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/nu1q25xg3hzhyufrnpsjazshujfkc7dkx60hdegln5{
"isvalid": true,
"address": "nu1q25xg3hzhyufrnpsjazshujfkc7dkx60hdegln5",
"scriptPubKey": "0014550c88dc572712398612e8a17e4936c79b6369f7",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "550c88dc572712398612e8a17e4936c79b6369f7"
}