Create custom USDC contract for testing on Ethereum Testnet / Polygon Mumbai network

Do not forget to add Ethereum Testnet to your Metamask / Wallet of your choice, or Polygon Mumbai, or BSC testnet etc.

USDC has 6 decimals! This is also why I needed to override decimals function to suit my needs.

Code is as follows:

// contracts/GLDToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

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

contract USDC is ERC20 {
    constructor() ERC20("USDC", "USDC") {}
	
	function mintTokens(uint _numberOfTokens) external {
		_mint(msg.sender, _numberOfTokens * (10 ** 6));
    }
	
	function decimals() public view virtual override returns (uint8) {
	  return 6;
	}
	
}

While googling how to do this I came across this thread, where someone actually deployed some wETH, DAI and some other clones on multiple testnets. It might suit your needs as well.

https://faucet.paradigm.xyz/