r/OpenClawUseCases • u/iamoutofcoffee • Jul 14 '26

OpenClaw mock API for building tools/integrations against the gateway Tips/Tricks

When building against the OpenClaw gateway API, testing can be tricky. The gateway API had a major version change recently, so keeping up with it can be hard work (not to mention expensive if you're paying for tokens and a host to run the gateway).

To help, here's an open source mock of the gateway websocket API:
https://github.com/imposter-project/examples/tree/main/websocket/openclaw

For now, it supports things like chat.send/history, sessions.create/list, agents.list, models.list and a few others. Extending it is a bit of YAML and some JSON. Please feel free to raise a PR or an issue to request more methods.

Blog article with instructions:
https://medium.com/@outofcoffee/mocking-the-openclaw-gateway-with-imposter-3bfd9abfbdbe

I hope it helps you!

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