Payment
Priced per call in USDC over x402. Verification stays free and keyless.
There are no API keys. A priced endpoint answers 402 Payment Required with the amount, currency and network; the caller settles and retries with proof. See Paying with x402 for the walkthrough, and the pricing page for what each tier costs.
| Header | Direction | Meaning |
|---|---|---|
X-Payment-Amount | Response | Price for this call, decimal. |
X-Payment-Currency | Response | Always USDC today. |
X-Payment-Network | Response | Settlement network for this quote. |
X-Payment-Recipient | Response | Address to settle to. |
X-Payment-Proof | Request | Settlement proof, sent on the retry. |