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SignalDesk AI JWT Decode
x402
SignalDesk AI JWT Decode is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).
Decodes a JWT token into its header, payload, and signature components without verifying the signature
Price / call$0.001
Success—
StatusUnknown
How this service works
Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.
Output
Returns a JSON object with three top-level keys: 'header' (containing alg, typ, and other header fields), 'payload' (containing all JWT claims such as sub, iat, exp, iss, aud, etc.), and 'signature_verified' (always false — this endpoint does not verify the signature). A 'warning' field is included reminding callers not to trust decoded claims for authentication purposes.
Example use cases
Debug expired auth token
“I'm getting a 401 error and I want to know what claims are in this JWT — can you decode it and tell me the expiry and subject? Token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImV4cCI6MTY5MDAwMDAwMH0.abc123”
Inspect third-party token structure
“We received this JWT from a partner API and I need to know what algorithm it uses and what fields are in the payload before we integrate it — can you decode it? eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJwYXJ0bmVyLmNvbSIsInJvbGUiOiJhZG1pbiJ9.xyz789”
Audit JWT claims in CI pipeline
“During our security audit I need to check that this access token contains the right 'aud' and 'scope' claims — decode it so I can verify the fields: eyJhbGciOiJIUzI1NiJ9.eyJhdWQiOiJteWFwcCIsInNjb3BlIjoicmVhZDp3cml0ZSJ9.defghi”
Technical details
Endpoint
POSThttps://x402-agent.kariguetoazul.workers.dev/api/encoding/jwt-decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to inspect or debug JWT token contents without performing signature verification — for example, reading expiry times, extracting claims for logging, auditing token structure, or understanding a third-party token format. Prefer this over a full JWT verification library when you explicitly do NOT need cryptographic validation and just want the decoded payload quickly. Not suitable when you need to authenticate a user or trust the claims for access control decisions.
Side effects
- Malformed JWT string (not three base64url segments) returns a parse error
- Token exceeding 4096 characters may be rejected
- Network/worker timeout if the Cloudflare Worker is cold-starting
- Missing or empty 'token' field returns a validation error
- Non-JWT strings (e.g. opaque tokens) will fail to parse
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | JWT token. Avoid sharing confidential credentials. |
Output
Schema · Response
{
"type": "json",
"example": {
"header": {
"alg": "HS256",
"typ": "JWT"
},
"payload": {
"sub": "123"
},
"warning": "Decoded claims are untrusted; do not use this result for authentication.",
"signature_verified": false
}
}Tags
x402
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