OpenAPI.city

Welcome toopenapi.city— structured OpenAPI specifications for AI agents and developers. Search, browse, and query thousands of public API specs via REST API or MCP.

Sign up for openapi.city. Read https://openapi.city/signup.md for instructions.

- Ask for your email
- Create your account and get an API key
- Configure MCP integration automatically
- You confirm via email to activate

1. Sign upatopenapi.city/dashboardand create an account.

2. Generate an API keyfrom theAPI Keyspage.

curl -H "Authorization: Bearer oac_live_YOUR_KEY_HERE" \ https://openapi.city/api/v1/providers/search?q=stripe

{ "results": [ { "slug": "stripe", "name": "Stripe", "description": "Online payment processing for internet businesses", "category": "payments", "endpoint_count": 243 } ], "endpoint_matches": [], "meta": { "page": 1, "per_page": 25, "total": 1, "total_pages": 1 } }

Feature Endpoint Description Search APIsGET /api/v1/providers/search?q=Full-text search across all providers List providersGET /api/v1/providersPaginated index of all API providers Provider detailsGET /api/v1/providers/:slugMetadata, version info Full specGET /api/v1/providers/:slug/specComplete OpenAPI specification EndpointsGET /api/v1/providers/:slug/endpointsAll endpoints for a provider Single endpointGET /api/v1/providers/:slug/endpoints/:method/*pathDetailed endpoint info SchemasGET /api/v1/providers/:slug/schemas/:nameSchema definitions SummaryGET /api/v1/providers/:slug/summaryGenerated spec summary Auth requirementsGET /api/v1/providers/:slug/authAuthentication schemes Resolve URLPOST /api/v1/resolveIngest a new spec by URL

- REST API— standard HTTP requests, ideal for scripts, backends, and tools
- MCP Server— native integration with AI coding assistants (Cursor, Claude Code, Windsurf)

This is a web browser that enables your coding agent, such as Claude Code, to visit websites on your behalf and assist you in identifying bugs or creating UI test cases.

A server that dynamically creates MCP endpoints from any OpenAPI specification URL.

Turn any OpenAPI 3.0 spec into an MCP server with zero code — deploy to Cloudflare Workers, Node.js, Docker, or run locally via npx, with a built-in OAuth 2.1 server for MCP clients that require custom connector authentication.

An MCP server for any web application with an OpenAPI specification, connecting AI models to external tools and data services.

A zero-configuration tool to automatically expose FastAPI endpoints as MCP tools.

An MCP server that enables Large Language Models to make HTTP requests and interact with web APIs. It supports automatic tool generation from OpenAPI/Swagger specifications.

CLI tool that generates MCP servers from OpenAPI/Postman specs — pip install mcpgen-cli

A secure MCP-to-OpenAPI proxy server that converts MCP tools into OpenAPI compatible HTTP servers, with support for multiple server types and automatic API documentation.

Turn any OpenAPI/Swagger spec into Claude tools. Zero config, zero code.

Connect to any OpenAPI-based API with built-in OAuth2 authentication management.

Converts OpenAPI/Swagger specifications to Model Context Protocol (MCP) format, providing a modern Web UI and a backend service.