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What Is x401? Proof's Agent Identity Protocol, Checked Against a Live x402 Endpoint

This story is from 2026-10-16. It is preserved in the archive; the latest stories are on the live feed.

What Is x401? Proof's Agent Identity Protocol, Checked Against a Live x402 Endpoint x401 is Proof's open, HTTP-based proof-requirement protocol: a server answers with a 401 plus a PROOF-REQUEST header naming the credential an agent must present — personhood, residency, accreditation, membership, or…

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  1. 2026-10-16 13:25 · DEV Community — AI
    What Is x401? Proof's Agent Identity Protocol, Checked Against a Live x402 Endpoint

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