# Sindri JWT Decoder

> Sindri JWT Decoder is a paid API for AI agents from x402.outpimp.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Decodes a JWT by base64url-decoding its header and payload segments without verifying the signature.

## Facts

- Endpoint: POST https://x402.outpimp.com/jwtDecode
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sindri-jwt-decoder-e0fa7205
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BCtEihWpZEWxGhROeGjV0

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 sindri-jwt-decoder-e0fa7205 -d '<json body>'
```

Example prompt: Can you decode this JWT for me and show me what's in the header and payload? Here's the token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

## When to prefer this

Use this endpoint when you need to quickly inspect the contents of a JWT — such as reading claims, checking expiration, or identifying the algorithm — and you do not need signature verification. Do not use this for authenticating or trusting a token; it cannot validate that the token is genuine or unmodified.

## Known failure modes

- Malformed JWT string (not three dot-separated segments) causes a parsing error
- Non-base64url-encoded segments cause decoding failure
- Empty or missing token field returns a validation error
- Passing a non-JWT token string (e.g. opaque token) yields garbled or error output

## How this service works

Decodes (does not verify) a JWT by base64url-decoding its header and payload segments. Signature validity is never checked — do not use this to authenticate a token.

## Output

Returns the base64url-decoded header object (e.g. algorithm, token type) and decoded payload object (e.g. sub, iat, exp, custom claims) from the JWT. The signature is not verified — only the raw decoded content is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "token": {
   "type": "string",
   "description": "A JWT string (header.payload.signature)."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sindri-jwt-decoder-e0fa7205/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.outpimp.com](https://www.zero.xyz/host/x402.outpimp.com/llms.txt)