gpt-4o-mini-tts (text to audio)

curl -X POST "https://gptproto.com/v1/audio/speech" \
  -H "Authorization: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-4o-mini-tts",
  "input": "The quick brown fox jumped over the lazy dog.",
  "voice": "alloy"
}'

{
  "error": {
    "message": "Invalid signature",
    "type": "401"
  }
}