Topview Motion StudioGet a launch video for about $3, not thousands
Promoted
Most API tests stop at 200 OK. FetchSandbox lets developers and AI agents verify what happens next—webhooks, retries, state changes, async workflows, and failure scenarios. It reproduces the real bug, proves the fix, and remembers what breaks—so your agent catches it before production. Connect via MCP to Cursor, Claude Code, Windsurf, VS Code, and Codex. Explore 60+ APIs—Stripe, GitHub, Clerk, Resend, Twilio, Descope, OpenAI—without burning real API quota or waiting on staging.
FetchSandbox
thanks man, and you framed the core exactly, most tools stop at the 200 and hide the async stuff. the Postman/MSW comparison is right too, custom mocks rot fast across dozens of apis.
your improvement points are fair, and let me be straight on one of them:
1/the "automated repair loop where an agent applies a fix", i have to correct this one, its not actually shipped. today fetchsandbox reproduces the failure and proves whether a fix holds, but it does not apply the fix for you. the agent-fixes-then-reproves loop is the next thing im building, not live. didnt want you crediting something thats still roadmap.
2/streamlined custom openapi import for private internal microservices, agreed. you can import a spec today, but making that path smooth (and getting the deep failure library to work on your own endpoints, not just the seeded set) is real work ahead.
3/clearer state-transition visualization during deep nested retry cycles, fair. the trace is there but the observability for nested retries could be a lot better. on the list.
4/offline / self-hosted container execution for strict-data teams, noted, and its come up before. the engine runs server-side today, an offline mode for security-sensitive teams is a real enterprise ask im tracking.
appreciate the depth, finding the actual edges is worth more to me than the rating.