FetchSandbox

API integration testing that remembers what breaks

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Most API tests stop at a simple 200 OK response. FetchSandbox goes further, letting developers and AI agents verify the full sequence: webhooks, retries, state changes, async workflows, and failure scenarios. It reproduces the exact bug, proves the fix, and keeps a memory of what breaks, so your agent can catch issues before they reach production. Connect through MCP to popular tools like Cursor, Claude Code, Windsurf, VS Code, and Codex. You can explore over 60 APIs including Stripe, GitHub, Clerk, Resend, Twilio, Descope, and OpenAI, without consuming real API quota or waiting for a staging environment.