Since this explorer is database-free, it doesn't natively support address balances & transaction history. However, you can check it in :
https://explorer.nusacoin.org/address/nu1qza44hqzvu272kv7gwgsxj3e6j4zv6w856rgmw7{
"isvalid": true,
"address": "nu1qza44hqzvu272kv7gwgsxj3e6j4zv6w856rgmw7",
"scriptPubKey": "0014176b5b804ce2bcab33c8722069473a9544cd38f4",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "176b5b804ce2bcab33c8722069473a9544cd38f4"
}