Generic Registry API Specification

A standardized RESTful HTTP API for MCP registries to provide consistent endpoints for discovering and retrieving MCP servers.

Also see:

For guidance consuming the API, see the consuming guide.

Browse the Complete API Specification

📋 View the full API specification interactively: Open openapi.yaml in an OpenAPI viewer like Stoplight Elements.

The official registry has some more endpoints and restrictions on top of this. See the official registry API spec for details.

Quick Reference

Core Endpoints

GET /v0/servers - List all servers with pagination
GET /v0/servers/{serverName} - Get latest version of server by server name (URL-encoded)
GET /v0/servers/{serverName}/versions/{version} - Get specific version of server (both parameters should be URL-encoded)
GET /v0/servers/{serverName}/versions - List all versions of a server
POST /v0/publish - Publish new server (optional, registry-specific authentication)

Authentication

Read operations: No authentication required
Write operations: Registry-specific authentication (if supported)

Content Type

All requests and responses use application/json

Pagination

List endpoints use cursor-based pagination for efficient, stable results.

Usage

Initial request: Omit the cursor parameter
Subsequent requests: Use the nextCursor value from the previous response
End of results: When nextCursor is null or empty, there are no more results

Important: Always treat cursors as opaque strings. Never manually construct or modify cursor values.

Basic Example: List Servers

curl https://registry.example.com/v0/servers?limit=10

{
  "servers": [
    {
      "server": {
        "name": "io.modelcontextprotocol/filesystem",
        "description": "Filesystem operations server",
        "version": "1.0.2"
      },
      "_meta": {
        "io.modelcontextprotocol.registry/official": {
          "status": "active",
          "publishedAt": "2025-01-01T10:30:00Z",
          "isLatest": true
        }
      }
    }
  ],
  "metadata": {
    "count": 10,
    "nextCursor": "com.example/my-server:1.0.0"
  }
}

For complete endpoint documentation, view the OpenAPI specification in a schema viewer.

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