Smart Contract (SC)
Development Tools
Useful Contracts
Security
Multi Send ERC20 (Contract)
This contract is useful when you want to save gas to send ERC20 token to multiple recipient. It works to send from contract's token balance, so make sure you have deposit enough token into contract.
Few things worth to take note:
- Gas used to deposit contract with token balance is cheaper than zero token balance contract.
-
Gas consumption for normal send ERC20 using transfer() method.
- Send to has balance address, gas consume about ~36,163
.
- Send to zero balance address, gas consume about ~51,163.
<?Php
$abi = '[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"getTokenBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"multiSendDiffToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"multiSendDiffTokenFromContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"multiSendFixedToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"address[]","name":"recipients","type":"address[]"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"multiSendFixedTokenFromContract","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":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]';
$bytecode = "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?>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="">
<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>
<!-- Bootstrap core CSS -->
<link href="../media/vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="../media/vendor/enlighter/css/enlighterjs.min.css?<?php echo time()?>" rel="stylesheet">
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<link href="../media/css/simple-sidebar.css?<?php echo time()?>" rel="stylesheet">
<!-- Bootstrap core JavaScript -->
<script src="../media/vendor/jquery/jquery.min.js"></script>
</head>
<body>
<div class="d-flex" id="wrapper">
<!-- Page Content -->
<div id="page-content-wrapper" >
<p>
<h6 class="mt-3">Experiment</h6>
<ul>
<li>Contract deployment <a target="_blank" href="https://ropsten.etherscan.io/address/0x2273784639770fbf67908c3ecd460f3b14fbec84"><img style='width:12px;height:12px;' src='../media/images/external_link.png'/></a>.
</li>
<li>
✔ Call multiSendFixedToken with input of 2 <b>addresses with token balance</b> <a target="_blank" href="https://ropsten.etherscan.io/tx/0xc252c2eb6ed670c92a0d165642abc17ec60bc2b7e29eff8a192690ed0c703839"><img style='width:12px;height:12px;' src='../media/images/external_link.png'/></a>
. Gas consumed 43,208, with 21,604 gas per token transfer.
</li>
<li>
✖ Call multiSendFixedToken with input of 2 <b>zero token balance addresses</b> <a target="_blank" href="https://ropsten.etherscan.io/tx/0xb24e53d750fa2c94c261d44a83b12d5fa53511b844d5436eed6b9002b5b4e3f7"><img style='width:12px;height:12px;' src='../media/images/external_link.png'/></a>. Gas consumed 82,208, with 41,104 gas per token transfer.
</li>
</ul>
Please be noted that use of multiSendFixedToken requires approval of contract as spender
</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>
</div>
<!-- /#page-content-wrapper -->
</div>
<!-- /#wrapper -->
</body>
<script src="../media/vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
<script src="../media/vendor/enlighter/js/enlighterjs.min.js"></script>
<!-- Menu Toggle Script -->
<script type="text/javascript">
$("#menu-toggle").click(function(e) {
e.preventDefault();
$("#wrapper").toggleClass("toggled");
});
// - highlight all pre + code tags (CSS3 selectors)
// - use javascript as default language
// - use theme "enlighter" as default theme
// - replace tabs with 2 spaces
EnlighterJS.init('pre', 'code', {
language : 'php',
theme: 'enlighter',
indent : 4
});
$(document).ready(function(){
$('[data-toggle="tooltip"]').tooltip();
});
</script>
<script type="text/javascript" src="../media/vendor/iframeresizer/js/iframeResizer.contentWindow.min.js"></script>
</html>
pragma solidity ^0.5.0;
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.4.0/contracts/token/ERC20/IERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.4.0/contracts/token/ERC20/SafeERC20.sol";
contract BatchSendERC20 {
using SafeMath for uint256;
using SafeERC20 for IERC20;
address public owner;
modifier onlyOwner(){
require(msg.sender == owner);
_;
}
constructor() public{
owner = msg.sender;
}
//getowner
function getOwner() public view returns (address) {
return owner;
}
//get token balance
function getTokenBalance(IERC20 token) public view returns (uint256) {
return token.balanceOf(address(this));
}
//withdraw whole erc20 token balance
function withdraw(IERC20 token) public onlyOwner{
token.safeTransfer(msg.sender, token.balanceOf(address(this)));
}
//batch send fixed token amount from sender, require approval of contract as spender
function multiSendFixedToken(IERC20 token, address[] memory recipients, uint256 amount) public {
address from = msg.sender;
require(recipients.length > 0);
require(amount > 0);
require(recipients.length * amount <= token.allowance(from, address(this)));
for (uint256 i = 0; i < recipients.length; i++) {
token.safeTransferFrom(from, recipients[i], amount);
}
}
//batch send different token amount from sender, require approval of contract as spender
function multiSendDiffToken(IERC20 token, address[] memory recipients, uint256[] memory amounts) public {
require(recipients.length > 0);
require(recipients.length == amounts.length);
address from = msg.sender;
uint256 allowance = token.allowance(from, address(this));
uint256 currentSum = 0;
for (uint256 i = 0; i < recipients.length; i++) {
uint256 amount = amounts[i];
require(amount > 0);
currentSum = currentSum.add(amount);
require(currentSum <= allowance);
token.safeTransferFrom(from, recipients[i], amount);
}
}
//batch send fixed token amount from contract
function multiSendFixedTokenFromContract(IERC20 token, address[] memory recipients, uint256 amount) public onlyOwner {
require(recipients.length > 0);
require(amount > 0);
require(recipients.length * amount <= token.balanceOf(address(this)));
for (uint256 i = 0; i < recipients.length; i++) {
token.safeTransfer(recipients[i], amount);
}
}
//batch send different token amount from contract
function multiSendDiffTokenFromContract(IERC20 token, address[] memory recipients, uint256[] memory amounts) public onlyOwner {
require(recipients.length > 0);
require(recipients.length == amounts.length);
uint256 length = recipients.length;
uint256 currentSum = 0;
uint256 currentTokenBalance = token.balanceOf(address(this));
for (uint256 i = 0; i < length; i++) {
uint256 amount = amounts[i];
require(amount > 0);
currentSum = currentSum.add(amount);
require(currentSum <= currentTokenBalance);
token.safeTransfer(recipients[i], amount);
}
}
}
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