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

{
  "guardrails": {},
  "metadata": {},
  "observations": [
    {
      "date": "2023-12-25",
      "value": 123,
      "revised": true
    }
  ],
  "relatedIndicators": "<array>",
  "release": {}
}