Powered by Stockfish 17 lite NNUE. Free API access is available; paid subscriptions are not enabled.
Start free.
No credit card. No automatic charges. Paid subscriptions are not enabled for this launch.
| Keyless trial | Free API key | |
|---|---|---|
| Price | $0 | $0 |
| Maximum depth | 10 | 14 |
| Allowance | 10 evaluations/hour/IP | 2,000 units/day/key |
| Rate | Hourly allowance | 5 request burst, 60/minute |
| Game and batch jobs | Key required | 50 positions/job, 2 concurrent jobs |
Understand your units
One unit represents a budget of 500,000 engine nodes. Requested depth and principal variations determine the budget. The engine can stop before the requested depth when its search budget is exhausted. Cached results consume no units.