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API Playground

Pick any API, paste your X-API-Key, tweak the body and fire a real request — everything happens in your browser.

All APIs
Smart Homework Grading →

Upload a single K12 homework or test paper image for smart recognition, returning per-question grading conclusions, error analysis, and overall statistics to assist teachers and parents with homework checking.

Try it out

Paste your X-API-Key, tweak the body, and fire a real request. Great for integration & regression checks.

POSThttps://openapi.toolkk.com/v1/homework-grading

Without an API key the request will go out anonymously and may be rejected by the gateway.

// Response will appear here after you send the request