DeFi Flash Loan Scanner
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Gescannde Exchanges: Uniswap V3 vs Sushiswap
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const { ethers } = require("ethers");
// 1. VERBINDING: Vul hier uw gratis Sepolia RPC URL in (bijv. van Alchemy of Infura)
const PROVIDER_URL = "HIER_UW_SEPOLIA_RPC_URL";
const provider = new ethers.JsonRpcProvider(PROVIDER_URL);
// 2. VEILIGHEID: Uw private key van een TEST-wallet (gebruik NOOIT uw echte wallet!)
const PRIVATE_KEY = "HIER_UW_TEST_WALLET_PRIVATE_KEY";
const wallet = new ethers.Wallet(PRIVATE_KEY, provider);
// 3. SEPOLIA TESTNET ADRESSEN (Aave V3 & Mock Exchanges)
const FLASH_LOAN_CONTRACT_ADDRESS = "0xHIER_UW_DEPLOYED_TEST_CONTRACT_ADRES";
const MOCK_DEX_A_ROUTER = "0xC532a74256D3Db42D017300c614bA4640a9c5235"; // Sepolia Uniswap V2 Router
const MOCK_DEX_B_ROUTER = "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D"; // Alternatieve Test Router
const USDC = "0x94a9D9Ac8861315e6Acdcfd0c92aFC42A2812976"; // Sepolia Test-USDC (Aave)
const LINK = "0xf8Fb383A922158D6011b9D3Bb7a7b61a8ccd5e40"; // Sepolia Test-LINK (Aave)
// ABIs voor communicatie
const contractAbi = [
"function startFlashLoan(address _tokenAddress, uint256 _amount, bytes calldata _params) external"
];
const flashContract = new ethers.Contract(FLASH_LOAN_CONTRACT_ADDRESS, contractAbi, wallet);
const routerAbi = [
"function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts)"
];
const routerA = new ethers.Contract(MOCK_DEX_A_ROUTER, routerAbi, provider);
const routerB = new ethers.Contract(MOCK_DEX_B_ROUTER, routerAbi, provider);
async function scanTestMarket() {
console.log("[TESTNET] Scannen naar fictieve prijsverschillen op Sepolia...");
// We testen met een fictieve lening van 10.000 Test-USDC
const amountToBorrow = ethers.parseUnits("10000", 6);
try {
// Vraag test-koersen op
const amountsFromA = await routerA.getAmountsOut(amountToBorrow, [USDC, LINK]);
const linkExpected = amountsFromA[1];
const amountsFromB = await routerB.getAmountsOut(linkExpected, [LINK, USDC]);
const usdcFinal = amountsFromB[1];
const aaveFee = amountToBorrow * 9n / 10000n; // 0.09% Aave Fee
const amountToRepay = amountToBorrow + aaveFee;
console.log(`[TEST] Geleend: 10.000 USDC -> Verwachte opbrengst: ${ethers.formatUnits(usdcFinal, 6)} USDC`);
if (usdcFinal > amountToRepay) {
console.log("!!! TESTNET KANS GEVONDEN !!! Test-transactie versturen...");
const params = ethers.AbiCoder.defaultAbiCoder().encode(
["address", "address", "address"],
[MOCK_DEX_A_ROUTER, MOCK_DEX_B_ROUTER, LINK]
);
// Voer de lening gratis uit op het testnet
const tx = await flashContract.startFlashLoan(USDC, amountToBorrow, params, {
gasLimit: 500000
});
console.log(`Test-transactie verzonden! Hash: ${tx.hash}`);
await tx.wait();
console.log("Test-transactie succesvol verwerkt op Sepolia!");
} else {
console.log("Geen winstgevende marge op het testnet momenteel.");
}
} catch (error) {
console.error("Testnet Fout:", error.message);
}
}
// Scan elke 5 seconden
setInterval(scanTestMarket, 5000);
const { ethers } = require("ethers");
// 1. Configuratie & RPC Verbinding (Gebruik bijv. Arbitrum via Infura/Alchemy)
const PROVIDER_URL = "PROV_URL"; // Vul hier uw eigen Web3 RPC Provider URL in
const provider = new ethers.JsonRpcProvider(PROVIDER_URL);
// 2. Uw private sleutel om transacties te ondertekenen (Houd dit strikt geheim!)
const PRIVATE_KEY = "PRIV_KEY";
const wallet = new ethers.Wallet(PRIVATE_KEY, provider);
// 3. Contract adressen (Voorbeeld: Arbitrum netwerk)
const FLASH_LOAN_CONTRACT_ADDRESS = "0xVUL_HIER_UW_DEPLOYED_CONTRACT_ADRES_IN";
const UNISWAP_ROUTER = "0x4752ba5DBc23f44D87826276BF6Fd6b1C372aD24"; // Uniswap V2/V3 Router
const SUSHISWAP_ROUTER = "0x1b02dA8Cb0d097e645729F65f33A788686121274"; // Sushiswap Router
const USDC = "0xaf88d065e77c8cC2239327C5EDb3A432268e5831"; // De munt die we lenen
const LINK = "0xf97f4c5634e999f834ba938444b9164655613da3"; // De munt die we tijdelijk opkopen
// Minimale ABI om functies aan te roepen
const contractAbi = [
"function startFlashLoan(address _tokenAddress, uint256 _amount, bytes calldata _params) external"
];
const flashContract = new ethers.Contract(FLASH_LOAN_CONTRACT_ADDRESS, contractAbi, wallet);
const routerAbi = [
"function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts)"
];
const uniRouter = new ethers.Contract(UNISWAP_ROUTER, routerAbi, provider);
const sushiRouter = new ethers.Contract(SUSHISWAP_ROUTER, routerAbi, provider);
async function scanMarket() {
console.log("Markt scannen naar prijsverschillen...");
const amountToBorrow = ethers.parseUnits("100000", 6); // We willen 100.000 USDC lenen
try {
// Vraag de verwachte opbrengst op bij Uniswap
const uniAmounts = await uniRouter.getAmountsOut(amountToBorrow, [USDC, LINK]);
const linkExpected = uniAmounts[1];
// Vraag de verwachte opbrengst op bij Sushiswap bij directe verkoop
const sushiAmounts = await sushiRouter.getAmountsOut(linkExpected, [LINK, USDC]);
const usdcFinal = sushiAmounts[1];
const aaveFee = amountToBorrow * 9n / 10000n; // 0.09% Aave Fee
const amountToRepay = amountToBorrow + aaveFee;
console.log(`Geleend: 100k USDC -> Opbrengst na rondje langs DEXs: ${ethers.formatUnits(usdcFinal, 6)} USDC`);
// Controleer of de eindbalans hoger is dan de lening + fee + geschatte netwerkkosten
if (usdcFinal > (amountToRepay + ethers.parseUnits("50", 6))) {
console.log("!!! WINSTGEVENDE KANS GEVONDEN !!! Transactie wordt verzonden...");
// Codeer de parameters voor het Smart Contract
const params = ethers.AbiCoder.defaultAbiCoder().encode(
["address", "address", "address"],
[UNISWAP_ROUTER, SUSHISWAP_ROUTER, LINK]
);
// Voer de Flash Loan uit op de blockchain
const tx = await flashContract.startFlashLoan(USDC, amountToBorrow, params, {
gasLimit: 1000000 // Zorg voor voldoende gas
});
console.log(`Transactie verzonden! Hash: ${tx.hash}`);
await tx.wait();
console.log("Transactie succesvol verwerkt op de blockchain.");
} else {
console.log("Geen winstgevende marge op dit moment.");
}
} catch (error) {
console.error("Fout tijdens het scannen:", error.message);
}
}
// Scan elke 5 seconden de markt
setInterval(scanMarket, 5000);
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;
// Minimale interfaces voor Aave V3 en Uniswap/Sushiswap Routers
interface IFlashLoanSimpleReceiver {
function executeOperation(
address asset,
uint256 amount,
uint256 premium,
address initiator,
bytes calldata params
) external returns (bool);
}
interface IPool {
function flashLoanSimple(
address receiverAddress,
address asset,
uint256 amount,
bytes calldata params,
uint16 referralCode
) external;
}
interface IDexRouter {
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
}
interface IERC20 {
function totalSupply() external view uint256;
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
}
contract FlashLoanArbitrage is IFlashLoanSimpleReceiver {
address public owner;
IPool public pool;
modifier onlyOwner() {
require(msg.sender == owner, "Alleen de eigenaar kan dit aanroepen");
_;
}
// Aave V3 Pool adres opgeven bij deployen (bijv. van Arbitrum of Base)
constructor(address _poolAddress) {
owner = msg.sender;
pool = IPool(_poolAddress);
}
// 1. Deze functie start de Flash Loan vanuit uw Node.js script
function startFlashLoan(address _tokenAddress, uint256 _amount, bytes calldata _params) external onlyOwner {
pool.flashLoanSimple(address(this), _tokenAddress, _amount, _params, 0);
}
// 2. Deze functie wordt AUTOMATISCH aangeroepen door Aave ZODRA het geld binnen is
function executeOperation(
address asset,
uint256 amount,
uint256 premium,
address initiator,
bytes calldata params
) external override returns (bool) {
require(msg.sender == address(pool), "Alleen de Aave Pool mag dit uitvoeren");
// Ontrafel de parameters die zijn meegestuurd vanuit Node.js
(address routerA, address routerB, address tokenTarget) = abi.decode(params, (address, address, address));
uint256 amountToRepay = amount + premium;
// --- ARBITRAGE STRATEGIE START ---
// Stap A: Keur Router A goed om onze geleende tokens te gebruiken
IERC20(asset).approve(routerA, amount);
// Stap B: Koop TokenTarget op DEX A (bijv. Uniswap)
address[] memory path1 = new address[](2);
path1[0] = asset;
path1[1] = tokenTarget;
IDexRouter(routerA).swapExactTokensForTokens(
amount,
1, // In productie hier een slip-berekening plaatsen
path1,
address(this),
block.timestamp + 60
);
// Stap C: Verkoop TokenTarget direct op DEX B (bijv. Sushiswap) voor de oorspronkelijke asset
uint256 targetBalance = IERC20(tokenTarget).balanceOf(address(this));
IERC20(tokenTarget).approve(routerB, targetBalance);
address[] memory path2 = new address[](2);
path2[0] = tokenTarget;
path2[1] = asset;
IDexRouter(routerB).swapExactTokensForTokens(
targetBalance,
amountToRepay, // Eis dat we MINIMAAL het terug te betalen bedrag ontvangen
path2,
address(this),
block.timestamp + 60
);
// --- ARBITRAGE STRATEGIE EINDE ---
// Controleer of we genoeg hebben om Aave terug te betalen (+ 0.09% fee)
uint256 finalBalance = IERC20(asset).balanceOf(address(this));
require(finalBalance >= amountToRepay, "Arbitrage mislukt: Te weinig opbrengst om lening te dekken");
// Keur de terugbetaling aan Aave goed
IERC20(asset).approve(address(pool), amountToRepay);
return true;
}
// Winst opnemen uit het contract
function withdrawToken(address _tokenAddress) external onlyOwner {
IERC20 token = IERC20(_tokenAddress);
token.transfer(owner, token.balanceOf(address(this)));
}
}