Corsair
Open-source integration layer that connects your app's users to Gmail, Slack, Notion, etc.
Corsair is an open-source SDK (10k+ GitHub stars, 200+ integrations) that handles OAuth, webhooks, and rate limits for third-party apps like Gmail, Slack, Notion, and Stripe, so agent or product builders don't maintain that plumbing themselves. It adds per-integration permission modes where destructive actions require explicit user approval before running, and you can self-host the full SDK for free with no per-seat pricing or data leaving your stack. Pricing runs $0/mo (Hobby, 50 connections) to $200/mo (Pro, unlimited tool calls, 3 team members) to custom Enterprise; on the hosted Hub, credentials route through Corsair but aren't stored, so a database breach exposes none of your users' data.
What holds up
- +Open source with 10k+ stars — a missing integration means a PR, not a support ticket
- +Self-host the full SDK free — no per-seat pricing, no data leaving your infrastructure
- +Destructive actions require explicit user approval before they execute, by default
- +Hosted Hub never stores your credentials — a breach on their end exposes nothing of yours
Mind the limits
- −Pro tier jumps to $200/mo once you need more than 3 team members or 50 connections
- −Hosted Hub still relays your integration traffic through Corsair's own servers
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