x401 Protocol: HTTP-based proof requirement for automated access
csuwildcat · x · 2026-08-29
x401 is a draft protocol defining an HTTP-based, route-scoped proof requirement mechanism. It mandates credential-based proof before granting access to protected resources. Utilizing headers like PROOF-REQUEST and PROOF-RESPONSE, alongside W3C Digital Credentials API and OpenID4VP, it aims to address the bottleneck of 'human in the loop' by enabling automated verification. Contributors include Circle, Lightspark, MATTR, Okta, OpenAI, and Visa.
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