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PennyRail JWT Decode
x402
PennyRail JWT Decode is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Decodes a JWT (JSON Web Token) and returns its header, payload, and signature components without verification
Price / call$0.05
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns the decoded JWT broken into its three components: the header object (containing algorithm and token type), the payload object (containing all claims such as sub, iat, exp, iss, and any custom fields), and the raw signature string — all without performing cryptographic signature verification.
Example use cases
Inspect access token expiration
“I have this access token from our auth server — can you decode it and tell me when it expires and who it belongs to? Here's the token: eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsImV4cCI6MTcwMDAwMDAwMH0.abc123”
Debug OAuth token claims
“Our OAuth flow is returning unexpected permissions — can you decode this JWT and list all the claims inside it so I can see what scopes and roles are being set? Token: eyJhbGciOiJIUzI1NiJ9.eyJyb2xlIjoiYWRtaW4iLCJzY29wZXMiOlsicmVhZCIsIndyaXRlIl19.xyz789”
Extract user identity from session token
“I need to know the user ID and email stored in this session JWT without making a database call — can you pull that info out of the token? eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiI0MiIsImVtYWlsIjoidGVzdEB0ZXN0LmNvbSJ9.signature”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/skill/jwt.toolkit--jwt-decodeWhen to prefer
Choose this endpoint when you need to quickly inspect the contents of a JWT without implementing base64url decoding yourself, when debugging authentication flows to see what claims a token carries, or when you need to extract fields like expiration time or user identity from a token in an automated pipeline. It is not a verification service — if you need to validate the token signature, use a dedicated JWT verification endpoint instead.
Side effects
- Malformed or non-JWT string input returns an error response
- Missing 'input' field or empty object causes validation failure
- Token with non-standard encoding may fail to parse
- Payment failure (402) if USDC balance is insufficient
- Network timeout on the Vercel serverless function cold start
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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