PennyRail JWT Toolkit

x402

PennyRail JWT Toolkit 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).

Signs, verifies, decodes, and manages JSON Web Tokens (JWTs) via a pay-per-call settlement endpoint

Price / call$0.05

Seller volume →—

Success—

StatusUnknown

How this service works

Machine-readable settlement service

Output

Returns a JSON object containing the decoded JWT header and payload claims, verification status (valid/invalid/expired), signature check result, and any error details if the token is malformed or the signature does not match.

Example use cases

Verify incoming API bearer token

“I have a bearer token from an incoming request — eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzQ1NiIsInJvbGUiOiJhZG1pbiJ9.xyz — can you verify it against the secret 'prod-secret-2024' and confirm whether the signature is valid and the token hasn't expired?”

Generate signed JWT for service auth

“Create a signed JWT with claims sub='service-worker-7', role='internal', and an expiration of 1 hour from now, signed with HS256 using the secret 'internal-svc-key'.”

Decode JWT claims for debugging

“Decode this JWT token and show me all the claims in the payload without verifying the signature — eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoiYWJjIiwicGxhbiI6InBybyJ9.signature — I just need to see what's inside it.”

Technical details

Endpoint

POSThttps://pennyrail.vercel.app/api/p/skill/jwt.toolkit--jwt-toolkit

When to prefer

Choose this endpoint when you need a lightweight, pay-per-call JWT operation without setting up a dedicated auth library or server — ideal for agents that occasionally need to sign, verify, or decode tokens as part of a workflow without persistent auth infrastructure. Suitable for serverless or ad-hoc token inspection tasks.

Side effects

Invalid or malformed JWT string returns a parse error
Wrong signing secret causes signature verification failure
Expired token returns an expiration error with exp claim details
Unsupported algorithm returns an unsupported algorithm error
Missing required input fields returns a validation error
Network or payment settlement failure returns a 402 or 5xx error

Input

Schema · Request body

Field	Type	Description
inputrequired	object

Output

Schema · Response

{
  "type": "object",
  "additionalProperties": true
}

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Example use cases

Verify incoming API bearer token

Generate signed JWT for service auth

“Create a signed JWT with claims sub='service-worker-7', role='internal', and an expiration of 1 hour from now, signed with HS256 using the secret 'internal-svc-key'.”

Decode JWT claims for debugging

Technical details

Endpoint

POSThttps://pennyrail.vercel.app/api/p/skill/jwt.toolkit--jwt-toolkit

When to prefer

Side effects

Invalid or malformed JWT string returns a parse error
Wrong signing secret causes signature verification failure
Expired token returns an expiration error with exp claim details
Unsupported algorithm returns an unsupported algorithm error
Missing required input fields returns a validation error
Network or payment settlement failure returns a 402 or 5xx error

Input

Schema · Request body

Field	Type	Description
inputrequired	object

Output

Schema · Response

{
  "type": "object",
  "additionalProperties": true
}