Smart Contract with Mint and Payable Function (ERC20)

Solidity Programming
#1

Hey,

I would like to create smart contract where You can mint new tokens (accesible by anyone calling) and charge a fee during that mint payable to contract creator. Something like a donation, but with the mint new tokens function at the same time.

I came up with something like this (changed onlyOwner to paybale), but how to set I believe msg.value to call a specific amount to pay during the mint. I would appreciate every answer as Im struggling with that for hours now … thank You.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MyToken is ERC20, Ownable {
    constructor() ERC20("MyToken", "MTK") {
        _mint(msg.sender, 10000 * 10 ** decimals());
    }

    function mint(address to, uint256 amount) public payble {
        _mint(to, amount);
    }
}
#2

you can add receiver.transfer(msg.value) after _mint() and define the receiver address somewhere in the contract.

#3

Can You please show the example code. Thank You

#4

In your mint function you can use require.

require(msg.value == amount);
1 Like
#5

Including what glad mentioned, your mint function will look like this, where amount value and receiver address are already defined in the contract.

    function mint(address to, uint256 amount) public payble {
        require(msg.value == amount);
        _mint(to, amount);
        receiver.transfer(msg.value);
    }
1 Like