# 24KLabs Tone Shift

> 24KLabs Tone Shift is a paid API for AI agents from api.24klabs.ai, paid per call via x402, $0.007/call, status unknown (last checked 2026-09-14).

Rewrites input text in a specified tone (formal, friendly, concise, persuasive, etc.) while preserving meaning.

## Facts

- Endpoint: POST https://api.24klabs.ai/api/v1/tone-shift
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/24klabs-tone-shift-bad1154b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__slxHB5jcuEFEyMZh2cpB

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 24klabs-tone-shift-bad1154b -d '<json body>'
```

Example prompt: Can you rewrite this paragraph in a persuasive tone? 'Our product reduces onboarding time by 40%. Teams adopt it quickly and report high satisfaction.' Make it sound compelling for a sales pitch.

## When to prefer this

Choose this endpoint when you need to transform existing text into a specific tone or register without changing the core meaning — ideal for rephrasing emails, marketing copy, customer communications, or professional documents. Prefer this over grammar-correction endpoints (which fix errors but don't shift tone) or full content generation endpoints (which create from scratch). Best suited for short to medium-length text where tone calibration is the primary goal.

## Known failure modes

- Empty or missing text input returns a validation error
- Unsupported or unrecognized tone value may return an error or default behavior
- Very long text inputs may be truncated or rejected
- Network timeout on slow connections
- Payment failure (insufficient USDC balance) blocks the request via x402 protocol

## How this service works

Rewrite text in a requested tone (formal, friendly, concise, persuasive, etc.).

## Output

The endpoint returns the rewritten version of the input text in the requested tone, preserving the original meaning while adjusting style, word choice, and sentence structure to match the target tone.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  },
  "tone": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "rewritten": "..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/24klabs-tone-shift-bad1154b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.24klabs.ai](https://www.zero.xyz/host/api.24klabs.ai/llms.txt)