FetchSandbox is an API integration testing tool that plugs into AI coding assistants via MCP. It provides stateful sandboxes for 50+ pre-configured APIs (Stripe, GitHub, OpenAI, Twilio, etc.) to test webhooks, authentication, requests, and responses without consuming real API quota. It integrates with IDEs like Cursor, VS Code, Claude Code, and Windsurf, enabling developers to build and validate integrations quickly.
API integration testing that remembers what breaks
- Testing AI-generated API integrations before deployment
- Simulating webhook delivery, retries, and async event workflows
- Verifying integration contracts and state changes across multiple API calls
- Debugging failure scenarios and edge cases in a safe sandbox environment
- Accelerating development of third-party API integrations for SaaS products
- Add the FetchSandbox MCP configuration to your AI coding assistant (Cursor, VS Code, Claude Code, etc.)
- Select a pre-configured API sandbox (e.g., Stripe, GitHub) or create a custom integration
- Write your integration code using the sandbox endpoints to simulate API requests
- Trigger webhooks, retries, and failure events to test edge cases
- Validate workflow state and invariants before deploying to production
The open source Ahrefs alternative
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