curl --request GET \
  --url https://os.gan.ai/v1/voices \
  --header 'ganos-api-key: <api-key>'

{
  "data": [
    {
      "voice_id": "<string>",
      "voice_name": "",
      "voice_description": "",
      "voice_sample": ""
    }
  ],
  "total_voices": 123
}