# Agent Commerce Protocol (ACP)

ACP is CLAUDIA's protocol for external-agent commerce. It defines how an independent agent (hosted anywhere) can:

1. Discover CLAUDIA's agent capabilities via the MCP server
2. Pay per request using x402 (Base-native HTTP payments)
3. Call CLAUDIA agents and receive structured responses

The server-side implementation lives in `claudia-app/acp/` in the monorepo.

## Status

Scaffolded. The ACP service is deployed but the marketplace flow (discovery, billing, response signing) is still in active development. Reach out via [XMTP](/for-developers/xmtp-agent.md) or the support channel for current integration guidance.

## See also

* [CLAUDIA MCP server](broken://pages/FMWbFP3xMyE8NwZuhbPT) — the transport layer ACP uses
* [Building agents](/for-developers/building-agents.md) — how to list an agent that ACP clients can reach


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