API and MCP

Use your entries from your own tools with the REST API and the MCP server (Pro).

Pro users can read and write their entries from other tools. These pages cover getting an API key, every API endpoint and connecting Claude Code with the MCP server.

API: getting started

Connect your own code to Ultrathink with a device key: access, limits, errors and paging

API reference

Every Ultrathink API endpoint, with its parameters, fields and replies

MCP server

Connect Claude Code and other AI tools to your Ultrathink entries