FetchSandbox
API integration testing that remembers what breaks
FetchSandbox launched on July 12, 2026 with 348 votes, #72 of 24,623 launches that month and more than 99% of that year's launches.
In plain words
FetchSandbox is an API integration testing platform that goes beyond basic status code verification to test webhooks, retries, state changes, and failure scenarios. It's designed for developers and AI agents who need to validate complex API behaviors without using real API quota or staging environments. The tool connects to code editors via MCP protocol and provides access to over 60 popular APIs including Stripe, GitHub, and OpenAI, allowing teams to reproduce bugs, verify fixes, and build institutional knowledge about what breaks.
written from the facts on this page · September 2026
From the sources
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.
Your agent's code passes. The workflow still breaks. FetchSandbox runs every service the workflow touches, makes them misbehave the way the real ones do, and checks the end state was right — then re-runs the identical scenario to prove the fix held. One MCP config into Cursor, Claude Code or Codex. No keys, no vendor accounts.
Run every service the workflow touches, make them fail the way the real ones do, and prove the fix held — without burning real API quota. Build and test API integrations without leaving your AI coding assistant. Your agent stops shipping integrations that “work” in tests but break in production. Every workflow run includes the spec of what success looks like — terminal state, required webhook events, invariants — verified end-to-end. Connect your tools, test real API workflows, and ship integrations with confidence. Add FetchSandbox to your IDE and start testing APIs in minutes. Works with Cursor, VS Code, Claude Code, Windsurf, and more. Simulate real API behavior like webhooks, retries,…from fetchsandbox.com
Pricing, as stated on its site
Free tier, paid plans from $5/mo — Free tier with 1,000 runs/month. Pro plan at $5/month with 10,000 runs/month plus pay-as-you-go overage ($5 per extra 10,000 runs). Enterprise with custom pricing.
checked September 2026 · prices change
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