# NexusAPI JWT Decode

> NexusAPI JWT Decode is a paid API for AI agents from nexus-api-peach-nine.vercel.app, paid per call via x402, $0.160058/call, status unknown (last checked 2026-09-14).

Decodes a JWT (JSON Web Token) to extract its header, payload, and signature components without verifying the signature

## Facts

- Endpoint: POST https://nexus-api-peach-nine.vercel.app/api/tools/jwt/decode
- Price: $0.160058/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexusapi-jwt-decode-4e1deedf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iqnV6BWwfc283YvZX5uXy

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 nexusapi-jwt-decode-4e1deedf -d '<json body>'
```

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

## When to prefer this

Use this endpoint when you need to quickly inspect or extract claims from a JWT token without running a full verification pipeline. Ideal for debugging, logging, or reading token metadata when the signing secret is unavailable or irrelevant. Not suitable when you need to cryptographically verify the token's authenticity.

## Known failure modes

- Malformed JWT string returns a parsing error
- Empty or missing query input returns a 400-level error
- Non-JWT base64 strings may produce garbage output or error
- Network or server errors return 5xx responses
- Payment failure results in 402 response before decoding occurs

## How this service works

Crypto, AI, Social Media, Finance, Weather, Tools &amp; more. Pay per call in USDC on Base. No API keys.

## Output

Returns the decoded JWT broken into its three parts: the header (algorithm and token type), the payload (claims such as sub, iat, exp, name, roles), and the raw signature — all presented in human-readable JSON format without signature verification

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Search query or input parameter"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "description": "API response data"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexusapi-jwt-decode-4e1deedf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nexus-api-peach-nine.vercel.app](https://www.zero.xyz/host/nexus-api-peach-nine.vercel.app/llms.txt)