Show HN: X402-express. Pay-per-call HTTP 402 middleware for AI agents on Base L2

Category: infrastructure

Tags: ai-agents, pay-per-call, express-middleware

Score: 6.8/10 (Innovation: 6, Technical: 7, Documentation: 7, Utility: 7)

X402-express is an ultra-lightweight middleware for Express.js that implements the x402 payment protocol, enabling AI agents to pay per API call via USDC micro-transactions on Base L2. It uses gasless EIP-3009 authorization and atomic on-chain settlement, making it a practical bridge between AI services and blockchain payments.

Target audience: backend devs, ai engineers, blockchain developers

Repository: https://github.com/Evozim/m2mcent-sdk · TypeScript · MIT

View on Hacker News