Sits between your agents and real APIs like Stripe, HubSpot and Slack, claiming a dedup slot in Redis before forwarding a request so a retry returns the cached result instead of firing twice. Ships as a self-hosted Docker Compose service (free forever) or a cloud version, with plugins for n8n, Make, Zapier and native MCP. The landing page is upfront that if you already call Stripe directly, its native Idempotency-Key header is enough on its own — the pitch here is for providers without native idempotency, no-code tools that can't set headers, and one audit trail across multiple services.
What holds up
- +Self-hosted version is unlimited and free forever — no per-seat SaaS fees
- +Concurrency dedup is proven in a public test (dedup.test.js) you can clone and run yourself
- +Works with no-code tools like n8n, Make and Zapier that can't set idempotency headers themselves
Mind the limits
- −Landing page says if you already call Stripe directly, its native Idempotency-Key is enough — skip this
- −Needs Redis and a proxy hop in front of every API call, one more piece of infra to run
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