Congrats on x401! The HTTP-native challenge framing is right, and pairing it with x402 cleanly separates "who is this" from "can it pay." We are building in the adjacent space and would like to compose, not duplicate.
FLINT (flint.network) is a verification layer for AI agents that move money: it checks an agent's authority and integrity at transaction time, returns a four-state verdict (allow, step-up, review, block), and emits a signed record. We read x401 v0.2.0 as the credential-presentation envelope, and we sit above it: x401 establishes who authorized the agent; FLINT establishes whether that agent is still uncompromised, in scope, and safe to transact right now.
Two things we would value your view on:
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Verifier-side composition. We intend to act as an x401 verifier that consumes a principal-identity presentation as one input and adds the integrity/behavior/reputation verdict. Anything you would flag for verifiers feeding the result into a downstream policy decision rather than a simple allow/deny?
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The deferred agent-authentication question. Your Open Questions list "Adding Agent Authentication" as future work, and the spec is explicit that a presentation binds to the verifier, not the agent. That gap, proving the agent itself is the authorized, uncompromised one (not just that a credential was presented), is exactly what we work on. We would be glad to contribute there, whether as a verifier reference, as an issuer of an "agent authority" credential type that verifiers can name in their DCQL trusted_authorities, or to the FIDO agentic-authentication workgroup you mentioned.
Happy to share how we are wiring an x401 verifier into our verdict flow if useful. Either way, glad this exists.
VR, JT
contact@flint.network
Congrats on x401! The HTTP-native challenge framing is right, and pairing it with x402 cleanly separates "who is this" from "can it pay." We are building in the adjacent space and would like to compose, not duplicate.
FLINT (flint.network) is a verification layer for AI agents that move money: it checks an agent's authority and integrity at transaction time, returns a four-state verdict (allow, step-up, review, block), and emits a signed record. We read x401 v0.2.0 as the credential-presentation envelope, and we sit above it: x401 establishes who authorized the agent; FLINT establishes whether that agent is still uncompromised, in scope, and safe to transact right now.
Two things we would value your view on:
Verifier-side composition. We intend to act as an x401 verifier that consumes a principal-identity presentation as one input and adds the integrity/behavior/reputation verdict. Anything you would flag for verifiers feeding the result into a downstream policy decision rather than a simple allow/deny?
The deferred agent-authentication question. Your Open Questions list "Adding Agent Authentication" as future work, and the spec is explicit that a presentation binds to the verifier, not the agent. That gap, proving the agent itself is the authorized, uncompromised one (not just that a credential was presented), is exactly what we work on. We would be glad to contribute there, whether as a verifier reference, as an issuer of an "agent authority" credential type that verifiers can name in their DCQL trusted_authorities, or to the FIDO agentic-authentication workgroup you mentioned.
Happy to share how we are wiring an x401 verifier into our verdict flow if useful. Either way, glad this exists.
VR, JT
contact@flint.network