curl --request GET \
  --url https://api.blockworks.com/v1/metrics/{identifier} \
  --header 'x-api-key: <api-key>'

{
  "Bitcoin": {
    "date": "2000-12-31",
    "value": 1
  },
  "Ethereum": {
    "date": "2000-12-31",
    "value": 2
  }
}