curl --request GET \
  --url https://xbt-mainnet.gomaestro-api.org/v0/addresses/{address}/brc20 \
  --header 'api-key: <api-key>'

{
  "data": {
    "ABCD": {
      "available": "0.123",
      "total": "312000.000"
    }
  },
  "last_updated": {
    "block_hash": "000000009ed3f5385c1807ca04630b9b2273398670726f93282fd41ba88dc6b8",
    "block_height": 2413542
  }
}