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June 27, 2026Proof has launched x401, an open protocol that enables websites or APIs to verify the identity behind agents. This protocol allows agents to present credentials and authorization, which services can verify before proceeding.
The x401 protocol allows services to specify the type of proof required, including verified identity, age, membership, organizational affiliation, signing authority, and proof of humanness. Each service can choose which types of proof are necessary and verify the issuer, claim, scope, and action before making a decision.
By establishing an open protocol for AI agent identity and authorization, x401 aims to provide a standardized way for services to validate the identity behind AI agents, helping to ensure trust and security in online interactions.





