curl --request POST "https://gptproto.com/v1/chat/completions" \
  --header "Authorization: Bearer $GPTPROTO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
    "model": "grok-4.6",
    "messages": [
      {
        "role": "user",
        "content": "Hello"
      }
    ]
  }'