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PennyRail JWT Toolkit – Token Claims Extractor
x402
PennyRail JWT Toolkit – Token Claims Extractor 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).
Extracts and decodes claims from a JWT token, returning the parsed payload and header information
Price / call$0.05
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing the decoded JWT header (algorithm, token type) and payload claims (subject, issuer, audience, expiration, issued-at, and any custom claims present in the token). Does not perform cryptographic signature verification — only structural decoding and claims extraction.
Example use cases
Inspect auth token from login flow
“I have a JWT my auth server just issued and I want to know the exact claims inside it — sub, iat, exp, roles, everything. Here's the token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsInJvbGVzIjpbImFkbWluIl0sImV4cCI6MTcwMDAwMDAwMH0.abc123”
Verify token expiry before API call
“Before I make this API call, can you decode this bearer token and tell me when it expires and who issued it? Token: eyJhbGciOiJSUzI1NiJ9.eyJpc3MiOiJodHRwczovL2lkcC5leGFtcGxlLmNvbSIsImV4cCI6MTcwMTAwMDAwMCwic3ViIjoic3ZjX2FjY291bnQifQ.sig”
Extract user identity from incoming request token
“A request came in with this Authorization header token and I need to know the user's ID and what permissions are claimed inside it without calling the auth server: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VySWQiOiJ1c3JfNzg5IiwicGVybWlzc2lvbnMiOlsicmVhZCIsIndyaXRlIl19.xyz”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/skill/jwt.toolkit--token-claimsWhen to prefer
Choose this endpoint when you need a quick, pay-per-use JWT claims extraction without setting up a local JWT library or auth SDK. Useful in agent pipelines where you receive an opaque token and need to inspect its claims programmatically. Not suitable if you need cryptographic signature verification — use a full JWT verification service for that.
Side effects
- Malformed JWT string (not three base64url segments) returns an error
- Empty or missing input token returns a validation error
- Heavily padded or non-standard JWT encoding may fail to parse
- Network timeout on the Vercel serverless function
- Payment failure via x402 protocol blocks the request before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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