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/nu1qq7pwlxe266vzu3rlzu23kn5a764h4cz508pdcx{
"isvalid": true,
"address": "nu1qq7pwlxe266vzu3rlzu23kn5a764h4cz508pdcx",
"scriptPubKey": "00140782ef9b2ad6982e447f17151b4e9df6ab7ae054",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "0782ef9b2ad6982e447f17151b4e9df6ab7ae054"
}