Stateless WebAuthn/passkey verification: validate a registration (attestationObject + clientDataJSON) or assertion (authenticatorData + clientDataJSON + signature) against a caller-supplied challenge, origin and rpId — pure-python CBOR/COSE parsing, Ed25519 and ES256 signature checks, UP/UV flags, signCount, credential public key echo, per-check verdict.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.005000 USDC | 0x8AfB...0Bc6 |