Raj Nagulapalle

Raj Nagulapalle

FetchSandboxFetchSandbox
Runnable API integrations for agents

About

Founder of FetchSandbox. Ex Meta, PayPal, Pinterest, and IBM. After spending 15+ years building APIs and developer platforms at Meta, PayPal, Pinterest, and IBM, I kept seeing the same problem: integration tests stop at 200 OK, but production failures happen in webhooks, retries, state transitions, and async workflows. I'm building FetchSandbox to help developers and AI agents verify real integration behavior before shipping. Today it powers runnable environments for APIs like Stripe, Clerk, Resend, Twilio, and more through MCP, CLI, and the web. Always happy to chat with founders, developer tooling teams, API companies, and engineers building for the agent era.

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Maker History

  • FetchSandbox
    FetchSandboxAPI integration testing that remembers what breaks
    Jul 2026
  • 🎉
    Joined Product HuntApril 27th, 2026

Forums

5d ago

How do you use your time more effectively when you are a busy entrepreneur?

The more projects and responsibilities you have, the more you try to organise your time better and accomplish as much as possible in the shortest amount of time.

Not to mention when you have a family and want to make time for your personal life too.

What FetchSandbox does and doesn't do — in plain words

Hey all ahead of our Aug 2 relaunch, I'd rather be useful than hypey. Here's the honest map: what we test, what we don't (yet), what languages it works with, and where we're going.

The failures we test for (the "it passed, then broke in prod" stuff):

  • Double-processing the same webhook arrives twice; do you charge the customer twice?

  • Out-of-order / late events a "canceled" and a stale "active" land in the wrong order; does a canceled account come back to life? (live for Paddle today)

  • Sad paths card declined, payment failed, thing-not-found; does your code handle it, or quietly mark it "done"?

  • Rate limits the API throttles you (429); do you back off, or silently drop data?

  • Wrong-shape responses the API returns a field you didn't expect or renamed; does your code break downstream?

  • Auth slips bad/expired key, or a read-only key doing writes; caught or not?

  • Fake / replayed webhooks unsigned, tampered, or old signed events; rejected?

  • Slow + flaky delivery delays and dropped webhooks.

Every run hands you a receipt: the failure reproduced, then gone after the fix.

We built a debugging tool that refuses to guess

Most AI tools, when they're unsure, guess confidently.

That's how you burn an hour chasing the wrong bug.

We went the other way. Point ours at your repo and say what's breaking "customers are getting charged twice." Instead of guessing which API, it reads your code:

  • Sees you have both Stripe and Paddle installed.

  • Reads both webhook handlers your Paddle one has no idempotency check (line 16); Stripe dedupes fine.

  • Tells you: "it's your Paddle handler." A fact from your code, not a hunch.

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