A LangChain research agent that pays for data from x402 endpoints. Every payment audited by Sentinel.

1. Agent receives a research task
2. Uses x402 endpoints to fetch paid data
3. All payments tracked with full audit trails
4. Budget limits prevent overspending
5. Cryptographic receipt for every payment

git clone https://github.com/valeo-cash/x402-langchain-agent
cd x402-langchain-agent
cp .env.example .env  # Add your API keys
npm install
npm start

OPENAI_API_KEY=your-openai-key
SENTINEL_API_KEY=your-sentinel-key  # optional

Open sentinel.valeocash.com to see every payment your LangChain agent made — amount, endpoint, tx hash, receipt.

npx @x402sentinel/test https://your-endpoint.com

Verify your x402 endpoints are correctly configured before going to production.

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