Corsair

Corsair is an open source integration layer that lets AI products connect to the apps their users rely on without building and maintaining each integration in house. It handles OAuth, token refresh, webhook verification, rate limits, API changes and credential isolation per tenant, so an AI agent can read from and act in tools such as Gmail, Slack, Notion, HubSpot, Google Calendar, Stripe, Airtable, Linear, GitHub and Discord. It is aimed at teams building agents and AI applications that need secure, multi tenant integrations. Permissions are set per integration, and destructive actions require explicit approval through a review link before they run. Corsair exposes integrations over MCP and webhooks, stores data kept fresh by webhooks and polling in per tenant partitions so repeated reads do not hit third party APIs, and can run hosted or self hosted. The SDK is written in TypeScript, and developers can add any missing integration themselves by scaffolding a plugin or opening a pull request. When using the hosted Corsair Hub, the company states it acts as a relay and does not keep user credentials. The full SDK can be self hosted for free. Hosted pricing is published: Hobby costs $0 per month with unlimited tool calls, 50 connections, 100k webhook events, up to three team members and Corsair branding on consent screens. Pro costs $200 per month and makes connections, webhooks and team members unlimited, adds custom branding, Slack support and custom integrations built by the Corsair team. Enterprise pricing is custom. Corsair is backed by Y Combinator.