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24KLabs Tone Shift
x402
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.
Price / call$0.007
Success—
StatusUnknown
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.
Example use cases
Formal email from casual draft
“I wrote this quick message to a client but it sounds too casual — can you rewrite it in a formal, professional tone? 'Hey! Just checking in — did you get a chance to look at the proposal? Let me know what you think!'”
Concise executive summary
“This paragraph is way too wordy for an executive summary. Rewrite it to be concise and to the point: 'Our new analytics platform, which has been in development for the past eighteen months by a dedicated cross-functional team, provides real-time visibility into key business metrics that were previously only accessible through lengthy manual reporting processes.'”
Persuasive product landing page copy
“Rewrite this product description in a persuasive tone to boost conversions: 'Our app lets users track their habits and set daily goals. It sends reminders and shows progress over time.'”
Technical details
Endpoint
POSThttps://api.24klabs.ai/api/v1/tone-shiftWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| tone | string |
Output
Schema · Response
{
"type": "json",
"example": {
"rewritten": "..."
}
}Tags
x402
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