OpenAPI MCP Server

What is OpenAPI MCP Server?

It is a Cloudflare Workers‑based service that dynamically creates an MCP server from any OpenAPI schema definition endpoint, enabling seamless integration with tools like Prompteus, Claude, and Cursor. It acts as a stateless proxy between MCP clients and OpenAPI‑documented APIs.

How to use OpenAPI MCP Server?

Install dependencies with npm install, then run locally with npm run dev. Configure the endpoint by encoding a JSON payload (containing schemaUrl and baseUrl) into base64url format and appending it to the server URL (e.g., http://localhost:8787/mcp/{base64Payload}). A hosted version is available at https://bridge.openapitomcp.com — replace the localhost URL accordingly. A web interface at https://openapitomcp.com can automatically generate the configuration payload.

Key features of OpenAPI MCP Server

• Dynamically creates an MCP server from any OpenAPI schema
• Stateless proxy – no data storage
• Free hosted service at bridge.openapitomcp.com
• Supports multiple AI tools and IDEs (Prompteus, Cursor, VS Code, Windsurf, Zed)
• Web interface for easy configuration generation

Use cases of OpenAPI MCP Server

• Integrate third‑party REST APIs into AI assistant workflows
• Automate API operations (e.g., list, add, update, delete resources) through MCP clients
• Provide a consistent MCP interface for any OpenAPI‑documented API without writing custom code

FAQ from OpenAPI MCP Server

What is the OpenAPI MCP Server?

It is a Cloudflare Workers service that dynamically generates an MCP server from any OpenAPI schema, allowing AI tools like Claude and Cursor to interact with that API through MCP.

How do I configure the server for a specific API?

Create a JSON object with schemaUrl (the OpenAPI schema endpoint) and baseUrl (the API’s base URL), encode it in base64url format, and append it to the server URL. The web interface at openapitomcp.com can generate this for you.

Is there a free hosted version?

Yes, a free best‑effort hosted version is available at https://bridge.openapitomcp.com. It is maintained by the Prompteus team and provided as‑is without uptime guarantees.

Which tools/IDEs support this server?

It can be used with Prompteus, Cursor, Visual Studio Code, Windsurf, and Zed. Each has specific configuration steps using npx mcp-remote with the server URL.

Are there any runtime dependencies?

For local use, you need Node.js to install dependencies and run the service. The hosted version requires no local setup – just provide the configured URL to your MCP client.