Sending $USDT on Unity

Help - Plug n Play Unity SDK
1

Hi there, my developer trying to send $USDT from one wallet to another on Unity C#.

He uses the following code to send MATIC & it works:

public async Task<string> SendFunds(string toAddress, float amountInUSDT)
    {	
		Account newaccount = UserWalletInfo.Instance.GetAccount(); 
		Web3 NewWeb3 = new Web3(newaccount, Web3Authentication.Instance.GetRpcURL());
		BigInteger amountInWei = Web3.Convert.ToWei(0.1, UnitConversion.EthUnit.Ether);
		var receipt = await NewWeb3.TransactionManager.SendTransactionAsync(newaccount.Address,toAddress, new HexBigInteger(amountInWei));
		Debug.Log(receipt);
		return receipt;
    }

with NewWeb3.Eth
https://polygonscan.com/tx/0x1b4932a51d97c00aa6d4ee5fb9f39e2a9f8402c857b8fe923be0e4814633e73b

only NewWeb3

https://polygonscan.com/tx/0x283fa356640ef33f8551de6ca7ee16899cbea87783842217c1c9e1c1dfc6e655

But $USDT is not a native coin on the Polygon, so we have $USDT contract address(string contractAddress) & ABI file(string contractABI)

He uses the following code:

public async Task<string> SendToken(string toAddress, decimal amountInTokens)
{
    Account senderAccount = UserWalletInfo.Instance.GetAccount();
    Web3 web3 = new Web3(senderAccount, Web3Authentication.Instance.GetRpcURL());

    string contractAddress = GetContractAddress() ;
    string abi = "[{\"inputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"previousOwner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"OwnershipTransferred\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"subtractedValue\",\"type\":\"uint256\"}],\"name\":\"decreaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"addedValue\",\"type\":\"uint256\"}],\"name\":\"increaseAllowance\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"owner\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"renounceOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"amount\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"newOwner\",\"type\":\"address\"}],\"name\":\"transferOwnership\",\"outputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"stateMutability\":\"payable\",\"type\":\"receive\"}]";

    var erc20Contract = web3.Eth.GetContract(abi, contractAddress);
    BigInteger amountInWei = Web3.Convert.ToWei(amountInTokens, UnitConversion.EthUnit.Ether);

    var transferFunction = erc20Contract.GetFunction("transfer");

    string data = transferFunction.GetData(toAddress, amountInWei);
    var transactionInput = new TransactionInput { To = contractAddress, Data = data };
    var transactionHash = await web3.Eth.Transactions.SendTransaction.SendRequestAsync(transactionInput);

    Debug.Log($"Transaction Hash: {transactionHash}");

    return transactionHash;
}```

We have RPCUrl from Infura.

And all of our in-game currency works on the $USDT, but for this use-case, we get the following error:

"RpcResponseException: The method eth_sendTransaction does not exist/is not available: eth_sendTransaction"

Seems like eth_sendTransaction is for a web protocol.

Can you please help us fix that, so it works on our Unity game?

Thanks.
2

@partners Your request has been forwarded to our Dev team and we will get back with further updates.

3

Hi there, thanks for the response.

is there any update on that yet?

4

Hi vjgee,

Can you please check the status from the dev team?

We are expecting this to be solved to launch the game.

Thanks in advance!

5

@partners Thanks for your patience.

Our Dev team informed that this is out of the scope of our SDK. I was able to find some online resource that you can check for the error you get and probably report it there :

6

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