curl --request POST 'https://api.voicecheap.ai/v1/actions/tts_generate' \
  --header "x-api-key: $VOICECHEAP_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{"requestId":"284a861a-4da8-4d67-ad48-8123e76c8e91","text":"Hello world.","voice":"933563129e564b19a115bedd57b7406a","inputType":"text","instructionPreset":"narrator","instructions":"Speak clearly and leave a short pause at the end.","speed":1,"sourceFileName":"launch-script.txt"}'

const input = {
  requestId: '284a861a-4da8-4d67-ad48-8123e76c8e91',
  text: 'Hello world.',
  voice: '933563129e564b19a115bedd57b7406a',
  inputType: 'text',
  instructionPreset: 'narrator',
  instructions: 'Speak clearly and leave a short pause at the end.',
  speed: 1,
  sourceFileName: 'launch-script.txt',
};
const response = await fetch('https://api.voicecheap.ai/v1/actions/tts_generate', {
  method: 'POST',
  headers: {
    'x-api-key': process.env.VOICECHEAP_API_KEY,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify(input),
});
const body = await response.json();
if (!response.ok) throw new Error(body.code + ': ' + body.message);
console.log(body);

import os
import requests

response = requests.post(
    "https://api.voicecheap.ai/v1/actions/tts_generate",
    headers={"x-api-key": os.environ["VOICECHEAP_API_KEY"]},
    json={"requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91", "text": "Hello world.", "voice": "933563129e564b19a115bedd57b7406a", "inputType": "text", "instructionPreset": "narrator", "instructions": "Speak clearly and leave a short pause at the end.", "speed": 1, "sourceFileName": "launch-script.txt"},
    timeout=120,
)
body = response.json()
if not response.ok:
    raise RuntimeError(f"{body.get('code')}: {body.get('message')}")
print(body)

{
  "data": {
    "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91",
    "status": "running",
    "pollAction": "action_request_get",
    "pollAfterSeconds": 5
  },
  "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91"
}

{
  "data": {
    "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91",
    "historyId": "722c80c6412edd4c3dcd625061e1c1feafbb0d54274d95fd8b5ca047f8cdd23d",
    "status": "completed",
    "characterCount": 12,
    "previewEndIndex": null,
    "downloadUrl": "https://files.example.com/launch-script-speech.mp3"
  },
  "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91"
}

{
  "data": {
    "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91",
    "operation": "tts_generate",
    "createdAt": 1792144800000,
    "updatedAt": 1792144820000,
    "status": "running",
    "pollAfterSeconds": 5
  },
  "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91"
}

{
  "data": {
    "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91",
    "operation": "tts_generate",
    "createdAt": 1792144800000,
    "updatedAt": 1792144820000,
    "status": "completed",
    "resultStored": false,
    "message": "The action completed. Retrieve its output from the corresponding history or resource action."
  },
  "requestId": "284a861a-4da8-4d67-ad48-8123e76c8e91"
}