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/nu1quetc4r55qlqe5gquu82l3jn7gtgqf7xr5ug6tt{
"isvalid": true,
"address": "nu1quetc4r55qlqe5gquu82l3jn7gtgqf7xr5ug6tt",
"scriptPubKey": "0014e6578a8e9407c19a201ce1d5f8ca7e42d004f8c3",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "e6578a8e9407c19a201ce1d5f8ca7e42d004f8c3"
}