import requests

url = "https://api.musicgpt.com/api/public/v1/audio_speed_changer"
headers = {"Authorization": "<API_KEY>"}

# Option 1: Use audio URL
payload = {
    "audio_url": "https://example.com/input_audio.mp3",
    "speed_change_factor": 1.5,
    "output_extension": "mp3"
}
response = requests.post(url, headers=headers, data=payload)
print(response.json())

# Option 2: Upload local audio file
payload = {
    "speed_change_factor": 1.25,
    "output_extension": "wav"
}
with open("input_audio.mp3", "rb") as f:
    files = {"audio_file": f}
    response = requests.post(url, headers=headers, data=payload, files=files)
print(response.json())

{
  "success": true,
  "conversion_id": "conv999",
  "credit_estimate": 45,
  "conversion_path": "https://example.com/output/converted_audio.mp3",
  "message": "Speed change task queued successfully"
}