# PennyRail JWT Toolkit Skill

> PennyRail JWT Toolkit Skill 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).

Executes a proven JWT toolkit skill via a paid micropayment-gated API endpoint for JWT operations

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/skill/jwt.toolkit--proven-skill-jwt-toolkit
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-jwt-toolkit-skill-a07b794a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__GdDDxGZ1VckJvybdgvl6

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability pennyrail-jwt-toolkit-skill-a07b794a -d '<json body>'
```

Example prompt: Can you use the JWT toolkit to verify this token for me: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIn0.dozjgNryP4J3jVmNHl0w5N_XgL0n3I9PlFUP0THsR8U, and tell me if the signature is valid and what claims it contains?

## When to prefer this

Choose this endpoint when you need a micropayment-gated, serverless JWT operation (sign, verify, decode) without managing your own JWT library or infrastructure. Particularly useful in agent workflows that already use x402 payment rails and need a quick, pay-per-use JWT utility. Prefer alternatives if you need high-volume batch JWT processing or have an existing JWT library integrated locally.

## Known failure modes

- Invalid or malformed JWT input returns an error describing the parse failure
- Expired token detected and flagged in the response
- Invalid signature reported when secret or key does not match
- Missing required fields in the input object cause a validation error
- Payment of $0.05 USDC not fulfilled results in HTTP 402 before execution
- Unsupported JWT algorithm returns an unsupported algorithm error

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object with the JWT toolkit operation result, which may include verified/decoded token claims, a newly signed JWT string, validation status, expiry details, algorithm info, and any errors encountered during processing.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-jwt-toolkit-skill-a07b794a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)