FetchSandbox
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API integration testing that remembers what breaks
WebsiteMCP ServerAPIWeb AppVS Code
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fetchsandbox.com/
What is FetchSandbox?
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
Core Features
Pre-configured sandboxes for 50+ APIs (Stripe, GitHub, OpenAI, Twilio, etc.)
MCP-based integration with AI coding assistants (Cursor, VS Code, Claude Code, Windsurf, Codex)
Test webhooks, auth, requests, responses, and error scenarios with realistic simulations
Stateful workflow testing: retains state across requests for complete integration validation
Rapid setup from idea to working integration in minutes without complex configuration
Popular Use Cases
- 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
Feature Comparison
A functional comparison based on maker input.
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Comparison details are provided for informational purposes and should be verified with the official website.
How to use
- 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
Pricing
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Free
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Pro
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Enterprise
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