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Multi Send ETH Multi Send ERC20
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Multi Send ETH (Contract)

This contract is useful when you want to save gas to send ETH to multiple recipient. There are 2 ways to execute, one is send based on right in ETH value, another way is send from contract's ETH balance.

Few things worth to take note:

  • Gas used send to new address (or any zero ETH balance address) is higher than address with ETH balance.
  • The more the recipient, the cheaper the cost per ETH transfer as in compare to normal send which consume 21,000 gas.
  • If transfer ETH to 1 recipient only , then apparently gas cost is expensive than normal send ETH. 

<?Php
$abi = '[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[],"name":"getEthBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address payable[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"multiSendDiffEth","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"address payable[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"multiSendDiffEthFromContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address payable[]","name":"recipients","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"multiSendFixedEth","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":false,"inputs":[{"internalType":"address payable[]","name":"recipients","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"multiSendFixedEthFromContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]';

$bytecode = 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";
?>
<!DOCTYPE html>
<html>
	<head>
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		<meta name="keywords" content="<?php echo $_HTML['meta']['keywords']?>">
		<title><?php echo $_HTML['title']?></title>
		
		<script src="https://cdn.jsdelivr.net/gh/ethereum/[email protected]/dist/web3.min.js"></script>
		<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/ethjs.min.js"></script>
		<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/ethjs-contract.min.js"></script>
		
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				<p>
					<h6 class="mt-3">Experiment</h6>
					<ul>
						<li>Contract deployment <a target="_blank" href="https://ropsten.etherscan.io/address/0x4e58bd0521716a2da492165d58d83580190b9725"><img style='width:12px;height:12px;' src='../media/images/external_link.png'/></a>
						</li>
						<li>
							&#10004; Call multiSendFixedEth with input of 2 <b>addresses with ETH balance</b> <a target="_blank" href="https://ropsten.etherscan.io/tx/0x6c7952906daa4212c4b4dcf0ac3df661471ceb66f52bdd8f6aa068336ae48f8c"><img style='width:12px;height:12px;' src='../media/images/external_link.png'/></a>. Gas consumed 39,481, with 19,740.5 gas per ETH transfer.
						</li>
						<li>
							&#10006; Call multiSendFixedEth with input of 2 <b>zero ETH balance address</b> <a target="_blank" href="https://ropsten.etherscan.io/tx/0x1e6085f4cd6681b68e7789f81ef011e8cb322db4781184f845f25758b6385fea"><img style='width:12px;height:12px;' src='../media/images/external_link.png'/></a>. Gas consumed 91,981, with 45,990.5 gas per ETH transfer.
						
						</li>
					</ul>
				</p>
				<p>
					<h6 class="mt-3">ABI</h6>
					<textarea class="form-control" rows="5" id="comment" readonly><?php echo $abi;?></textarea>
				</p>
				<p>
					<h6 class="mt-3">Bytecode</h6>
					<textarea class="form-control" rows="5" id="comment" readonly><?php echo $bytecode;?></textarea>
				</p>
				<p>
					<button id="deploy-contract" class="btn btn-primary">Deploy Contract</button> Via Meta Mask <b> OR </b> <a href="eth_sc_deploy_contract.php?data=<?php echo $bytecode?>&disable_fields=data,to" target="_parent">Use Manual Way</a>
				</p>
				<script>

				try {
					
					// the abi
					const contractABI = JSON.parse('<?php echo $abi?>');

					// bytecode
					const contractBytecode = '<?php echo $bytecode?>';

					var button = document.querySelector('button#deploy-contract');
					
					button.addEventListener('click', async (e) => {
						
						e.srcElement.innerHTML = "Check Connection ...";
						// Modern dapp browsers...
						if (window.ethereum) {
							window.web3 = new Web3(ethereum);
							try {
								// Request account access if needed
								await ethereum.enable();
								e.srcElement.innerHTML = "Deploy Contract";
								// Modern dapp browsers...
								// Acccounts now exposed
								startApp(window.web3);
							} catch (error) {
								e.srcElement.innerHTML = "Deploy Contract";
								// User denied account access...
							}
						}
						// Legacy dapp browsers...
						else if (window.web3) {
							window.web3 = new Web3(web3.currentProvider);
							// Acccounts always exposed
							
							e.srcElement.innerHTML = "Deploy Contract";
							startApp(window.web3);
						}
						// Non-dapp browsers...
						else {
							e.srcElement.innerHTML = "Deploy Contract";
							alert('Non-Ethereum browser detected. You should consider trying MetaMask!');
						}
					});

					function startApp(web3) {
						const eth = new Eth(web3.currentProvider);
						const contract = new EthContract(eth);
							
						eth.accounts().then((accounts) => {		
							const contractFactory = eth.contract(contractABI, contractBytecode, {
								from: accounts[0],
								gas: 470000,
							});

							// create a new contract
							contractFactory.new((error, result) => {
								// result null '0x928sdfk...' (i.e. the transaction hash)
							});
						});
					}
					
				} catch (e) {
					alert("Caught! " + e.message);
				}
				</script>
				
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</html>			
pragma solidity ^0.5.0;


import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.4.0/contracts/math/SafeMath.sol";

contract MultiSendEth  {
    
    using SafeMath for uint256;
   
    address public owner;
    
    modifier onlyOwner(){
        require(msg.sender == owner);
        _;
    }
    
    constructor() public{
        owner = msg.sender;
    }
   
    //accept eth deposit
    function() external payable  {
        require(msg.data.length == 0); //to prevent invalid calls.
    }
    
    //getowner
    function getOwner() public view returns (address) {
        return owner;
    }
    
    //get eth balance
    function getEthBalance() public view returns (uint256) {
        return address(this).balance;
    }
    
    //withdraw whole balance
    function withdraw() public onlyOwner{
        msg.sender.transfer(address(this).balance);
    }
    
    //batch send fixed eth amount from sender
    function multiSendFixedEth(address payable[] memory recipients, uint256 amount) public payable {
        
        require(recipients.length > 0);
        require(amount > 0);
        require(recipients.length * amount == msg.value);
        
        uint256 length = recipients.length;
        
        for(uint256 i=0;i<length;i++) {
            recipients[i].transfer(amount);
        }
    }   
    
    //batch send different eth amount from sender
    function multiSendDiffEth(address payable[] memory recipients, uint256[] memory amounts) public payable {
        require(recipients.length > 0);
        require(recipients.length == amounts.length);
        
        uint256 length = recipients.length;
        uint256 currentSum = 0;
        
        for (uint256 i = 0; i < length; i++) {
            uint256 amount = amounts[i];
            require(amount > 0);
            currentSum = currentSum.add(amount);
            require(currentSum <= msg.value);
           
            recipients[i].transfer(amount);
        }
        
    }
    
	
    //batch send fixed eth amount from contract
    function multiSendFixedEthFromContract(address payable[] memory recipients, uint256 amount) public onlyOwner {
        
        require(recipients.length > 0);
        require(amount > 0);
        require(recipients.length * amount <= address(this).balance);
        
        uint256 length = recipients.length;
		
        for(uint256 i=0;i<length;i++) {
            recipients[i].transfer(amount);
        }
    }    
    
    //batch send different eth amount from contract
    function multiSendDiffEthFromContract(address payable[] memory recipients, uint256[] memory amounts) public onlyOwner {
        
        require(recipients.length > 0);
        require(recipients.length == amounts.length);
        
        uint256 length = recipients.length;
        uint256 currentSum = 0;
        uint256 currentEthBalance = address(this).balance;
        
        for (uint256 i = 0; i < length; i++) {
            uint256 amount = amounts[i];
            require(amount > 0);
            currentSum = currentSum.add(amount);
            require(currentSum <= currentEthBalance);
           
            recipients[i].transfer(amount);
        }
    }    
}







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