# route402

> Put a price in front of an API you already run. Agents discover it in a public x402 registry, pay per call, and get through — no API keys to issue, no signup, no invoice.

route402 has three surfaces: a directory of payable services, a publisher console, and a remote MCP server that lets an agent publish an API without a browser.

## Start here

- [Publish MCP server](https://route402.dev/mcp): Streamable HTTP MCP endpoint. OAuth 2.1 + PKCE, dynamic client registration. Paste this URL into an MCP client.
- [Protected resource metadata](https://route402.dev/.well-known/oauth-protected-resource): RFC 9728 document naming the authorization server for https://route402.dev/mcp.
- [Authorization server metadata](https://route402.dev/.well-known/oauth-authorization-server): RFC 8414 endpoints, including dynamic client registration at https://route402.dev/register.
- [Directory API](https://route402.dev/api/directory): Every listing as JSON, with prices, schemas and measured trust signals. Supports ?q=, ?type=, ?maxPrice=, ?settled=1.

## Documentation

- [Quickstart](https://route402.dev/docs/quickstart.md): Wrap an API, price it, and publish it to the registry in about five minutes.
- [How x402 works](https://route402.dev/docs/how-x402-works.md): The four-leg HTTP exchange that turns 402 Payment Required into a completed call.
- [Publish MCP server](https://route402.dev/docs/publish-mcp.md): The remote MCP server at /mcp — connection, OAuth, and the six publishing tools.
- [Upstream credentials](https://route402.dev/docs/credentials.md): How your API key is stored, injected, and why nothing can read it back.
- [Directory and trust signals](https://route402.dev/docs/directory-and-trust.md): What the directory reads, how listings are ranked, and which signals are measured rather than claimed.
- [Pricing and settlement](https://route402.dev/docs/pricing-and-settlement.md): How a dollar price becomes an on-chain amount, what settles when, and what is never charged for.

## Optional

- [Full documentation as one file](https://route402.dev/llms-full.txt): Every page above, concatenated.
- [Human directory](https://route402.dev/directory): The same listings, rendered for people.