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Agents tracked: 444 Releases (7d): 644 Agent status: 3 with issuesSince last limit reset: Claude 31d · Codex 3d Updated Oct 23, 2026
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API docs and testing · by FetchSandbox

FetchSandbox

A testing service, driven from a coding agent through MCP or a CLI, that runs your third-party API integration (payments, webhooks and similar) against simulated provider 'twins', injects failures such as retries, duplicate or late requests, proposes fixes and returns a receipt of what was checked.

It targets the integration bugs normal CI misses, like a webhook delivered twice or a provider timing out, without pointing tests at a live provider account.

APIFree tierCommercial OK

Open fetchsandbox.com ↗ agent.md

For your project

Official API
Official API · Free tier Free: 500 runs and 5 fixes a month per developer; Pro: 10,000 runs and 100 fixes a month
“Free integration engine: connect through MCP and test supported integration workflows using controlled provider sandboxes.” fetchsandbox.com/llms.txt
Key
Needed
“Local tools can load without a key, but verification calls require authentication.” fetchsandbox.com/mcp
Formats
JSON
Data download
Not stated
Price
Free tier · from $200/mo $0 per developer: 500 runs and 5 fixes a month, full catalog, MCP and CLI
“Pro $200 per workspace, per month 10,000 runs, 100 fixes a month $3 a fix after; $5 per 10,000 runs after” fetchsandbox.com/pricing
License
FetchSandbox Terms Use of the testing service; your code and returned diffs/findings are yours; no reselling access, no live production credentials in sandboxes
Commercial use
Commercial use OK
“Your code stays yours. You give us permission to process it only so far as we need to run the job you asked for — reading a repository, reporting findings, producing a diff. We do not train models on it.” fetchsandbox.com/terms
Credit
Not stated
Embedding
Embedding unclear
Using the website
Free tier

Read on FetchSandbox's own pages on Oct 24, 2026 · license or terms · API docs · pricing. Check the license page before you ship.

For your agent

  • Add the local MCP server (npm fetchsandbox-mcp, MIT client, run with npx) and set FETCHSANDBOX_API_KEY to the raw key (no 'Bearer' prefix); hosted clients use https://fetchsandbox.com/mcp/v1 with Bearer/API-key auth (choosing 'None' returns 401). Hosted tools cannot read your local files, so use the local server for code checks.
  • Use test keys only; never upload live production credentials into a sandbox
  • Treat a receipt as evidence for the recorded version and scenarios only, not general production approval
  • Keep live billing disabled while testing against twins

llms.txt: fetchsandbox.com/llms.txt · MCP: Hosted https://fetchsandbox.com/mcp/v1 (Bearer/API key); local npm fetchsandbox-mcp via npx

Paste into your agent: Read https://agentgid.com/resources/fetchsandbox/agent.md before using FetchSandbox.

Quick answers

Does FetchSandbox have an API?

Yes. FetchSandbox has an official API documented at https://fetchsandbox.com/mcp.

Does the FetchSandbox API need a key?

Yes, you need an API key. Limits: Free: 500 runs and 5 fixes a month per developer; Pro: 10,000 runs and 100 fixes a month

Is FetchSandbox free?

Yes, there is a free tier: $0 per developer: 500 runs and 5 fixes a month, full catalog, MCP and CLI Paid plans start at $200 a month.

Can I use FetchSandbox in a commercial project?

Yes. Its terms say: "Your code stays yours. You give us permission to process it only so far as we need to run the job you asked for — reading a repository, reporting findings, producing a diff. We do not train models on it."

What you can build

  • A pre-merge check that replays a payment webhook twice and late to confirm the handler is idempotent
  • A CI gate that fails a PR when the FetchSandbox receipt shows an unverified invariant
  • An agent workflow that tests a new provider integration against a twin before any real keys are used

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