curl --request GET \
  --url https://api.givingcompass.org/insights/impact/metrics \
  --header 'X-API-Key: <api-key>'

{
  "items": [
    {
      "metric_id": "<string>",
      "ein": "<string>",
      "metric_text": "<string>",
      "metric_type": "<string>",
      "metric_value": 123,
      "unit": "<string>",
      "geo_impact": "<string>",
      "time_aggregation": "<string>",
      "time_aggregation_text": "<string>",
      "source_snippet": "<string>",
      "url": "<string>",
      "report_year": 123,
      "date_added": "<string>"
    }
  ],
  "total": 123,
  "page": 123,
  "size": 123
}