An Ethereum smart contract which transfers many different ERC20 tokens and ETH in one transaction

MultiTransfer.sol

pragma solidity >=0.4.21 <0.7.0;
pragma experimental ABIEncoderV2;

import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";

contract MultiTransfer {
    struct Destination {
        address token;
        uint256 amount;
        address payable receiver;
    }

    function() external payable {}

    function send(Destination[] memory destinations) public payable returns (bool success) {
        for (uint256 x = 0; x < destinations.length; x++) {
            Destination memory dst = destinations[x];
            if (dst.token == 0x000000000000000000000000000000000000bEEF) {
                // Eth transfer
                dst.receiver.transfer(dst.amount);
            } else {
                ERC20 erc20_contract = ERC20(dst.token);
                assert (erc20_contract.transferFrom(msg.sender, dst.receiver, dst.amount));
            }
        }
        return true;
    }
}