I can provide you with an article for creating a metamask letter bag in which the OpenSpelin defender relay contract is used to obtain and withdraw USD tokens (ERC-20) with a metamask account.

Creating an intelligent contract with OpenSpelin Defender Relay

In order to use the OpenSpelin defender -Relais, we have to create a new smart contract that can handle gasless transactions. Here is an example of how you can achieve this:

First, let us create a new intelligent contract in solidity, which is used as a relayer for our metamask letter pocket. We call it relaycontract.

`Solidity

Pragma solidity ^0.8.0;

Import “

Import “

Contract relaycontract {

// assignment of the address to your credit

Mapping (address => uint256) public credit;

Function acceptance (Uint256 _AMOUNT, address _Recipient) Public {

require (balances [msg.sender]> = _amount, “inadequate balance”);

request (_amount <= 10 ** 18, "invalid amount");

// Use the OpenSpelin defender to process gasless transactions

Bytes memory data = abi.encodewithsignature (“deductions”, _amount, msg.sender);

// call the relay contract with the data as a function call

(BOOL Success,) = Openzpelindefender.Relay (data);

}

}

`

Next, let’s create a metamask letter pocket that can use this new smart contract. We will also set up OpenSpelin defenders to process gasless transactions.

`Solidity

Pragma solidity ^0.8.0;

Import “

Import “

Contract metamazing pallet {

// assignment of the address to your credit

Mapping (address => uint256) public credit;

// function to add a new account to the wallet

Function ADDACCOUNT (Address _Newaddress, Uint256 _AMOUNT) Public {

Balances [_Newaddress] = _AMOUNT;

}

// Remove the function to remove a account from the wallet

Function Removeccount (address _address) Public {

Balances [_address] = 0;

}

}

`

Now let’s connect our metamask letter bag to the OpenSpelin defender.

`Solidity

Pragma solidity ^0.8.0;

Import “

Import “

Contract defender {

// assignment of the address to your credit

Mapping (address => uint256) public credit;

Function adoccount (address _Newaddress, Uint256 _AMOUNT) Internal {

Balances [_Newaddress] = _AMOUNT;

}

Function Removeaccount (address _address) internal {

Balances [_address] = 0;

}

}

`

Next, let’s create a metamask letter pocket that uses this new smart contract.

`Solidity

Pragma solidity ^0.8.0;

Import “

Import “

Import “