# Superhighway JWT Decoder

> Superhighway JWT Decoder is a paid API for AI agents from superhighway.walls.sh, paid per call via x402, $0.001/call, status down (last checked 2026-10-11).

Decodes and validates a JWT token, returning its claims payload

## Facts

- Endpoint: GET https://superhighway.walls.sh/jwt?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/superhighway-jwt-decoder-966f9018
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vCuw0ef8iymfGoyJdDfGC

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 superhighway-jwt-decoder-966f9018
```

Example prompt: Can you decode this JWT for me and show me what claims are inside: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyXzEyMyIsImV4cCI6MTcwMDAwMDAwMH0.abc123

## When to prefer this

Use this endpoint when you need to quickly inspect or debug a JWT token's contents, extract claims for logic decisions, or validate token structure without needing a full auth library. Useful when a lightweight, pay-per-call decode is preferred over maintaining a local JWT library.

## Known failure modes

- Invalid or malformed JWT string returns a parsing error
- Expired token may still be decoded but claims will show past expiry
- Missing token parameter returns a 400 bad request
- Completely random non-JWT string will fail to parse and return an error

## How this service works

Web search built for AI agents. Search the live web, pull recent news, and read any page as clean markdown — pay per call, free tier to start.

## Output

Returns the decoded JWT payload including all claims such as subject (sub), expiry (exp), issued-at (iat), and any custom claims embedded in the token, along with header information like algorithm and token type.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "token"
 ],
 "properties": {
  "token": {
   "type": "string",
   "description": "The JWT to decode (Bearer prefix tolerated)."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/superhighway-jwt-decoder-966f9018/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from superhighway.walls.sh](https://www.zero.xyz/host/superhighway.walls.sh/llms.txt)