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24K Labs Tone Shift
x402
24K Labs 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 2026-09-13).
Rewrites a given text in a specified tone (formal, friendly, concise, persuasive, etc.) while preserving original meaning.
Price / call$0.007
Success—
StatusUnknown
How this service works
Rewrite text in a requested tone (formal, friendly, concise, persuasive, etc.).
Output
Returns the rewritten text adjusted to the requested tone, preserving the original meaning and key information while changing the stylistic register, word choice, and sentence structure accordingly.
Example use cases
Formalizing a casual email draft
“I wrote this email to a client but it sounds too casual — can you rewrite it in a formal tone? Here it is: 'Hey! Just wanted to check in about the project. Let me know what you think and we can chat soon!'”
Making a support reply sound friendlier
“This customer support response sounds a bit cold and robotic — can you rewrite it in a friendly, warm tone? The text is: 'Your refund has been processed. It will appear in 5-7 business days. Contact us if you have further issues.'”
Tightening a product description to be concise
“This product description is too wordy — rewrite it in a concise tone and cut out the fluff: 'Our amazing and revolutionary new blender is truly the best blender you will ever own, designed with incredible precision for all your blending needs every single day.'”
Technical details
Endpoint
POSThttps://api.24klabs.ai/api/tone-shiftWhen to prefer
Choose this endpoint when you need to transform existing text into a specific tonal register (formal, friendly, persuasive, concise, etc.) without changing the underlying message. Ideal for content pipelines that need to adapt communications for different audiences, tone-of-voice consistency in brand writing, or polishing user-generated drafts before sending.
Side effects
- Empty or missing source text returns an error
- Unrecognized or unsupported tone value may return an error or default behavior
- Very long input text may be truncated or rejected
- Insufficient USDC balance (x402 payment failure) blocks the request
- Ambiguous tone specification may yield inconsistent results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| tone | string |
Output
Schema · Response
{
"type": "json",
"example": {
"rewritten": "..."
}
}Tags
x402
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