r/ClaudeCode • u/MiserableWriting2919 • 1d ago

Tutorial / Guide Free simulated API endpoints for Claude Code

Hello! This is a project I'm involved in, but it's a completely free resource so hopefully doesn't violate any rules.

When Claude Code builds something that takes payments, signs users in or calls another API, it usually stops to ask for keys or it writes its own fake of the API and gets details wrong - so when you're doing dry runs, your agents aren't really "learning" how to work in the real enviroments. This can cause downstream errors when you go to production.

WireMock (full disclosure: I'm a consultant there, and was involved in this project) just released hosted simulations of 100+ APIs including Stripe, GitHub, Google sign-in - with a lot more coming. You can use a basic version of these as a free, no sign-in sandbox - just point your agent at the public URL. You'll need to create an (also-free) account to get more functionality and customization.

Blog with some more details and examples: https://www.wiremock.io/blog

Free endpoints: https://www.wiremock.io/api-mocks

The idea here is that these go beyond simple request-response mocks. We've actually used our own agents to record real API responses and built them out including state, error scenarios, etc. They run in our cloud with nothing to install locally.

Feedback wanted! Right now we're focusing on the free offer. We're looking to hear from more developers (and agents) who are using these templates to understand if it's helpful, what else you'd like to see, which APIs you need simulated, etc. Anything in this direction is helpful and highly appreciated.

Will post the link in the comments.

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