What does the function of limiting the maximum slippage in trading look like on any exchange DEX?

RuslanKhaliapov · May 6, 2023, 5:52pm

What does the function in the smart contract of the token look like that limits the maximum slippage when trading on any DEX exchange, for example, by setting the value to 1%. but the function must not create other vulnerabilities. I need this to prevent the sandwich attack.

CryptoWorld · May 6, 2023, 6:57pm

You can check out uniswap’s v2 router swap functions to see how they implemented it. It’s one of the most used contracts:)

github.com

Uniswap/v2-periphery/blob/master/contracts/UniswapV2Router02.sol

pragma solidity =0.6.6;

import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
import '@uniswap/lib/contracts/libraries/TransferHelper.sol';

import './interfaces/IUniswapV2Router02.sol';
import './libraries/UniswapV2Library.sol';
import './libraries/SafeMath.sol';
import './interfaces/IERC20.sol';
import './interfaces/IWETH.sol';

contract UniswapV2Router02 is IUniswapV2Router02 {
    using SafeMath for uint;

    address public immutable override factory;
    address public immutable override WETH;

    modifier ensure(uint deadline) {
        require(deadline >= block.timestamp, 'UniswapV2Router: EXPIRED');
        _;

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