curl --request GET \
  --url https://api.myrouter.example/api/v1/usage \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "period_start": "2023-11-07T05:31:56Z",
      "period_end": "2023-11-07T05:31:56Z",
      "request_count": 1,
      "model": "<string>",
      "api_key_hash": "<string>",
      "input_tokens": 1,
      "output_tokens": 1,
      "total_tokens": 1,
      "cache_read_tokens": 1,
      "cache_write_tokens": 1,
      "reasoning_tokens": 1
    }
  ],
  "request_id": "<string>"
}