You need get an address to verify the addressBalance
First Get Address
String address = await walletUser.getAddress(); // To Get an Address from wallet
Saldos de tokens específicos:
String balanceAddress = await walletUser.address(address).balance(); // To get balance from address
print(balanceAddress); // "0"
String balanceAddressTokenX = await walletUser.address(address).balance(tokenX); // To get balance of the token from address
print(balanceAddressTokenX); // "0"