curl --request GET \
  --url https://openrouter.ai/api/v1/analytics/meta \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "dimensions": [
      {
        "display_label": "Model",
        "name": "model"
      }
    ],
    "granularities": [
      {
        "display_label": "Day",
        "name": "day"
      }
    ],
    "metrics": [
      {
        "display_format": "number",
        "display_label": "Request Count",
        "is_rate": false,
        "name": "request_count"
      }
    ],
    "operators": [
      {
        "name": "eq",
        "value_type": "scalar"
      }
    ]
  }
}