README.md

Simple Flash Loan Arbitrage Code

This code is based on this tutorial but I use Foundry instead of Hardhat for deployment and testing.

Table of Contents

• Needed Contracts
• Usage
  • Clone this repository
  • Set up .env
  • Deploy
  • Add flashloan and dex into .env
  • Send DAI & USDC to DEX contract
  • Approve
  • Execute the flash loan

Needed Contracts

• Sepolia DAI Contract: 0xFF34B3d4Aee8ddCd6F9AFFFB6Fe49bD371b8a357
• Sepolia USDC Contract: 0x94a9D9AC8a22534E3FaCa9F4e7F2E2cf85d5E4C8

Usage

Clone this repository.

git clone https://github.com/Cyfrin/foundry-nft-f23
cd foundry-nft-f23
forge install
forge build

Set up .env

SEPOLIA_RPC_URL = 
PRIVATE_KEY = 
SEPOLIA_DAI = 
SEPOLIA_USDC = 

Deploy

forge script script/DeployFlashLoan.s.sol:DeployFlashLoan --broadcast --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY

Add flashloan and dex into .env

DEX_CONTRACT = 
FLASHLOAN_CONTRACT = 

Send DAI & USDC to DEX contract

cast send $SEPOLIA_DAI "transfer(address,uint256)(bool)" $DEX_CONTRACT 100000000000000000000 --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY

cast send $SEPOLIA_USDC "transfer(address,uint256)(bool)" $DEX_CONTRACT 100000000 --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY

Approve

cast send $FLASHLOAN_CONTRACT "approveUSDC(uint256)(bool)" 10000000 --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY

cast send $YOUR_FLASHLOAN_CONTRACT "approveDAI(uint256)(bool)" 12000000000000000000 --rpc-url $SEPOLIA_RPC_URL --private-key $YOUR_PRIVATE_KEY

Execute the flash loan

cast send $YOUR_FLASHLOAN_CONTRACT "requestFlashLoan(address,uint256)" $SEPOLIA_USDC_CONTRACT 10000000 --rpc-url $SEPOLIA_RPC_URL --private-key $PRIVATE_KEY