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/nu1qw0zkdacmqpzdu677cpx55uwtfnzszdgx6vx674{
"isvalid": true,
"address": "nu1qw0zkdacmqpzdu677cpx55uwtfnzszdgx6vx674",
"scriptPubKey": "001473c566f71b0044de6bdec04d4a71cb4cc5013506",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "73c566f71b0044de6bdec04d4a71cb4cc5013506"
}