Brand-voice rewrite

Any copy → your brand voice. Describe the voice or paste a sample; get the rewrite and what changed.

POST /v1/rewrite$0.03/call · 3 credits, charged only on success

Send this

{
  "text": "We are pleased to announce our new feature is now available to all users.",
  "voice": "Confident, plain-spoken, a little wry. Short sentences.",
  "goal": "sound human",
  "length": "same"
}

Every response carries usage — the credits burned and your remaining balance. A failed call never burns credits.

Try it live against your own key in the interactive reference; every account gets 500 free credits a month, no card.

Get this back

{
  "rewritten": "It's live. Every account has the new feature as of today — go try it.",
  "changes": [
    "Dropped the press-release opener",
    "Active voice, shorter sentences"
  ],
  "usage": {
    "credits": 3,
    "balanceRemaining": 295
  }
}

Four ways in. Same $0.03/call.

curl

curl https://api.kynth.studio/v1/rewrite \
  -H "Authorization: Bearer ksk_live_…" \
  -H "Content-Type: application/json" \
  -d '{"text":"We are pleased to announce our new feature is now available to all users.","voice":"Confident, plain-spoken, a little wry. Short sentences.","goal":"sound human","length":"same"}'

TypeScript

import { KynthCore } from "@kynth/api";

const kynth = new KynthCore({ apiKey: process.env.KYNTH_API_KEY! });
const result = await kynth.rewrite({
  "text": "We are pleased to announce our new feature is now available to all users.",
  "voice": "Confident, plain-spoken, a little wry. Short sentences.",
  "goal": "sound human",
  "length": "same"
});

Python

from kynth import Kynth

client = Kynth(api_key=os.environ["KYNTH_API_KEY"])
result = client.rewrite(
    text="We are pleased to announce our new feature is now available to all users.",
    voice="Confident, plain-spoken, a little wry. Short sentences.",
    goal="sound human",
    length="same",
)

MCP

// One-time setup in your MCP client (Claude, Cursor, …):
{ "mcpServers": { "kynth-core": {
    "command": "npx", "args": ["@kynth/api-mcp"],
    "env": { "KYNTH_API_KEY": "ksk_live_…" } } } }

// Then the agent just calls the kynth_rewrite tool.

Brand-voice rewrite

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Four ways in. Same $0.03/call.

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