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Quartermaster JWT Decoder
x402
Quartermaster JWT Decoder is a paid API for AI agents from quartermaster.surewhynot.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Decodes a JWT token's header and payload into readable JSON without verifying the signature.
Price / call$0.001
Success—
StatusUnknown
How this service works
Decode a JWT header and payload (signature not verified).
Output
Returns the decoded JWT header and payload as structured JSON objects, exposing all claims such as sub, iat, exp, iss, and any custom fields. Signature is NOT verified.
Example use cases
Example prompt
“Can you decode this JWT for me and show me what's in the header and payload — I don't need signature verification, just want to read the claims: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c”
Technical details
Endpoint
GEThttps://quartermaster.surewhynot.app/v1/jwt-decodeWhen to prefer
Use this endpoint when you need to quickly inspect the contents of a JWT token — such as reading expiration time, subject, issuer, or custom claims — without needing to verify its cryptographic signature. Ideal for debugging, logging, or extracting metadata from tokens where trust verification is handled separately.
Side effects
- Malformed or non-JWT string returns an error indicating invalid token format
- Missing 'token' query parameter returns a validation error
- Token with fewer than 3 segments (not a valid JWT structure) fails to decode
- Extremely long tokens may be rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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