Mock APIs, ready
before your backend is.
Define endpoints, shape responses, and simulate latency or failures in seconds. QuantaAPI removes the backend bottleneck so your frontend never waits.
No request sent yet.
Configure latency and status, then hit send.
Everything you need to simulate an API
QuantaAPI gives you the controls to reproduce real backend behavior — without waiting for one.
Response configuration
Define status codes, headers, and JSON bodies for every endpoint. Shape exactly what your client receives.
Latency control
Simulate real network conditions with response delays from milliseconds to several seconds.
Request validation
Validate incoming request bodies and headers against a schema so your mocked contract stays honest.
Error simulation
Inject configurable failure rates—500s, timeouts, and edge cases—to harden your error handling.
From zero to a working mock in three steps
No config files, no infra. Define, configure, and connect.
Define an endpoint
Pick a path and method — GET, POST, PUT, DELETE. No server to provision.
POST /api/checkoutShape the behavior
Set the response body, latency, and failure rate to match the scenario you need.
{ status: 200, latency: 800ms }Point your frontend at it
Call the fetch route with your collection key in the header — no session or SDK required.
x-collection-api-key: <token>Call your mock like a real API
No SDK, no session. Point your client at the fetch route with your collection key and start sending requests.
https://quanta-api-backend.vercel.app/endpoints/fetch/<path>x-collection-api-key{ "body": {...}, "header": {...} }curl -X POST https://quanta-api-backend.vercel.app/endpoints/fetch/akun \
-H "Content-Type: application/json" \
-H "x-collection-api-key: YOUR_COLLECTION_KEY" \
-d '{"body":{"username":"ammar"},"header":{}}'What you get back
X-Response-LatencySimulated latency in milliseconds.
X-Request-MethodHTTP method that matched the endpoint.
X-Validation-ErrorsJSON array of validation errors (only on failure).
Handle real-world failures
With error simulation enabled, the same request can return a502,504, or429at random. Build your retries, fallbacks, and error states against them — exactly like production.
Validate payloads too: declare the body and headers your endpoint expects, and mismatched requests come back as400with details in theX-Validation-Errorsheader.
Rich endpoint dashboard information
You can see the request logs in this dashboard
Stop waiting on the backend
Spin up your first mock endpoint in seconds. Free to start, no credit card required.