WBA Thumbprint Validator

x402

WBA Thumbprint Validator is a paid API for AI agents from witness.holoweave.org, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Validates that a given keyid matches the RFC 7638 thumbprint of a key published in an agent's JWKS key directory

Price / call$0.01

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How this service works

Web bot auth debugging for AI agents, priced per check at $0.01. RFC 7638 keyid thumbprint verification, RFC 9421 Ed25519 signature verification, and per-verifier acceptance rules. Signed attestations, published fixtures, sources with dates.

Output

Returns whether the provided keyid matches the RFC 7638 thumbprint of any key found at the specified JWKS key directory, allowing the caller to confirm key identity consistency before or during HTTP message signature workflows.

Example use cases

Pre-flight key consistency check

“Before my agent starts signing requests, verify that the keyid 'agt-key-01' matches a key published at https://agent.myplatform.io/.well-known/http-message-signatures-directory so I know the thumbprint is correct.”

Debugging rejected signature keyid

“My HTTP message signatures keep getting rejected — can you check if keyid 'ed25519-prod-2024' corresponds to any key in my JWKS at https://api.myservice.com/.well-known/http-message-signatures-directory?”

Validating Signature-Input keyid from incoming request

“I received a Signature-Input header of 'sig1=("@method" "@path");keyid="agent-key-7";created=1700000000' — can you check whether that keyid is a valid RFC 7638 thumbprint for something published at https://partner-agent.example.com/.well-known/http-message-signatures-directory?”

Technical details

Endpoint

POSThttps://witness.holoweave.org/v1/wba-thumbprint

When to prefer

Use this endpoint when you need to confirm that a keyid used in HTTP message signatures (RFC 9421 / WBA) actually corresponds to a key the agent has published in its JWKS directory. This is specifically useful before initiating signed API calls, when debugging signature rejections, or when onboarding a new agent identity and verifying that key material is consistent. Prefer this over full signature verification when you only need to validate key identity, not an actual signature.

Side effects

Key directory URL is unreachable or returns non-200 — validation cannot proceed
No key in the JWKS matches the provided keyid thumbprint — returns mismatch
Malformed keyid or JWKS document — parsing error returned
key_directory is not a valid HTTPS URI — rejected at input validation
Neither keyid nor signature_input provided — required field missing error

Output

Schema · Response

{
  "example": {
    "signature": {
      "alg": "ed25519",
      "value": "base64...",
      "key_id": "aw-attest-2026-08"
    },
    "attestation": {
      "verdict": "fail",
      "endpoint": "wba-thumbprint",
      "evidence": {
        "keys_found": 1,
        "published_thumbprints": [
          "poqkLGiymh_W0uP6PZFw-dvez3QJT5SolqXBCW38r0U"
        ]
      },
      "findings": [
        {
          "code": "KEYID_IS_KID_NOT_THUMBPRINT",
          "detail": "keyid matches the kid of key 0 but NOT its RFC 7638 thumbprint.",
          "severity": "blocking"
        }
      ]
    }
  }
}

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How this service works

Output

Example use cases

Pre-flight key consistency check

Debugging rejected signature keyid

Validating Signature-Input keyid from incoming request

Technical details

Endpoint

POSThttps://witness.holoweave.org/v1/wba-thumbprint

When to prefer

Side effects

Key directory URL is unreachable or returns non-200 — validation cannot proceed
No key in the JWKS matches the provided keyid thumbprint — returns mismatch
Malformed keyid or JWKS document — parsing error returned
key_directory is not a valid HTTPS URI — rejected at input validation
Neither keyid nor signature_input provided — required field missing error

Output

Schema · Response

{
  "example": {
    "signature": {
      "alg": "ed25519",
      "value": "base64...",
      "key_id": "aw-attest-2026-08"
    },
    "attestation": {
      "verdict": "fail",
      "endpoint": "wba-thumbprint",
      "evidence": {
        "keys_found": 1,
        "published_thumbprints": [
          "poqkLGiymh_W0uP6PZFw-dvez3QJT5SolqXBCW38r0U"
        ]
      },
      "findings": [
        {
          "code": "KEYID_IS_KID_NOT_THUMBPRINT",
          "detail": "keyid matches the kid of key 0 but NOT its RFC 7638 thumbprint.",
          "severity": "blocking"
        }
      ]
    }
  }
}