chore: release as 0.4.0 (sandbox/testnet preview)

README.md

@@ -3,6 +3,11 @@
 Official TypeScript and Python SDKs for the **Hashlock Markets** developer API — non-custodial
 cross-chain atomic swaps (**BTC ↔ EVM / TRON**) over sealed RFQ + HTLC.
 
+> ⚠️ **Sandbox / testnet preview (0.x).** The SDK defaults to the public sandbox
+> (`api-dev.hashlock.markets`) and targets **testnets only** — pre-mainnet, pre-external-audit. The API
+> surface may still change before the stable `1.0` release, which will accompany mainnet. Don't use with
+> mainnet funds.
+
 - **Non-custodial.** Settlement endpoints return *unsigned* transactions. You sign with your own key or
   HSM; the server never holds your keys.
 - **Native, no bridge.** Real BTC ↔ real EVM/TRON assets, settled directly via HTLC — no wrapped tokens,

python/README.md

@@ -3,6 +3,9 @@
 Python SDK for the [Hashlock Markets](https://github.com/Hashlock-Tech/hashlock-sdk) developer API —
 non-custodial cross-chain atomic swaps (BTC ↔ EVM/TRON). Python 3.9+, built on `httpx`.
 
+> ⚠️ **Sandbox / testnet preview (0.x)** — defaults to `api-dev.hashlock.markets`, testnets only,
+> pre-mainnet. The API may change before the stable `1.0`. Not for mainnet funds.
+
 ```bash
 pip install hashlock-sdk          # add [ws] for the maker WebSocket feed: hashlock-sdk[ws]
 ```

python/hashlock/__init__.py

@@ -5,4 +5,4 @@
 from .webhooks import verify_webhook
 
 __all__ = ["HashlockClient", "HashlockError", "new_secret", "sha256_hex", "verify_webhook"]
-__version__ = "1.0.0"
+__version__ = "0.4.0"

python/pyproject.toml

@@ -4,12 +4,21 @@ build-backend = "hatchling.build"
 
 [project]
 name = "hashlock-sdk"
-version = "1.0.0"
+version = "0.4.0"
 description = "Python SDK for the Hashlock Markets developer API — non-custodial cross-chain atomic swaps (BTC <-> EVM/TRON) over sealed RFQ + HTLC."
 readme = "README.md"
 license = { text = "MIT" }
 requires-python = ">=3.9"
 keywords = ["hashlock", "atomic-swap", "htlc", "bitcoin", "cross-chain", "otc", "defi"]
+classifiers = [
+  "Development Status :: 4 - Beta",
+  "License :: OSI Approved :: MIT License",
+  "Intended Audience :: Developers",
+  "Intended Audience :: Financial and Insurance Industry",
+  "Programming Language :: Python :: 3",
+  "Topic :: Software Development :: Libraries :: Python Modules",
+  "Topic :: Office/Business :: Financial",
+]
 dependencies = ["httpx>=0.24"]
 
 [project.optional-dependencies]

typescript/README.md

@@ -4,6 +4,9 @@ TypeScript SDK for the [Hashlock Markets](https://github.com/Hashlock-Tech/hashl
 non-custodial cross-chain atomic swaps (BTC ↔ EVM/TRON). Runs on Node 18+, browsers, and edge runtimes
 (native `fetch` / `WebSocket`, zero runtime dependencies).
 
+> ⚠️ **Sandbox / testnet preview (0.x)** — defaults to `api-dev.hashlock.markets`, testnets only,
+> pre-mainnet. The API may change before the stable `1.0`. Not for mainnet funds.
+
 ```bash
 npm i @hashlock-tech/sdk
 ```

typescript/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hashlock-tech/sdk",
-  "version": "1.0.0",
+  "version": "0.4.0",
   "description": "TypeScript SDK for the Hashlock Markets developer API — non-custodial cross-chain atomic swaps (BTC ↔ EVM/TRON) over sealed RFQ + HTLC.",
   "license": "MIT",
   "type": "module",