Agentic Wallet (x401 & x402)

A protocol paper for credential-gated agentic access on Zetrix: proof-of-authority (x401) with composable payment (x402).

Autonomous agents now transact on behalf of humans and organizations. Two questions must be answerable at the HTTP boundary, per request, without a human in the loop: can you pay? (x402) and who authorized this, and are they allowed? (x401). This paper specifies how the Zetrix Agentic Wallet implements x401 as a native capability, reusing the same wallet service that already speaks x402.

How this documentation is organized

The paper is split into standalone topics so each section can be read, linked, and reviewed on its own:

• Protocol, Motivation, Background, and an x401 vs. x402 comparison.

• Architecture, roles, key terms, component design, and the crypto split.

• Flows, the protocol flow (messages, endpoints, POC payment) and the message flows (issuance, paid access, zero-knowledge proof).

• Delivery, the implementation approach, security considerations, and open items.

• Reference, the appendix: endpoints, glossary, and source material.