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x402 and the propose-confirm pattern: how AI agents pay for API calls without a credit card

This story is from 2026-08-26. It is preserved in the archive; the latest stories are on the live feed.

The HTTP 402 status code has been in the spec since 1992. Until now, no one built a standard way to actually use it for payments. x402 is CAI Labs' implementation of HTTP 402 Payment Required for AI agents. It turns a status code into a checkout flow where the agent proposes the spend and a separat…

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  1. 2026-08-26 06:34 · DEV Community — AI
    x402 and the propose-confirm pattern: how AI agents pay for API calls without a credit card

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