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HTTP 402 is not reserved for future use anymore: I put a 1-cent paywall on a live API for AI agents

This story is from 2026-09-20. It is preserved in the archive; the latest stories are on the live feed.

HTTP 402 has been "reserved for future use" since 1997. The future turned out to be AI agents that hold a wallet, and the spec that woke it up is x402 : a payment challenge carried in the response body, settled in stablecoin, with no account, no API key and no signup on either side. I shipped it on…

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  1. 2026-09-20 20:25 · DEV Community — AI
    HTTP 402 is not reserved for future use anymore: I put a 1-cent paywall on a live API for AI agents

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