curl --request GET \
  --url https://api.amberdata.com/market/metrics/{asset}/supply/latest \
  --header 'x-api-key: <api-key>'

{
  "status": 200,
  "title": "OK",
  "description": "Successful request",
  "payload": {
    "timestamp": "2021-01-26T16:25:49.000Z",
    "issuance": "6.25",
    "totalSupply": "18611089.79497096",
    "circulatingSupply": "18611056",
    "maxSupply": "21000000"
  }
}