# agentshelf.syntexa.ch JWT Parts Decoder

> agentshelf.syntexa.ch JWT Parts Decoder is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Decodes a JWT token into its header and payload components without verifying the signature

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/jwt-parts?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-jwt-parts-decoder-e7f358b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_13Z2GQYsRzamWtsHXama7

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 agentshelf-syntexa-ch-jwt-parts-decoder-e7f358b8 -d '<json body>'
```

Example prompt: Can you decode this JWT for me and show me the header and payload? eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c — I just want to see what's inside, no need to verify it.

## When to prefer this

Choose this endpoint when you need to inspect JWT header or payload fields without caring about signature validity — for example during debugging, audit, or claim extraction workflows. It is a paid alternative to the free POST /v1/sandbox/jwt-parts endpoint on the same host; prefer the sandbox version if available. Do not use this endpoint when you need cryptographic verification that the token is authentic and untampered.

## Known failure modes

- Malformed or non-JWT input string returns an error indicating invalid token format
- Input that is not a valid base64url-encoded JWT structure fails to parse
- Missing or empty text field returns a validation error
- Token with fewer than three dot-separated segments is rejected
- Very large token strings may be truncated at the 100,000 character limit

## How this service works

Call when an agent needs a decoded JWT header and payload with no signature check. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/jwt-parts first.

## Output

Returns the decoded JWT header and payload as structured JSON objects, revealing all claims and header fields such as algorithm (alg), type (typ), subject (sub), expiry (exp), issued-at (iat), and any custom claims — without performing any signature verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "examples": [
    "eyJhbGciOiJub25lIn0.eyJzdWIiOiJkZW1vIn0.sig"
   ],
   "maxLength": 100000,
   "minLength": 1,
   "description": "Input for this SKU. The route description says whether it is plain text, a URL, base64 bytes, or an already-encoded token."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-syntexa-ch-jwt-parts-decoder-e7f358b8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)