Corsair

Corsair is an open source integration layer for AI agents, built natively on the Model Context Protocol (MCP) . It connects any API to any AI model through pre built connectors, a hosted Hub, and a typed TypeScript SDK you can self host for free. Corsair handles the parts of integration work that quietly become a maintenance burden: OAuth and token refresh, multi tenant credential isolation, webhook signature verification, API deprecations, and rate limit handling. None of your credentials or user data are stored on Corsair's side; the hosted Hub acts purely as a relay between your product and each integration. Built in permissions mean destructive actions require explicit approval before they execute, so your users get a review link instead of a surprise. Backed by Y Combinator and licensed Apache 2.0, Corsair is fully open source.