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/nu1qudl45zhp5kjmf8q58f3xg9wxkm5zmwl0mtugca{
"isvalid": true,
"address": "nu1qudl45zhp5kjmf8q58f3xg9wxkm5zmwl0mtugca",
"scriptPubKey": "0014e37f5a0ae1a5a5b49c143a626415c6b6e82dbbef",
"isscript": false,
"iswitness": true,
"witness_version": 0,
"witness_program": "e37f5a0ae1a5a5b49c143a626415c6b6e82dbbef"
}