Metamask: How to create a smart contract using OpenZeppelin MetaTx relayer to receive and withdraw USDT ERC20 tokens using Metamask?

I can provide you with an article on how to create a Metamask wallet that uses the OpenZeppelin Defender Relay contract to receive and withdraw USD tokens (ERC-20) using a MetaMask account.

Creating a Smart Contract with OpenZeppelin Defender Relay

To use the OpenZeppelin Defender Relay, we will need to create a new smart contract that can handle gas-free transactions. Here is an example of how you can achieve this:

First, create a new smart contract in Solidity that will be used as a relay for our MetaMask wallet. Let’s call it « RelayContract ».

pragma strength ^ 0,8,0;
import "
import "
contract RelayContract {
// Mapping addresses to their balances
mapping (address => uint256) public balances;
function drawToken(uint256 _amount, address _recipient) public {
require(balances[msg.sender] >= _amount, "Insufficient balance");
require(_amount <= 10**18, "Invalid amount");
// Use OpenZeppelin Defender to handle gas-free transactions
bytes memory data = abi.encodeWithSignature("drawToken", _amount, msg.sender);
// Call the relay contract with the data as a function call
(bool success, ) = openzeppelinDefender.relay(data);
}
}

Next, create a MetaMask wallet that can use this new smart contract. We will also configure OpenZeppelin Defender to handle gas-free transactions.

pragma strength ^ 0,8,0;
import "
import "
contract MetaMaskWallet {
// Mapping addresses to their balances
mapping (address => uint256) public balances;
// Function to add a new account to the wallet
function addAccount(address _newAddress, uint256 _amount) public {
balances[_newAddress] = _amount;
}
// Function to remove an account from the wallet
function removeAccount(address _address) public {
balances[_address] = 0;
}
}

Now let’s connect our MetaMask wallet with OpenZeppelin Defender.

pragma strength ^ 0,8,0;
import "
import "
contract Defender {
// Assign addresses to their balances
mapping (address => uint256) public balances;
function addAccount(address _newAddress, uint256 _amount) internal {
balances[_newAddress] = _amount;
}
function removeAccount(address _address) internal {
balances[_address] = 0;
}
}

Next, create a MetaMask wallet that uses this new smart contract.

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pragma strength ^ 0,8,0;

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