FetchSandbox
Runnable API integrations for developers and AI agents
2 followers
Runnable API integrations for developers and AI agents
2 followers
Most API tests stop at 200 OK. FetchSandbox lets developers and AI agents verify what happens next: webhooks, retries, state transitions, async workflows, and failure scenarios. Connect through MCP to Cursor, Claude Code, Windsurf, VS Code, and Codex. Explore 50+ APIs including Stripe, GitHub, Clerk, Resend, Twilio, and OpenAI in seconds—without burning real API quota or waiting on staging environments.
Hey PH 👋 Raj here, founder of FetchSandbox.
15+ years building APIs and developer platforms at Meta, PayPal, Pinterest, and IBM. Same pattern at every company:
→ The request succeeds.
→ The test passes.
→ The integration still breaks in production.
At PayPal I watched a colleague lose three days to a webhook that fired correctly in tests but silently dropped a metadata field in prod. Customer support traced the chargebacks back to him. No test caught it because every mock we had echoed the request body back instead of what the provider actually stored.
FetchSandbox is what I wish I'd had that week.
→ Runnable sandboxes for 60+ APIs (Stripe, GitHub, Twilio, Resend, Clerk, AgentMail, Surge, more)
→ Real state transitions, real webhook lifecycles, real failure modes
→ Plugs into Cursor, Claude Code, Windsurf, VS Code, Codex via MCP — 30 seconds to install
Every workflow run produces a public receipt URL anyone can replay. No auth, no signup. PRs link to a receipt URL instead of "trust me, it works."
Example receipt → fetchsandbox.com/runs/ebe5482c34
Question for the room: what's the dumbest integration bug that made it to your production because your test env lied to you? I've been collecting these for a decade.
Huge thanks to @[hunter] for hunting us 🙏