Factorial (n≤20). Call for combinatorics demos and small counting problems with ...
https://api.delx.ai/api/v1/x402/factorialOverview
Factorial (n≤20). Call for combinatorics demos and small counting problems with an explicit n cap. Returns n! for n up to 20; larger n returns a structured error. $0.001 USDC per successful call via x402 on Base—deterministic first-party JSON, no API key, no subscription, and nothing is billed on structured validation errors.
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