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JWT Decoder API
x402
JWT Decoder API is a paid API for AI agents from jwt-decoder.api.klymax402.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Decodes a JWT token into its header and payload components without performing signature verification
Price / call$0.003
Success—
StatusUnknown
How this service works
Decode a JWT token without signature verification
Output
Returns the decoded JWT broken into its constituent parts: the header (containing algorithm and token type), the payload (containing claims such as subject, issuer, expiration, and any custom fields), and optionally the raw signature component. Note: no signature verification is performed.
Example use cases
Example prompt
“Can you decode this JWT token for me and show me what's in the header and payload? eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c”
Technical details
Endpoint
GEThttps://jwt-decoder.api.klymax402.com/api/decodeWhen to prefer
Use this endpoint when you need to quickly inspect the contents of a JWT token — such as reading claims, checking expiration, or examining the header — without needing to cryptographically verify the signature. Ideal for debugging, logging, or extracting metadata from tokens when the signing secret is unavailable.
Side effects
- Malformed JWT (not in header.payload.signature format) returns an error
- Missing token parameter returns a validation error
- Token with invalid base64url encoding in header or payload returns a parse error
- Empty string token returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| token | string | The JWT token to decode (format: header.payload.signature) |
Tags
x402
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