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/nu1qtd4wv5mxa5vefya67krammdpwe7cxw0x44amsx{
"isvalid": true,
"address": "nu1qtd4wv5mxa5vefya67krammdpwe7cxw0x44amsx",
"scriptPubKey": "00145b6ae65366ed199493baf587ddeda1767d8339e6",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "5b6ae65366ed199493baf587ddeda1767d8339e6"
}