# JWT Payload Decoder (No Signature Verification)

> JWT Payload Decoder (No Signature Verification) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Decodes and returns the payload of a JWT token without performing any signature verification

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/jwt-payload?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/jwt-payload-decoder-no-signature-verification-1921d5ce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tEYShYX3oFHieCaeGrAqm

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 jwt-payload-decoder-no-signature-verification-1921d5ce -d '<json body>'
```

Example prompt: Can you decode this JWT token and show me what's in the payload? Here's the token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c — I don't need signature verification, just the decoded claims.

## When to prefer this

Choose this endpoint when you need to quickly inspect the contents of a JWT token without caring about its cryptographic validity — for debugging, logging, extracting claims for display, or processing tokens whose signature is handled elsewhere. Prefer the free sandbox endpoint (/v1/sandbox/jwt-payload) for development and testing. Use this paid endpoint in production pipelines where reliability and consistent uptime matter.

## Known failure modes

- Malformed or non-JWT input string returns an error (not a valid three-segment base64url structure)
- Empty or missing 'text' field results in validation error
- Token with corrupted payload segment (invalid base64url) cannot be decoded
- Payment failure or insufficient USDC balance results in 402 response before processing

## How this service works

Call when an agent needs a decoded JWT payload with no signature check. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/jwt-payload first.

## Output

Returns the decoded JWT payload as a JSON object containing the claims embedded in the token's body segment, without any cryptographic signature validation. Typical fields include sub, iat, exp, and any custom claims the token issuer included.

## 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/jwt-payload-decoder-no-signature-verification-1921d5ce/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)