LendingPool

Welcome to the LendingPool challenge! In this challenge, you'll be diving into a pool that offers flash loans of CTF tokens for free. The pool currently holds a balance of 1 million CTF tokens, while you start with nothing. However, there's no need to worry – you just might have what it takes to acquire them all from the pool. LendingPool

// SPDX-License-Identifier: MIT pragma solidity ^0.8.0;

import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract LendingPool is ReentrancyGuard { IERC20 public ctfToken;

constructor(address tokenAddress) { ctfToken = IERC20(tokenAddress); }

function flashLoan(uint256 borrowAmount, address borrower, address target, bytes calldata data) external nonReentrant { uint256 balanceBefore = ctfToken.balanceOf(address(this)); require(balanceBefore >= borrowAmount, "Not enough tokens in pool");

ctfToken.transfer(borrower, borrowAmount);
(bool success,) = target.call(data);
require(success, "External call failed");


uint256 balanceAfter = ctfToken.balanceOf(address(this));
require(balanceAfter >= balanceBefore, "Flash loan hasn't been paid back");

}

function isSolved() public view returns (bool) { return ctfToken.balanceOf(address(this)) == 0; } }

CTF Token

https://mumbai.polygonscan.com/address/0xfa8994aa87c97e291dc8f08d88d76a1c623474d7

Note: To participate in this challenge, please ensure you possess Mumbai Testnet Matic tokens. https://mumbaifaucet.com/

The website is available at: https://lending.uctf.ir/