curl --request POST \
  --url https://api.httpayer.com/llm/chat \
  --header 'Content-Type: application/json' \
  --data '
{
  "messages": [
    {
      "role": "system",
      "content": "You are a helpful assistant"
    },
    {
      "role": "user",
      "content": "Hello, how are you?"
    }
  ],
  "model": "gpt-4o-mini",
  "temperature": 0.7
}
'

{
  "response": "<string>",
  "model": "<string>",
  "usage": {
    "prompt_tokens": 123,
    "completion_tokens": 123,
    "total_tokens": 123
  },
  "finish_reason": "<string>"
}