# klymax402 JWT Decoder

> klymax402 JWT Decoder is a paid API for AI agents from klymax402.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Decodes a JWT token into its header, payload/claims, algorithm, type, and signature presence without verifying the signature

## Facts

- Endpoint: GET https://klymax402.com/api/jwt-decoder/api/decode
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/klymax402-jwt-decoder-7b4a1cdd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BcICfhNwCwjzEAfOrsK6x

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 klymax402-jwt-decoder-7b4a1cdd
```

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

## When to prefer this

Use this endpoint when you need to quickly inspect the contents of a JWT — its claims, header metadata, algorithm, and type — without performing full cryptographic verification. Ideal for debugging, logging, or extracting user info from tokens in automated workflows. Prefer this over a full JWT validation endpoint when you only need to read the token contents, not verify its authenticity.

## Known failure modes

- Malformed JWT (not in header.payload.signature format) returns an error
- Empty or missing token parameter returns a validation error
- Non-JWT strings (e.g. opaque tokens) cannot be decoded and will error
- Payment failure or insufficient USDC balance results in 402 response

## How this service works

One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.

## Output

Returns a JSON object containing the decoded header (with algorithm and token type), the payload/claims object (all key-value pairs from the token body), a signature presence boolean, the algorithm name, and the token type — all without performing cryptographic signature verification.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "claims": {},
  "header": {},
  "payload": {},
  "algorithm": "example",
  "tokenType": "example",
  "hasSignature": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/klymax402-jwt-decoder-7b4a1cdd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from klymax402.com](https://www.zero.xyz/host/klymax402.com/llms.txt)