curl --request GET \
  --url https://supertoneapi.com/v1/voices/{voice_id} \
  --header 'x-sup-api-key: <x-sup-api-key>'

{
  "voice_id": "<voice-id>",
  "name": "Agatha",
  "description": "",
  "age": "young-adult",
  "gender": "female",
  "use_case": "narration",
  "use_cases": [
    "narration",
    "storytelling"
  ],
  "language": [
    "ko",
    "en",
    "ja"
  ],
  "styles": [
    "kind-default",
    "normal",
    "serene"
  ],
  "models": [
    "sona_speech_1"
  ],
  "samples": [
    {
      "language": "ko",
      "style": "kind-default",
      "model": "sona_speech_1",
      "url": "https://example.com/samples/sample-audio.wav"
    }
  ],
  "thumbnail_image_url": "https://example.com/thumbnails/voice-thumbnail.png"
}