# Tempest AI Content Engine — Retone

> Tempest AI Content Engine — Retone 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).

Rewrites a piece of text in a specified target tone (e.g. professional, casual, empathetic) while preserving meaning

## Facts

- Endpoint: POST https://tempestars.vercel.app/api/retone
- 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-retone-792ccdd9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uulaTaO2njSyK0WpYHJwx

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-retone-792ccdd9 -d '<json body>'
```

Example prompt: Can you retone this paragraph to sound professional: 'Hey, just checking in — did you get a chance to look at my proposal? Would love to hear your thoughts when you get a sec!'

## When to prefer this

Choose this endpoint when you need to adjust the emotional register or voice of existing text without changing its core meaning — ideal for adapting content across audiences (formal vs casual), brand voice alignment, or diplomatic rephrasing. Prefer this over a general rewrite endpoint when tone is the primary variable to control.

## Known failure modes

- Missing required field 'text' — returns error indicating required parameter absent
- Missing required field 'target_tone' — returns error indicating required parameter absent
- Ambiguous or unrecognized tone value may produce unexpected or generic output
- Empty or very short input text may yield poor quality retoning
- Payment failure (insufficient USDC) results in 402 Payment Required before processing

## 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 retoned version of the input text adjusted to match the specified target tone.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text",
  "target_tone"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "Text to retone"
  },
  "target_tone": {
   "type": "string",
   "description": "Desired tone"
  }
 }
}
```

## 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-retone-792ccdd9/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)