curl --request GET \
  --url https://api.blockworks.com/v1/metrics/etf-flows-usd \
  --header 'x-api-key: <api-key>'

{
  "projectName": [
    {
      "date": "2025-08-10",
      "value": 123456.789
    },
    {
      "date": "2025-08-11",
      "value": 234567.89
    },
    {
      "date": "2025-08-12",
      "value": 345678.901
    }
  ]
}