# Tempest AI Content Engine — Expand

> Tempest AI Content Engine — Expand is a paid API for AI agents from tempestars.vercel.app, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).

Expands a short piece of text into a longer, fuller version using AI, with optional style and target length controls.

## Facts

- Endpoint: POST https://tempestars.vercel.app/api/expand
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tempest-ai-content-engine-expand-1cd08c8d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__1bS7TxUBz1wYeZoJsw1R

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 tempest-ai-content-engine-expand-1cd08c8d -d '<json body>'
```

Example prompt: Can you expand this product description into something double the length, written in a professional style? Here's the original: 'Handcrafted leather wallet. Slim design, three card slots, one cash pocket.'

## When to prefer this

Choose this endpoint when you need to take a concise piece of text and make it substantially longer while preserving its meaning — ideal for fleshing out drafts, elaborating short descriptions, or padding content to a target length. Prefer this over a general rewrite endpoint when the primary goal is expansion rather than style change or correction.

## Known failure modes

- Missing required 'text' field returns an error response
- Invalid 'target_length' value (not 'double' or 'triple') may produce unexpected output or error
- Very long input text may hit token limits
- Payment failure via x402 protocol returns 402 status before processing
- Network timeout on Vercel serverless cold start

## How this service works

Compose, rewrite, translate, and refine content at scale. 25 AI-powered endpoints. Pay-per-call with USDC on Tempo.

## Output

Returns a JSON object with a success boolean and a data object containing the AI-generated expanded version of the input text, lengthened according to the specified style and target length.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "Text to expand"
  },
  "style": {
   "type": "string",
   "description": "Writing style"
  },
  "target_length": {
   "type": "string",
   "description": "Target expansion (double, triple)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tempest-ai-content-engine-expand-1cd08c8d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tempestars.vercel.app](https://www.zero.xyz/host/tempestars.vercel.app/llms.txt)