curl --request GET \
  --url https://xdg-mainnet.gomaestro-api.org/v0/addresses/{address}/balance \
  --header 'api-key: <api-key>'

{
  "data": "695100",
  "last_updated": {
    "block_hash": "000000000000000000005075404edd6edc806976389a9f7e2ff71db1c2cf9b83",
    "block_height": 884991
  }
}