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Fixes Summary - Alchemy Integration Issues

Issues Fixed

Issue 1: Token Amount Display ✅

Problem: Showing dollar value instead of token count Status: Already correct in code Code: Number(amount) / 1e18 in ResultsView.tsx Note: The display should show token amounts. If you're seeing dollar values, it might be a different issue.

Issue 2: Not Finding Source ✅ FIXED

Problem: Couldn't find incoming transfers even though they exist on Basescan Root Cause: Was searching from fromBlock instead of from block 0 Fix: Changed to search from genesis block (0x0)

Before:

fromBlock: `0x${fromBlock.toString(16)}`, // Only searched recent blocks

After:

fromBlock: '0x0', // Search ALL history from genesis

This ensures we find transfers no matter how old they are.

Issue 3: Alchemy SDK Parameters ✅ FIXED

Problem: Incorrect parameters for Alchemy API Fixes Applied:

  1. Network Mapping: Added proper Base network support
'base-mainnet': Network.BASE_MAINNET,
  1. Sorting Order: Fixed type error
order: SortingOrder.ASCENDING, // Was: 'asc' (wrong type)
  1. Decimal Handling: Properly parse token decimals
const decimals = parseInt(transfer.rawContract.decimal || '0x12', 16);
const rawValue = ethers.parseUnits(transfer.value.toString(), decimals);
  1. Search Range: Always search from block 0
fromBlock: '0x0', // Start from genesis
toBlock: `0x${toBlock.toString(16)}`, // Up to current block

Enhanced Logging

Added detailed logging to help debug:

this.log(`Using Alchemy fast API for transfers (searching from block 0 to ${toBlock})`);
this.log(`Alchemy API returned ${response.transfers.length} transfers instantly`);
this.log(`  Transfer: ${from}... → ${to}... (${value} tokens, block ${blockNum})`);
this.log(`⚠️ No transfers found for ${address}... - wallet may have never received this token`);
this.log(`❌ Alchemy API failed: ${error}`);

What You Should See Now

In the Logs:

Using Alchemy fast API for transfers (searching from block 0 to 36230279)
Alchemy API returned 5 transfers instantly
  Transfer: 0x1234... → 0x4735... (100.5 tokens, block 35000000)
  Transfer: 0x5678... → 0x4735... (50.2 tokens, block 35500000)
  ...

If No Transfers Found:

⚠️ No transfers found for 0x4735... - wallet may have never received this token

This means:

  • The wallet never received this specific token, OR
  • The token address is incorrect, OR
  • There's an API issue (will fall back to RPC)

Testing Checklist

  1. ✅ Search starts from block 0 (finds old transfers)
  2. ✅ Proper network mapping for Base
  3. ✅ Correct decimal handling
  4. ✅ Detailed logging for debugging
  5. ✅ Fallback to RPC if Alchemy fails

Common Issues & Solutions

"Unknown" Origin

Possible Causes:

  1. Wallet never received tokens (check Basescan)
  2. Seller is a contract (stops at contract)
  3. API returned 0 transfers
  4. Wrong token address

Debug Steps:

  1. Check detailed logs (expand "Show Details")
  2. Verify token address is correct
  3. Check if seller address exists on Basescan
  4. Verify network is correct (base-mainnet)

"Over 55 years ago"

Cause: Timestamp is 0 (not fetched) Status: Known issue - timestamps not critical for tracing Fix: Can be added if needed

Alchemy API Fails

Fallback: Automatically uses standard RPC Log: "Falling back to standard RPC method..." Impact: Slower but still works

Network Configuration

Make sure your Alchemy configuration uses:

  • Network: base-mainnet (for Base)
  • API Key: Your Alchemy API key
  • Provider: alchemy

The app will automatically map this to Network.BASE_MAINNET in the SDK.

Next Steps

  1. Clear browser cache and reload
  2. Check detailed logs (click "Show Details")
  3. Verify token address is correct
  4. Ensure network is set to "base-mainnet"
  5. Check if transfers exist on Basescan for that wallet + token

Example Debug Output

12:30:00 - Initializing Blockchain Service
Provider: alchemy, Block Range: 10

12:30:00 - Alchemy SDK initialized for fast transfers API

12:30:01 - Token Tracer
[Depth 0] Tracing wallet 0x4735...1fc7 at block 36230279

12:30:01 - Token Tracer
[Depth 0] Searching for first incoming transfer to 0x4735...1fc7...

12:30:01 - Blockchain API
Using Alchemy fast API for transfers (searching from block 0 to 36230279)

12:30:02 - Blockchain API
Alchemy API returned 3 transfers instantly

12:30:02 - Blockchain API
  Transfer: 0xabcd... → 0x4735... (213.5653 tokens, block 35123456)

12:30:02 - Token Tracer
  Found 3 incoming transfer(s) for 0x4735...1fc7

12:30:02 - Token Tracer
[Depth 0] Found transfer from 0xabcd... at block 35123456

12:30:02 - Token Tracer
[Depth 0] → Recursively tracing 0xabcd...

If you see "0 transfers" but Basescan shows transfers, there's likely a mismatch in:

  • Token address
  • Network
  • Wallet address