curl --request GET \
  --url https://prod.featherhq.com/api/v1/available-voices \
  --header 'X-API-Key: <api-key>'

{
  "voices": [
    {
      "id": "<string>",
      "name": "<string>",
      "description": "<string>",
      "voiceId": "<string>",
      "voiceSampleUrl": "<string>",
      "photoUrl": "<string>",
      "model": "<string>",
      "languages": "<string>",
      "accent": "<string>",
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "languageId": "<string>"
    }
  ]
}