Show HN: X402 integrations for an AI-agent data API, checked in a clean room

Category: library

Tags: langchain, x402, payments, ai-agents, usdc

Score: 4.5/10 (Innovation: 3, Technical: 5, Documentation: 7, Utility: 3)

A LangChain.js tool that wraps a single Blockchain IQ x402 paid API endpoint, handling the EIP-3009 USDC payment handshake with a strict policy and injected wallet callback. It is a narrow, single-endpoint adapter rather than a general x402 framework, though the payment-policy hardening and clean-room smoke-testing are thoughtfully done.

Target audience: ai-agent developers and backend engineers integrating paid APIs

Repository: https://www.blockchainiq.co/blog/x402-integrations-from-the-build-bounty · JavaScript · MIT

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