[Java] How do I query the balance of an ERC20 Contract?

Using the Casper Java SDK, you can query an ERC-20 contract for an account’s balance quickly and easily:

import com.casper.sdk.CasperSdk;
import com.casper.sdk.HttpService;
import com.casper.sdk.types.*;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        
        // Initialize a new Casper SDK client instance with the node URL.
        String nodeUrl = "http://localhost:11101";
        CasperSdk client = new CasperSdk(new HttpService(nodeUrl));

        // Define the contract hash and account address.
        String contractHash = "hash0123456789abcdef";
        String accountAddress = "account-hash0123456789abcdef";
        
        // Define the function arguments as a Map.
        Map<String, CLValue> argsMap = new HashMap<String, CLValue>();
        argsMap.put("address", new CLValue(new AccountHash(accountAddress)));

        // Build the contract call transaction.
        DeployParams params = new DeployParams(new AccountHash(client.getSigner().getAccountHash()),
                                                new Nonce(1),
                                                new BigInteger("1000000000"),
                                                new GasLimit(1000000000),
                                                new ContractHash(contractHash),
                                                new FunctionCallParams("balance_of", new RuntimeArgs(argsMap)));
        Deploy deploy = new Deploy(client.getSigner(), params);

        // Send the transaction and get the result.
        String result = client.sendDeploy(deploy);

        // Save the result to a key in local storage.
        // Here, we're just printing it to the console for demonstration purposes.
        System.out.println("Result: " + result);
    }
}

If you have any concerns, questions, or issues, please submit a request to our support team here: https://support.casperlabs.io/hc/en-gb/requests/new .