I Built an API That AI Agents Pay in USDC — Full x402 Walkthrough (27 Endpoints, Real Transactions)
This story is from 2026-09-01. It is preserved in the archive; the latest stories are on the live feed.
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, and t…
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- 2026-09-01 20:48 · DEV Community — AI
I Built an API That AI Agents Pay in USDC — Full x402 Walkthrough (27 Endpoints, Real Transactions)