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JWT Decoder
x402
JWT Decoder is a paid API for AI agents from conclavex402.pythonanywhere.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-18).
Decodes a JWT token by parsing its header and payload claims without performing signature verification.
Price / call$0.005
Success—
StatusUnknown
How this service works
Decode a JWT — parse header and payload claims without a key (no signature verification).
Output
Returns a JSON object with two fields: 'header' containing the decoded JWT header claims (e.g. alg, typ) and 'payload' containing the decoded JWT payload claims (e.g. sub, iat, exp, custom claims). No signature verification is performed.
Example use cases
Debugging an expired auth token
“I'm getting a 401 error and want to check what's inside this JWT to see its expiry and subject — can you decode it for me: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsImV4cCI6MTY5MDAwMDAwMH0.abc123”
Inspecting algorithm used in token
“Can you parse this JWT and tell me what signing algorithm is listed in the header: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJkYXRhIjoidGVzdCJ9.xyz”
Extracting user claims from token
“I need to read the user ID and roles out of this JWT without verifying the signature — just parse the payload: eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.eyJzdWIiOiJ1c2VyXzQ1NiIsInJvbGVzIjpbImFkbWluIl19.”
Technical details
Endpoint
POSThttps://conclavex402.pythonanywhere.com/u/jwt?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to quickly inspect or extract the header and payload claims from a JWT token without needing to verify its signature — ideal for debugging, logging, or reading claims in a trusted internal context. Not appropriate when signature verification is required for security enforcement.
Side effects
- Malformed or non-JWT string input returns an error
- Missing required 'input' body field causes validation failure
- Token with invalid base64url encoding in header or payload fails to decode
- Passing an empty string or non-string JWT value returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"header": {
"alg": "none"
},
"payload": {
"sub": "1"
}
}
}Tags
x402
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