# DDG WebAuthn Attestation Trust Check

> DDG WebAuthn Attestation Trust Check 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).

Parses and verifies a WebAuthn attestationObject, checks packed and FIDO-U2F self-attestation signatures, optionally verifies x5c leaf certificate signatures, and returns the trust level, AAGUID, and credential material.

## Facts

- Endpoint: POST https://agents.daedalusdevelopmentgroup.com/v1/auth/webauthn-attestation?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ddg-webauthn-attestation-trust-check-e04f3fa2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W5Gz76Sq55YYF1l9ZTN5f

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ddg-webauthn-attestation-trust-check-e04f3fa2 -d '<json body>'
```

Example prompt: Check the trust level of this WebAuthn registration by verifying the attestationObject — it uses packed attestation format — and tell me the AAGUID, whether the signature checks out, and what trust level you can confirm without FIDO MDS.

## When to prefer this

Use this endpoint when you need a stateless, pay-per-call cryptographic check of a WebAuthn attestationObject — specifically for packed or FIDO-U2F attestation formats — without standing up your own FIDO MDS-connected verifier. Prefer this over full passkey verification endpoints when you only need the attestation trust check and AAGUID extraction step in isolation.

## Known failure modes

- Invalid or malformed attestationObject causes parse failure and 400-class error
- Signature verification failure when attStmt signature does not match the credential public key
- x5c certificate verification unavailable if crypto backend is not present
- Unsupported attestation format (e.g. TPM or Android safetynet) not handled by this endpoint
- Missing required body fields returns validation error
- Payment not included or insufficient USDC causes x402 payment-required rejection

## How this service works

WebAuthn attestation trust check: parse attestationObject fmt/attStmt, verify packed and fido-u2f self-attestation signatures, verify x5c leaf certificate signatures when the crypto backend is present, echo AAGUID and credential material, and state the trust level (FIDO MDS not configured; never overstated).

## Output

Returns a JSON object indicating whether verification succeeded (ok: true/false), the parsed attestation format (fmt), the AAGUID extracted from the authenticator data, echoed credential material, and a trust level string — with the caveat that FIDO MDS is not configured so trust is never overstated.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": true
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "ok": true
    }
   },
   "additionalProperties": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ddg-webauthn-attestation-trust-check-e04f3fa2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.daedalusdevelopmentgroup.com](https://www.zero.xyz/host/agents.daedalusdevelopmentgroup.com/llms.txt)