# JWT Encode — Sign and Generate JSON Web Tokens

> JWT Encode — Sign and Generate JSON Web Tokens is a paid API for AI agents from apex-api-gamma.vercel.app, paid per call via x402, $0.119464/call, status unknown (last checked 2026-09-15).

Encodes and signs a payload into a JWT (JSON Web Token) string using standard algorithms

## Facts

- Endpoint: POST https://apex-api-gamma.vercel.app/api/tools/jwt/encode
- Price: $0.119464/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/jwt-encode-sign-and-generate-json-web-tokens-4579b050
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rX_8ICEwnhd0bg5gBIfOc

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-encode-sign-and-generate-json-web-tokens-4579b050 -d '<json body>'
```

Example prompt: Can you encode this payload into a JWT token: user_id=42, role=admin, expires in 1 hour?

## When to prefer this

Use this endpoint when you need to programmatically generate a JWT token from a custom payload without managing your own JWT signing infrastructure. Ideal for agents that need to produce authentication tokens on the fly, test JWT-based APIs, or encode claims as part of an automated workflow — all without requiring a dedicated auth server or API keys.

## Known failure modes

- Invalid or missing payload returns an error response
- Unsupported algorithm specification causes failure
- Malformed input schema results in 400-level error
- Service unavailability returns 5xx error
- Payment failure or insufficient USDC balance prevents call

## 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 a signed JWT token string that can be used as a bearer token for API authentication or authorization flows, encoding the provided claims/payload according to JWT standards.

## 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/jwt-encode-sign-and-generate-json-web-tokens-4579b050/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from apex-api-gamma.vercel.app](https://www.zero.xyz/host/apex-api-gamma.vercel.app/llms.txt)