X402_Protocol_USDC.sol
For the full content of this gist, refer to https://gist.github.com/CodingAbdullah/44ad07a4e64828f68cec7d70ba01c1f1
McMaster. Software Engineer with a keen interest in blockchain and web3.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
interface IERC20 {
function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
contract X402Protocol {
IERC20 public usdc;
address public receiver;
uint256 public price;
event PaymentReceived(address indexed user, uint256 amount);
// Initialize the USDC ERC20 contract, receiver address, and USDC value
constructor(address _usdc, address _receiver, uint256 _price) {
require(_usdc != address(0), "Invalid USDC address");
require(_receiver != address(0), "Invalid receiver address");
require(_price > 0, "Price must be greater than zero");
usdc = IERC20(_usdc);
receiver = _receiver;
price = _price;
}
// Function for completing the payment
function pay() external {
bool success = usdc.transferFrom(
msg.sender,
receiver,
price
);
require(success, "USDC transfer failed");
emit PaymentReceived(msg.sender, price);
}
}