Launched at MCP Night 4 — AI Engineer World's Fair 2026

The auth.md Protocol Hub

The open protocol that lets AI agents register for your service. No sign-up forms. No OAuth dance.

Install the Skill Read the Spec

What is auth.md?

Learn how the protocol enables AI agents to register for services autonomously.

Three Registration Flows

Identity Assertion, Service Auth, and Anonymous flows for different security models.

auth.md vs llms.txt

Three files, three jobs. See which agent convention file you need.

Install the Skill

Add auth.md support to your AI agent in one command.

How it works

auth.md discovery flow: Agent calls API, gets 401, fetches metadata, registers, and uses credential

Why auth.md?

•Standards-based — Built on RFC 9728 (OAuth Discovery Metadata)
•Zero-friction — Agents register without human intervention
•Discoverable by default — A single well-known file makes your service agent-ready
•Part of the stack — Pairs with llms.txt, agents.md, and x402 for full agent autonomy

auth.md + x402 = the endgame. auth.md handles identity and credentials. x402 handles payments. Together, they let agents discover, authenticate, and pay for services — all without human intervention. The full autonomous agent stack.