FetchSandbox
End-to-end verification sandbox for AI agent API integrations
About FetchSandbox
FetchSandbox builds and verifies API integrations for AI agents, offering pre-configured APIs and support for development environments such as Cursor, Claude, Codex CLI, VS Code, and Windsurf. It can simulate webhooks, retries, failed requests, and asynchronous events, verifying webhook delivery, workflow state, contracts, and end-to-end behavior without touching real API quotas. Each workflow run also checks final states, required webhook events, and invariants against the success spec, and provides receipt URLs that can be pasted into PRs and Slack.
Best for
Best use cases
Developing API integrations
Testing webhooks and authentication flows
Verifying asynchronous workflows and failure retries
Reproducing integration bugs and sharing test results
Features
Pre-configured APIs
Provides ready-to-use API integrations to help you start testing quickly.
Realistic behavior simulation
Simulates webhooks, retries, failed requests, and asynchronous events without a mock server or complex setup.
Workflow verification
Checks final states, required webhook events, invariants, and contracts end to end against the success spec.
Result receipts
Generates receipt URLs that can be pasted into PRs and Slack, making test results easy to share.
Pros
- Pre-configured APIs ready to use out of the box
- Can simulate webhooks, retries, failed requests, and asynchronous events
- Verifies workflow state, contracts, and end-to-end behavior
- Consumes no real API quotas and provides shareable receipt URLs