Pricing

0.048 USDC per verification — one claim checked against one source. Same price for people and agents.

Charged

A verdict was produced from a retrieved source: supported, contradicted, partially supported, ambiguous, not found in source, or unable to verify.

Not charged

Source unavailable (blocked, missing, JavaScript-only, unsupported format), invalid requests, model/provider failures, and retries with the same Idempotency-Key.

How to pay

x402: USDC on Base. Agents sign an EIP-3009 authorization; people use a browser wallet such as MetaMask. No account.

One price per verification, quoted before any work and bound into the x402 payment requirement. You are charged only when the source was retrieved and a verdict was produced: SOURCE_UNAVAILABLE and model/provider failures are not charged (the payment authorization is not settled). Requests rejected by validation are never charged. Retrying with the same Idempotency-Key never charges twice.

The price is set at roughly three times the measured variable cost of a verification (model inference, payment settlement, hosting, database). Machine-readable: /api/v1/pricing.