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/nu1qpu3pvautmcglhvrt39rxthcx0s457wkkel5sck{
"isvalid": true,
"address": "nu1qpu3pvautmcglhvrt39rxthcx0s457wkkel5sck",
"scriptPubKey": "00140f2216778bde11fbb06b894665df067c2b4f3ad6",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "0f2216778bde11fbb06b894665df067c2b4f3ad6"
}