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DDG WebAuthn/Passkey Verification
x402
DDG WebAuthn/Passkey Verification is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-20).
Validates WebAuthn registration attestations and login assertions server-side using pure-Python CBOR/COSE parsing, checking Ed25519/ES256 signatures, UP/UV flags, signCount, and returning per-check verdicts.
Price / call$0.005
Success—
StatusUnknown
How this service works
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.
Output
Returns a JSON object with an 'ok' boolean and per-check verdict details including signature validity (Ed25519/ES256), UP (user presence) and UV (user verification) flag status, signCount value, and the echoed credential public key — allowing the caller to audit exactly which checks passed or failed.
Example use cases
Passkey login assertion validation
“A user just logged in with their passkey — can you verify the assertion? authenticatorData is '<base64>', clientDataJSON is '<base64>', signature is '<base64>', the original challenge was 'ch_xyz789', origin is 'https://myapp.com', and rpId is 'myapp.com'. Tell me if each check passes and what the signCount came back as.”
New passkey registration attestation check
“A new user registered a passkey on my site and I need to verify the attestation before saving it. The attestationObject is '<base64>', clientDataJSON is '<base64>', the challenge I issued was 'reg_chall_001', origin is 'https://accounts.example.com', and rpId is 'example.com'. Does the signature verify and what credential public key should I store?”
Detecting replayed or tampered passkey responses
“Can you run a WebAuthn assertion verification and specifically report the signCount and UP/UV flags? authenticatorData '<base64>', clientDataJSON '<base64>', signature '<base64>', challenge 'nonce_555', origin 'https://secure.mybank.com', rpId 'mybank.com' — I want to know if anything looks like a replay attack.”
Technical details
Endpoint
POSThttps://agents.daedalusdevelopmentgroup.com/v1/auth/webauthn-verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need stateless, server-side WebAuthn attestation or assertion verification without running your own Python environment or CBOR/COSE library stack. Ideal for AI agents or serverless workflows that need to verify passkey credentials on demand without managing cryptographic dependencies, and want granular per-check verdicts (signature, UP, UV, signCount) rather than a single pass/fail result.
Side effects
- Invalid or malformed base64 CBOR in attestationObject/authenticatorData returns a parse error
- Challenge mismatch between supplied challenge and clientDataJSON causes verification failure
- Origin or rpId mismatch results in a failed verdict
- Unsupported COSE algorithm returns an unsupported algorithm error
- Bad or corrupted signature bytes cause signature check failure
- Missing required fields (type, method, bodyType, body) return a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Tags
x402
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