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Open protocol · x401

Enable your users to sign and authorize even when they arrive through AI

x401 tells an AI agent what identity and mandate are required to submit a request to your endpoint.

1 Your endpoint answers 401 with a PROOF-REQUEST 2 The person approves in their wallet 3 The agent retries with a verifiable credential
Read the spec ↗ Accept agents with x401 →

Signatures

Send a document for eSign Notarize a document Close a real estate transaction

Identity

Verify a person’s identity Request a verifiable credential Use OpenID Connect responses

AI tools NEW

Accept agents with x401 Let agents pay with x402 Delegate authority to an agent

Try it out

Create a transaction POST Add a document POST Retrieve a transaction GET Create a webhook POST Request a credential POST Get an access token POST
# Fairfax sandbox: test transactions, no charges $ curl https://api.fairfax.proof.com/v1/transactions/ot_d36j4ma \ -H "ApiKey: $PROOF_API_KEY" { "id": "ot_d36j4ma", "status": "sent", "detailed_status": "sent_to_signer", "documents": [{ "requirement": "notarization" }] }
Set up your Fairfax sandbox →