curl --request GET \
  --url https://macrobymark.com/api/indicators/discover/{provider}/{seriesKey} \
  --header 'X-API-Key: <api-key>'

{
  "discovery": {},
  "entry": {},
  "metadata": {},
  "observations": [
    {
      "date": "2023-12-25",
      "value": 123,
      "revised": true
    }
  ],
  "previewQuality": {},
  "release": {},
  "standardization": {}
}