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JWT Decode & Verify
x402
JWT Decode & Verify is a paid API for AI agents from agent-chain-kit-solana.vercel.app, paid per call via x402, $0.0005/call, status unknown (last checked 2026-10-10).
Decodes a JWT token and returns its header, payload, and signature verification status
Price / call$0.0005
Success—
StatusUnknown
How this service works
Global current weather, hourly forecasts, foreign-exchange rates, EVM reads, and deterministic utilities for AI agents. Pay per call with MPP or x402; no API key.
Output
A JSON object containing the decoded JWT header (e.g. algorithm), the decoded payload (e.g. subject, claims, expiry), and a boolean signature_verified field indicating whether the signature was cryptographically validated.
Example use cases
Inspect auth token claims
“I have this JWT from our auth service and I need to see what claims are inside it — can you decode eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMiLCJyb2xlIjoiYWRtaW4ifQ.abc123 and show me the payload?”
Check JWT expiration fields
“Can you decode this JWT token and tell me the expiry and subject fields? Here it is: eyJhbGciOiJSUzI1NiJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsImV4cCI6MTcwMDAwMDAwMH0.signature”
Verify token algorithm in header
“I need to know what signing algorithm this JWT is using — can you decode eyJhbGciOiJIUzM4NCJ9.eyJzdWIiOiJ0ZXN0In0.sig and show me the header?”
Technical details
Endpoint
POSThttps://agent-chain-kit-solana.vercel.app/v1/jwt-decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, keyless, pay-per-call JWT decode without setting up a library or auth infrastructure. Ideal for agents that need to inspect token contents on the fly, check claims, or audit token structure without maintaining API keys. Not suited for issuing or signing new JWTs.
Side effects
- Malformed or non-JWT token string returns a parse error
- Missing 'token' query parameter causes a validation failure
- Signature verification returns false if the secret key is unknown or not provided
- Expired or revoked tokens are decoded but flagged accordingly in the payload claims
- Method mismatch (only GET/HEAD/DELETE accepted) returns a 405 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"header": {
"alg": "HS256"
},
"payload": {
"sub": "123"
},
"signature_verified": false
}
}Tags
x402
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