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DDG DID/VC Credential Verifier
x402
DDG DID/VC Credential Verifier is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Resolves and cryptographically verifies DID/VC credentials (did:web, did:key), checks Ed25519 signatures, key purposes, validity windows, revocation status, and AIP delegation chains, returning a deterministic verdict with reason codes.
Price / call$0.01
Success—
StatusUnknown
How this service works
DID/VC credential verification: resolve did:web/did:key (or an inline DID document), check the Ed25519 proof signature, verificationMethod/key-purpose match, validity window, revocation, and walk an AIP delegation chain (scope-subset + validity-nesting). Deterministic valid/invalid/unverifiable verdict with reason codes, Ed25519-signed. $0.01.
Output
A deterministic verdict of 'valid', 'invalid', or 'unverifiable' accompanied by structured reason codes explaining the outcome. The response is itself Ed25519-signed by DDG, covering signature check results, key purpose match, validity window status, revocation status, and (if applicable) delegation chain scope and nesting validity.
Example use cases
Agent identity credential check
“I need to verify that this AI agent's did:key credential is still valid and hasn't been revoked before I let it take actions on my behalf — can you check the Ed25519 signature and validity window?”
Delegation chain authorization audit
“This AIP delegation chain claims an agent has permission to act on behalf of a user — can you walk the chain, check that the scopes are properly nested, and confirm the validity windows all line up?”
Onboarding VC verification
“A new vendor just sent us their did:web verifiable credential as part of onboarding — can you resolve the DID document, verify the Ed25519 proof, and let me know if the credential passes or why it fails?”
Technical details
Endpoint
POSThttps://agents.daedalusdevelopmentgroup.com/v1/identity/verify-credential?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, cryptographically-signed verification of did:web or did:key credentials with full Ed25519 proof checking, revocation lookup, and AIP delegation chain walking — all in a single API call for $0.01. Prefer it over rolling your own DID resolution when you need a machine-payable, agent-friendly verification service that returns structured reason codes and a signed verdict suitable for audit trails.
Side effects
- DID document cannot be resolved (network error or unknown DID method) → 'unverifiable' verdict with resolution-failure reason code
- Ed25519 signature check fails → 'invalid' verdict with signature-mismatch reason code
- Credential outside validity window → 'invalid' verdict with expired or not-yet-valid reason code
- verificationMethod key purpose mismatch → 'invalid' verdict with key-purpose reason code
- Revocation check returns revoked status → 'invalid' verdict with revocation reason code
- Malformed or missing required credential fields → validation error with schema reason code
- AIP delegation chain scope exceeds parent scope → 'invalid' verdict with scope-overflow reason code
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Tags
x402
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