr.json
new file mode 100644
index 00000000..74a47770
--- /dev/null
+++ b/frontend/messages/fr.json
@@ -0,0 +1,96 @@
+{
+  "common": {
+    "appName": "AgenticPay",
+    "loading": "Chargement…",
+    "save": "Enregistrer",
+    "cancel": "Annuler",
+    "error": "Une erreur s'est produite",
+    "retry": "Réessayer",
+    "getStarted": "Commencer",
+    "learnMore": "En savoir plus"
+  },
+  "nav": {
+    "dashboard": "Tableau de bord",
+    "projects": "Projets",
+    "invoices": "Factures",
+    "payments": "Paiements",
+    "qrPay": "Paiement QR / NFC",
+    "disputes": "Litiges",
+    "bridgeMonitoring": "Surveillance des ponts",
+    "archival": "Archivage on-chain",
+    "upgradeSafety": "Sécurité des mises à jour",
+    "translations": "Traductions",
+    "features": "Fonctionnalités",
+    "about": "À propos",
+    "pricing": "Tarifs"
+  },
+  "language": {
+    "changeLanguage": "Changer de langue",
+    "resetToBrowser": "Réinitialiser selon le navigateur"
+  },
+  "landing": {
+    "badge": "Sécurisé / Rapide / Transparent",
+    "headline": "Soyez payé instantanément pour",
+    "headlineAccent": "votre travail",
+    "subheadline": "AgenticPay révolutionne les paiements freelance avec la blockchain.",
+    "activeProjects": "Projets actifs",
+    "paidInvoices": "Factures payées",
+    "completedPayments": "Paiements terminés",
+    "volumeSettled": "Volume réglé"
+  },
+  "auth": {
+    "title": "Bienvenue sur AgenticPay",
+    "subtitle": "Soyez payé instantanément",
+    "socialLogin": "Connexion sociale",
+    "walletConnect": "Portefeuille Web3"
+  },
+  "dashboard": {
+    "title": "Tableau de bord",
+    "welcome": "Bon retour ! Voici votre aperçu.",
+    "openMenu": "Ouvrir le menu",
+    "closeMenu": "Fermer le menu"
+  },
+  "bridgeMonitor": {
+    "title": "Surveillance des ponts",
+    "subtitle": "Suivi du cycle de vie des messages inter-chaînes",
+    "health": "Santé du pont",
+    "totalMessages": "Messages totaux",
+    "successRate": "Taux de réussite",
+    "avgLatency": "Latence moyenne",
+    "stuckMessages": "Messages bloqués",
+    "pendingAlerts": "Alertes en attente",
+    "byProvider": "Par fournisseur",
+    "volume": "Volume",
+    "latency": "Latence",
+    "retry": "Réessayer",
+    "refresh": "Actualiser"
+  },
+  "upgradeSafety": {
+    "title": "Sécurité des mises à jour",
+    "subtitle": "Validation pré-déploiement et historique",
+    "passed": "Réussi",
+    "failed": "Échoué",
+    "rolledBack": "Annulé",
+    "history": "Historique",
+    "historyDesc": "Vérifications de stockage et simulation",
+    "empty": "Aucune validation enregistrée.",
+    "simulation": "Simulation",
+    "smokeTests": "Tests",
+    "adminPreserved": "Admin préservé",
+    "proxyAdmin": "Proxy admin",
+    "implementation": "Implémentation",
+    "refresh": "Actualiser"
+  },
+  "i18nAdmin": {
+    "title": "Gestion des traductions",
+    "subtitle": "Examiner les clés manquantes et la couverture",
+    "locale": "Langue",
+    "missingKeys": "Clés manquantes",
+    "coverage": "Couverture",
+    "namespace": "Espace de noms"
+  },
+  "metadata": {
+    "title": "AgenticPay - Soyez payé instantanément pour votre travail",
+    "description": "Paiements sécurisés, rapides et transparents pour les freelances grâce à la blockchain."
+  }
+}
diff --git a/frontend/messages/ja.json b/frontend/messages/ja.json
new file mode 100644
index 00000000..0183490a
--- /dev/null
+++ b/frontend/messages/ja.json
@@ -0,0 +1,96 @@
+{
+  "common": {
+    "appName": "AgenticPay",
+    "loading": "読み込み中…",
+    "save": "保存",
+    "cancel": "キャンセル",
+    "error": "問題が発生しました",
+    "retry": "再試行",
+    "getStarted": "始める",
+    "learnMore": "詳しく見る"
+  },
+  "nav": {
+    "dashboard": "ダッシュボード",
+    "projects": "プロジェクト",
+    "invoices": "請求書",
+    "payments": "支払い",
+    "qrPay": "QR / NFC 決済",
+    "disputes": "紛争",
+    "bridgeMonitoring": "ブリッジ監視",
+    "archival": "オンチェーンアーカイブ",
+    "upgradeSafety": "アップグレード安全性",
+    "translations": "翻訳",
+    "features": "機能",
+    "about": "概要",
+    "pricing": "料金"
+  },
+  "language": {
+    "changeLanguage": "言語を変更",
+    "resetToBrowser": "ブラウザの設定に戻す"
+  },
+  "landing": {
+    "badge": "安全 / 高速 / 透明",
+    "headline": "仕事の対価を",
+    "headlineAccent": "即座に受け取る",
+    "subheadline": "AgenticPayはブロックチェーンでフリーランサー決済を革新します。",
+    "activeProjects": "アクティブプロジェクト",
+    "paidInvoices": "支払済請求書",
+    "completedPayments": "完了した支払い",
+    "volumeSettled": "決済量"
+  },
+  "auth": {
+    "title": "AgenticPayへようこそ",
+    "subtitle": "仕事の対価を即座に受け取る",
+    "socialLogin": "ソーシャルログイン",
+    "walletConnect": "Web3ウォレット"
+  },
+  "dashboard": {
+    "title": "ダッシュボード",
+    "welcome": "おかえりなさい！概要はこちらです。",
+    "openMenu": "メニューを開く",
+    "closeMenu": "メニューを閉じる"
+  },
+  "bridgeMonitor": {
+    "title": "ブリッジ監視",
+    "subtitle": "クロスチェーンメッセージのライフサイクルと健全性を追跡",
+    "health": "ブリッジの健全性",
+    "totalMessages": "総メッセージ数",
+    "successRate": "成功率",
+    "avgLatency": "平均レイテンシ",
+    "stuckMessages": "滞留メッセージ",
+    "pendingAlerts": "未確認アラート",
+    "byProvider": "プロバイダ別",
+    "volume": "ボリューム",
+    "latency": "レイテンシ",
+    "retry": "再試行",
+    "refresh": "更新"
+  },
+  "upgradeSafety": {
+    "title": "アップグレード安全性",
+    "subtitle": "デプロイ前検証と履歴",
+    "passed": "合格",
+    "failed": "不合格",
+    "rolledBack": "ロールバック",
+    "history": "履歴",
+    "historyDesc": "ストレージレイアウトとシミュレーション",
+    "empty": "検証記録がありません。",
+    "simulation": "シミュレーション",
+    "smokeTests": "スモークテスト",
+    "adminPreserved": "管理者維持",
+    "proxyAdmin": "プロキシ管理者",
+    "implementation": "実装",
+    "refresh": "更新"
+  },
+  "i18nAdmin": {
+    "title": "翻訳管理",
+    "subtitle": "不足キーと翻訳カバレッジを確認",
+    "locale": "ロケール",
+    "missingKeys": "不足キー",
+    "coverage": "カバレッジ",
+    "namespace": "名前空間"
+  },
+  "metadata": {
+    "title": "AgenticPay - 仕事の対価を即座に受け取る",
+    "description": "ブロックチェーン技術による、安全で迅速かつ透明なフリーランサー向け決済。"
+  }
+}
diff --git a/frontend/middleware.ts b/frontend/middleware.ts
new file mode 100644
index 00000000..a3dc6176
--- /dev/null
+++ b/frontend/middleware.ts
@@ -0,0 +1,8 @@
+import createMiddleware from 'next-intl/middleware';
+import { routing } from './i18n/routing';
+
+export default createMiddleware(routing);
+
+export const config = {
+  matcher: ['/', '/(en|es|fr|ja|ar)/:path*', '/((?!api|_next|_vercel|.*\\..*).*)'],
+};
diff --git a/frontend/next.config.ts b/frontend/next.config.ts
index bff84a93..b20f76de 100644
--- a/frontend/next.config.ts
+++ b/frontend/next.config.ts
@@ -1,6 +1,9 @@
 import type { NextConfig } from "next";
 import withBundleAnalyzer from "@next/bundle-analyzer";
 import { withSentryConfig } from "@sentry/nextjs";
+import createNextIntlPlugin from "next-intl/plugin";
+
+const withNextIntl = createNextIntlPlugin("./i18n/request.ts");
 
 const bundleAnalyzer = withBundleAnalyzer({
   enabled: process.env.ANALYZE === "true",
@@ -248,7 +251,7 @@ const nextConfig: NextConfig = {
   },
 };
 
-export default withSentryConfig(bundleAnalyzer(nextConfig), {
+export default withSentryConfig(bundleAnalyzer(withNextIntl(nextConfig)), {
   silent: true,
   org: process.env.SENTRY_ORG || "agenticpay",
   project: process.env.SENTRY_PROJECT || "agenticpay-frontend",
diff --git a/frontend/package.json b/frontend/package.json
index 0b671268..b7996952 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -16,7 +16,9 @@
     "test:e2e:update-snapshots": "playwright test --update-snapshots",
     "test:e2e:report": "playwright show-report",
     "generate:api-hooks": "node ../packages/api-hooks-generator/dist/cli.js",
-    "generate:api-hooks:watch": "node ../packages/api-hooks-generator/dist/cli.js --watch"
+    "generate:api-hooks:watch": "node ../packages/api-hooks-generator/dist/cli.js --watch",
+    "i18n:sync": "tsx scripts/sync-translations.ts",
+    "i18n:check": "tsx scripts/check-translations.ts"
   },
   "dependencies": {
     "@agenticpay/types": "*",
@@ -34,6 +36,7 @@
     "@radix-ui/react-dropdown-menu": "^2.1.16",
     "@radix-ui/react-label": "^2.1.8",
     "@radix-ui/react-popover": "^1.1.15",
+    "@radix-ui/react-progress": "^1.1.7",
     "@radix-ui/react-select": "^2.2.6",
     "@radix-ui/react-slot": "^1.2.4",
     "@radix-ui/react-tabs": "^1.1.13",
@@ -54,6 +57,7 @@
     "jsqr": "^1.4.0",
     "lucide-react": "^0.562.0",
     "next": "^16.2.1",
+    "next-intl": "^4.13.0",
     "next-themes": "^0.4.6",
     "qrcode.react": "^4.2.0",
     "react": "^19.2.3",
diff --git a/frontend/scripts/check-translations.ts b/frontend/scripts/check-translations.ts
new file mode 100644
index 00000000..5b0f8a95
--- /dev/null
+++ b/frontend/scripts/check-translations.ts
@@ -0,0 +1,67 @@
+#!/usr/bin/env tsx
+/**
+ * Validates translation file parity against en.json — Issue #476
+ */
+
+import { readFileSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
+
+const ROOT = join(__dirname, '..');
+const MESSAGES_DIR = join(ROOT, 'messages');
+const SOURCE = 'en';
+const TARGETS = ['es', 'fr', 'ja', 'ar'];
+
+type Messages = Record<string, unknown>;
+
+function loadMessages(locale: string): Messages {
+  const path = join(MESSAGES_DIR, `${locale}.json`);
+  if (!existsSync(path)) throw new Error(`Missing messages file: ${path}`);
+  return JSON.parse(readFileSync(path, 'utf-8')) as Messages;
+}
+
+function flattenKeys(obj: Messages, prefix = ''): string[] {
+  const keys: string[] = [];
+  for (const [key, value] of Object.entries(obj)) {
+    const path = prefix ? `${prefix}.${key}` : key;
+    if (value && typeof value === 'object' && !Array.isArray(value)) {
+      keys.push(...flattenKeys(value as Messages, path));
+    } else {
+      keys.push(path);
+    }
+  }
+  return keys;
+}
+
+function main(): void {
+  const source = loadMessages(SOURCE);
+  const sourceKeys = flattenKeys(source);
+  let failed = false;
+
+  for (const locale of TARGETS) {
+    const target = loadMessages(locale);
+    const targetKeys = new Set(flattenKeys(target));
+    const missing = sourceKeys.filter((k) => !targetKeys.has(k));
+    const extra = [...targetKeys].filter((k) => !sourceKeys.includes(k));
+
+    if (missing.length > 0) {
+      failed = true;
+      console.error(`[i18n:check] ${locale}: missing ${missing.length} key(s)`);
+      for (const key of missing.slice(0, 20)) {
+        console.error(`  - ${key}`);
+      }
+      if (missing.length > 20) console.error(`  …and ${missing.length - 20} more`);
+    }
+
+    if (extra.length > 0) {
+      console.warn(`[i18n:check] ${locale}: ${extra.length} extra key(s) not in en.json`);
+    }
+
+    if (missing.length === 0) {
+      console.log(`[i18n:check] ${locale}: OK (${sourceKeys.length} keys)`);
+    }
+  }
+
+  if (failed) process.exit(1);
+}
+
+main();
diff --git a/frontend/scripts/sync-translations.ts b/frontend/scripts/sync-translations.ts
new file mode 100644
index 00000000..d616ee5a
--- /dev/null
+++ b/frontend/scripts/sync-translations.ts
@@ -0,0 +1,109 @@
+#!/usr/bin/env tsx
+/**
+ * Automated translation pipeline — Issue #476
+ *
+ * Syncs missing keys from en.json to target locales via DeepL API.
+ * Usage: DEEPL_API_KEY=... npx tsx scripts/sync-translations.ts
+ */
+
+import { readFileSync, writeFileSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
+
+const ROOT = join(__dirname, '..');
+const MESSAGES_DIR = join(ROOT, 'messages');
+const SOURCE_LOCALE = 'en';
+const TARGET_LOCALES = ['es', 'fr', 'ja', 'ar'];
+
+type Messages = Record<string, unknown>;
+
+function loadMessages(locale: string): Messages {
+  const path = join(MESSAGES_DIR, `${locale}.json`);
+  if (!existsSync(path)) return {};
+  return JSON.parse(readFileSync(path, 'utf-8')) as Messages;
+}
+
+function saveMessages(locale: string, messages: Messages): void {
+  writeFileSync(join(MESSAGES_DIR, `${locale}.json`), JSON.stringify(messages, null, 2) + '\n');
+}
+
+function getNested(obj: Messages, path: string[]): unknown {
+  let current: unknown = obj;
+  for (const key of path) {
+    if (!current || typeof current !== 'object') return undefined;
+    current = (current as Messages)[key];
+  }
+  return current;
+}
+
+function setNested(obj: Messages, path: string[], value: string): void {
+  let current = obj;
+  for (let i = 0; i < path.length - 1; i++) {
+    const key = path[i]!;
+    if (!current[key] || typeof current[key] !== 'object') {
+      current[key] = {};
+    }
+    current = current[key] as Messages;
+  }
+  current[path[path.length - 1]!] = value;
+}
+
+function collectLeafPaths(obj: Messages, prefix: string[] = []): Array<{ path: string[]; value: string }> {
+  const leaves: Array<{ path: string[]; value: string }> = [];
+  for (const [key, value] of Object.entries(obj)) {
+    const path = [...prefix, key];
+    if (value && typeof value === 'object' && !Array.isArray(value)) {
+      leaves.push(...collectLeafPaths(value as Messages, path));
+    } else if (typeof value === 'string') {
+      leaves.push({ path, value });
+    }
+  }
+  return leaves;
+}
+
+async function translateText(text: string, targetLang: string): Promise<string> {
+  const apiKey = process.env.DEEPL_API_KEY;
+  if (!apiKey) return text;
+
+  const res = await fetch('https://api-free.deepl.com/v2/translate', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    body: new URLSearchParams({
+      auth_key: apiKey,
+      text,
+      target_lang: targetLang.toUpperCase(),
+    }),
+  });
+
+  if (!res.ok) {
+    console.warn(`[i18n] DeepL failed for "${text.slice(0, 40)}": ${res.status}`);
+    return text;
+  }
+
+  const body = (await res.json()) as { translations?: Array<{ text: string }> };
+  return body.translations?.[0]?.text ?? text;
+}
+
+async function main(): Promise<void> {
+  const source = loadMessages(SOURCE_LOCALE);
+  const sourceLeaves = collectLeafPaths(source);
+
+  for (const locale of TARGET_LOCALES) {
+    const target = loadMessages(locale);
+    let updated = 0;
+
+    for (const leaf of sourceLeaves) {
+      if (getNested(target, leaf.path) !== undefined) continue;
+      const translated = await translateText(leaf.value, locale);
+      setNested(target, leaf.path, translated);
+      updated++;
+    }
+
+    saveMessages(locale, target);
+    console.log(`[i18n] ${locale}: added ${updated} missing key(s)`);
+  }
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});
diff --git a/package-lock.json b/package-lock.json
index 857aaaab..11fd41a2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,13 +12,14 @@
         "workers"
       ],
       "dependencies": {
-        "@rollup/rollup-linux-x64-gnu": "*"
+        "lightningcss": "^1.32.0"
       },
       "devDependencies": {
         "turbo": "^1.10.16"
       },
       "optionalDependencies": {
-        "@rollup/rollup-linux-x64-gnu": "^4.62.2"
+        "@rollup/rollup-linux-x64-gnu": "^4.62.2",
+        "lightningcss-linux-x64-gnu": "^1.32.0"
       }
     },
     "backend": {
@@ -136,6 +137,7 @@
         "@radix-ui/react-dropdown-menu": "^2.1.16",
         "@radix-ui/react-label": "^2.1.8",
         "@radix-ui/react-popover": "^1.1.15",
+        "@radix-ui/react-progress": "^1.1.7",
         "@radix-ui/react-select": "^2.2.6",
         "@radix-ui/react-slot": "^1.2.4",
         "@radix-ui/react-tabs": "^1.1.13",
@@ -156,6 +158,7 @@
         "jsqr": "^1.4.0",
         "lucide-react": "^0.562.0",
         "next": "^16.2.1",
+        "next-intl": "^4.13.0",
         "next-themes": "^0.4.6",
         "qrcode.react": "^4.2.0",
         "react": "^19.2.3",
@@ -2649,6 +2652,36 @@
       "version": "0.2.11",
       "license": "MIT"
     },
+    "node_modules/@formatjs/fast-memoize": {
+      "version": "3.1.6",
+      "resolved": "https://registry.npmjs.org/@formatjs/fast-memoize/-/fast-memoize-3.1.6.tgz",
+      "integrity": "sha512-H5aexk1Le7T9TPmscacZ+1pR6CTa2n1wq+HDVGXhH8TzUlQQpeXzZs91dRtmFHrbeNbjPFPfQujUqm7MHgVoXQ==",
+      "license": "MIT"
+    },
+    "node_modules/@formatjs/icu-messageformat-parser": {
+      "version": "3.5.12",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-3.5.12.tgz",
+      "integrity": "sha512-YyzzxVgYJ8DELmmkhn0Yr0rUj0dTJFf9Jp628K3S0ysInBWxLVDOS8i3RP91cCp4DMK4WYb4cVMhWA9i4knSJg==",
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/icu-skeleton-parser": "2.1.10"
+      }
+    },
+    "node_modules/@formatjs/icu-skeleton-parser": {
+      "version": "2.1.10",
+      "resolved": "https://registry.npmjs.org/@formatjs/icu-skeleton-parser/-/icu-skeleton-parser-2.1.10.tgz",
+      "integrity": "sha512-XuSva+8ZGawk8VnD5VD6UeH8KarQ/Z022zgjHDoHmlNiAewstXuuzXc0Hk5pGFSdG+nNw5bfJKXqj1ZXHn9yUA==",
+      "license": "MIT"
+    },
+    "node_modules/@formatjs/intl-localematcher": {
+      "version": "0.8.10",
+      "resolved": "https://registry.npmjs.org/@formatjs/intl-localematcher/-/intl-localematcher-0.8.10.tgz",
+      "integrity": "sha512-P/IC3qws3jH+1fEs+o0RIFgXKRaQlFehjS5W0FPAqdo6hgzawLl+eD0q0JjheQ3XtoOe5n8WSYfX06KQZI/QJA==",
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "3.1.6"
+      }
+    },
     "node_modules/@gerrit0/mini-shiki": {
       "version": "3.23.0",
       "resolved": "https://registry.npmjs.org/@gerrit0/mini-shiki/-/mini-shiki-3.23.0.tgz",
@@ -4155,6 +4188,319 @@
         "@opentelemetry/api": "^1.1.0"
       }
     },
+    "node_modules/@parcel/watcher": {
+      "version": "2.5.6",
+      "resolved": "https://registry.npmjs.org/@parcel/watcher/-/watcher-2.5.6.tgz",
+      "integrity": "sha512-tmmZ3lQxAe/k/+rNnXQRawJ4NjxO2hqiOLTHvWchtGZULp4RyFeh6aU4XdOYBFe2KE1oShQTv4AblOs2iOrNnQ==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "detect-libc": "^2.0.3",
+        "is-glob": "^4.0.3",
+        "node-addon-api": "^7.0.0",
+        "picomatch": "^4.0.3"
+      },
+      "engines": {
+        "node": ">= 10.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/parcel"
+      },
+      "optionalDependencies": {
+        "@parcel/watcher-android-arm64": "2.5.6",
+        "@parcel/watcher-darwin-arm64": "2.5.6",
+        "@parcel/watcher-darwin-x64": "2.5.6",
+        "@parcel/watcher-freebsd-x64": "2.5.6",
+        "@parcel/watcher-linux-arm-glibc": "2.5.6",
+        "@parcel/watcher-linux-arm-musl": "2.5.6",
+        "@parcel/watcher-linux-arm64-glibc": "2.5.6",
+        "@parcel/watcher-linux-arm64-musl": "2.5.6",
+        "@parcel/watcher-linux-x64-glibc": "2.5.6",
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       "license": "MIT",
@@ -22544,6 +23518,7 @@
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
       "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
       "optional": true,
@@ -22570,6 +23545,12 @@
         "node": ">=10.13.0"
       }
     },
+    "node_modules/po-parser": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/po-parser/-/po-parser-2.1.1.tgz",
+      "integrity": "sha512-ECF4zHLbUItpUgE3OTtLKlPjeBN+fKEczj2zYjDfCGOzicNs0GK3Vg2IoAYwx7LH/XYw43fZQP6xnZ4TkNxSLQ==",
+      "license": "MIT"
+    },
     "node_modules/pony-cause": {
       "version": "2.1.11",
       "license": "0BSD",
@@ -25810,6 +26791,27 @@
         }
       }
     },
+    "node_modules/use-intl": {
+      "version": "4.13.0",
+      "resolved": "https://registry.npmjs.org/use-intl/-/use-intl-4.13.0.tgz",
+      "integrity": "sha512-fAFDrWaASxlhXOipcOyb5VDD+YONqj6+8O8EcG/J7RBoOUF3A8YahRWLN+mBxYMrlMQB8N6Voqk5X+YC+HSL0A==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/amannn"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@formatjs/fast-memoize": "^3.1.0",
+        "@schummar/icu-type-parser": "1.21.5",
+        "icu-minify": "^4.13.0",
+        "intl-messageformat": "^11.1.0"
+      },
+      "peerDependencies": {
+        "react": "^17.0.0 || ^18.0.0 || >=19.0.0-rc <19.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/use-sidecar": {
       "version": "1.1.3",
       "license": "MIT",
diff --git a/package.json b/package.json
index 59015a86..851adaf0 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,10 @@
     "turbo": "^1.10.16"
   },
   "optionalDependencies": {
-    "@rollup/rollup-linux-x64-gnu": "^4.62.2"
+    "@rollup/rollup-linux-x64-gnu": "^4.62.2",
+    "lightningcss-linux-x64-gnu": "^1.32.0"
+  },
+  "dependencies": {
+    "lightningcss": "^1.32.0"
   }
 }