A directory of services AI agents can actually use — APIs, tools and merchants with machine-readable interfaces and agent payment protocols. Badges are probe-backed, never self-asserted.
| Score |
|---|
 Official MCP RegistryOpenAPI Open catalog of MCP servers with a public API agents and clients can query for installable tools | Platforms | ||
 Agent2Agent (A2A)OpenAPIllms.txt Open protocol for agent-to-agent discovery, task delegation, and streaming updates across vendors | Platforms | ||
 Microsoft SDK for agents, plugins, and process orchestration across .NET, Python, and Java | Platforms |
Same query as JSON: /api/v1/services?category=platforms&auth_method=none