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

{
  "items": [
    {
      "voice_id": "<string>",
      "name": "<string>",
      "description": "<string>"
    }
  ],
  "total": 25,
  "nextPageToken": "10"
}