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/nu1qq2m5f8sms20zvmkgh269fmlszkjmfxynh6n786{
"isvalid": true,
"address": "nu1qq2m5f8sms20zvmkgh269fmlszkjmfxynh6n786",
"scriptPubKey": "001402b7449e1b829e266ec8bab454eff015a5b49893",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "02b7449e1b829e266ec8bab454eff015a5b49893"
}