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Mock API Service
A full-featured fake REST API for prototyping and testing. Features realistic data generation and chaos simulation.
- Posts & Users CRUD
- Chaos parameters
- Simulated file downloads
For Developers
Builder Resources
Professional-grade infrastructure tools to help you prototype faster and test edge cases without building your own sandbox.
Webhook Tester
Test your webhook integrations by receiving and logging real-time events.
- Live request log
- Custom response rules
- Header & Body capture
Email Sandbox
A "black hole" SMTP-like API to capture and inspect outbound emails without sending real mail.
- HTML Preview
- Attachment testing
- Spam score analysis
Payment Simulator
Test checkout flows and webhook callbacks without real money. Simulate success, fraud, or network timeouts.
- Intent Lifecycle
- Webhook Dispatch
- Chaos Headers
Built for Modern Workflows
Streamline your development process with tools designed for resilience and privacy.
Chaos Engineering
Inject delays and server errors via simple URL parameters to test your app's resilience.
Stateless & Fast
No accounts or database setup required. Just hit the endpoint and get your data instantly.
Privacy First
Full-privacy sandbox. We don't store your test payloads or monitor your private integrations.
Ready to Build?
Start prototyping with our free developer utilities today. No API keys required for basic testing.