simple ETH receiver that automates fees

ETHfeed.sol

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.8.4;

contract ETHfeed {
    uint256 feeRate;

    address feeReceiver;

    constructor(uint256 feeRate_) {
        feeRate = feeRate_;
    }

    receive() external payable {
        deposit();
    }

    function deposit() public payable {
        uint256 fee = msg.value / feeRate;

        _safeTransferETH(feeReceiver, fee);
    }

    /// @dev ETH tranfer helper - optimized in assembly:
    function _safeTransferETH(address to, uint256 amount) internal {
        bool callStatus;

        assembly {
            // transfer the ETH and store if it succeeded or not
            callStatus := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(callStatus, 'ETH_TRANSFER_FAILED');
    }
}