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Selling APIs to AI agents with x402: 69 endpoints, Cloudflare Workers, zero API keys

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

The pitch An AI agent needs the EUR/EGP rate. It calls GET /v1/fx/EUR . The server answers 402 Payment Required with a price ($0.01) and a wallet. The agent signs a USDC transfer on Base, retries with an X-PAYMENT header, gets JSON. No signup, no API key, no invoice. That's x402. I spent two nights…

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  1. 2026-10-20 12:48 · DEV Community — AI
    Selling APIs to AI agents with x402: 69 endpoints, Cloudflare Workers, zero API keys

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