curl --request GET \
  --url https://api.metrito.com/v3/fields \
  --header 'Authorization: Bearer <token>'

{
  "fields": [
    {
      "key": "spend",
      "name": "Investimento",
      "short_name": "Invest.",
      "description": "Valor gasto em anúncios",
      "type": "measure",
      "data_type": "currency",
      "display_type": "currency",
      "source_key": "v3-ads",
      "sources": [
        "meta_ads",
        "google_ads",
        "tiktok_ads"
      ],
      "good_direction": "down",
      "available": true,
      "filterable": true,
      "sortable": true
    },
    {
      "key": "ctr",
      "name": "CTR",
      "short_name": "CTR",
      "description": "Taxa de clique (clicks / impressions)",
      "type": "measure",
      "data_type": "percentage",
      "display_type": "percentage",
      "source_key": "v3-ads",
      "sources": [
        "meta_ads",
        "google_ads",
        "tiktok_ads"
      ],
      "good_direction": "up",
      "available": true,
      "filterable": false,
      "sortable": true
    }
  ],
  "count": 2,
  "source": "v3-ads",
  "timestamp": "2026-03-15T12:00:00.000Z"
}