I built an Express API that AI agents (or humans, or anything with fetch ) can pay per call, in USDC, with no signup and no API key. It's live on Base mainnet with 27 paid endpoints, and I've run real settled transactions against it. This is the technical walkthrough — the code, the protocol, a...
Source: [Dev.to](https://dev.to/entreprisedaney33rgb/i-built-an-api-that-ai-agents-pay-in-usdc-full-x402-walkthrough-27-endpoints-real-transactions-44jn)