FlashLoan-Arbitrage-Bot_multi-Arbitrage

---

📌 FlashLoan Arbitrage Bot

This is a Solidity smart contract that implements a configurable arbitrage strategy using Aave V3 Flash Loans and swaps through Uniswap V3 and PancakeSwap V2 & V3 liquidity pools. The goal is to borrow a token with no upfront capital, perform multi-hop swaps between DEXs, capture price inefficiencies, and repay the loan in the same transaction, pocketing the profit.

---

🚀 Features

✅ Aave V3 Flash Loans — Borrow tokens instantly without collateral.

✅ Supports multiple swap paths — Uniswap V3 ➜ Pancake V2, Pancake V3 ➜ Pancake V2, V2 ➜ V3, V3 ➜ V3, V2 ➜ V2.

✅ Configurable routers — Easily update router addresses for Uniswap and PancakeSwap.

✅ Owner withdraw & balance check — Recover stuck funds and check balances safely.

✅ Fully on-chain arbitrage loop — All operations (loan, swaps, repayment) happen atomically.

---

⚙️ Architecture

Contracts Used:

• FlashLoanSimpleReceiverBase — Aave’s base for flash loan receivers.
• ISwapRouter — For Uniswap V3 swaps.
• IPancakeRouter02 — For PancakeSwap V2 swaps.

Workflow:

1. Request a flash loan for a token (token1).
2. Perform one or more swaps across Uniswap V3 & PancakeSwap to exploit price differences.
3. Repay Aave with premium in the same transaction.
4. If profit remains, send it to the contract owner.

---

🔑 Main Variables

Name	Purpose
token1	The borrowed asset
token2	The intermediate swap token
fee1, fee2	Uniswap V3 fee tiers (e.g., 500, 3000)
uniswapRouter3	Uniswap V3 router address
pancake2	PancakeSwap V2 router address
pancake3	PancakeSwap V3 router address
OutMin3	Minimum output for swaps to protect against slippage
time	Swap deadline buffer
owner	Contract owner

---

⚡️ Supported Swap Modes

The arbitrage logic supports multiple swap modes, passed via the mode parameter:

Mode	Route
1	Uniswap V3 ➜ Pancake V3
2	Uniswap V3 ➜ Uniswap V3
3	Pancake V3 ➜ Uniswap V3
4	Pancake V3 ➜ Pancake V3
5	Pancake V3 ➜ Pancake V2
6	Pancake V2 ➜ Pancake V3
7	Pancake V2 ➜ Pancake V2
8	Uniswap V3 ➜ Pancake V2
9	Pancake V2 ➜ Uniswap V3

---

📜 Main Functions

📍 Flash Loan

fn_RequestFlashLoan(address _token1, address _token2, uint256 _amount, uint24 _fee1, uint24 _fee2, uint8 _mode)

• Starts the flash loan and arbitrage process.

📍 Core Execution

executeOperation(...)

• Callback function called by Aave after lending. Handles all swaps & repayment.

---

🔄 Internal Swap Helpers

• swap_v3_v3(): Swap between Uniswap V3 / Pancake V3 pools.
• swap_v3_v2(): Uniswap/Pancake V3 ➜ Pancake V2.
• swap_v2_v3(): Pancake V2 ➜ Uniswap/Pancake V3.
• swap_v2_v2(): Pancake V2 ➜ Pancake V2.

---

🔐 Owner-Only Functions

• withdraw(address _tokenAddress): Withdraw any ERC20 stuck in contract.
• withdra_networktoken(uint256 _amount, address payable _to): Withdraw native chain tokens (BNB, ETH).
• getBalance(address _token): Check ERC20 balance.
• getBalance_networktoken(): Check native token balance.
• C_OutMin3(), C_uniswapRouter3(), C_pancake2(), C_pancake3(), C_aave(): Update contract configuration.

---

⚠️ Security & Warnings

• Highly risky — Arbitrage relies on rapid execution and precise liquidity.
• Reentrancy protection — This version does not implement reentrancy guards. Consider adding ReentrancyGuard from OpenZeppelin.
• Slippage — Always set OutMin3 carefully to prevent sandwich attacks.
• Test thoroughly — Run tests with mainnet fork and simulate realistic pool conditions.
• MEV — Front-running risk exists; use private mempool or Flashbots.

---

✅ Deployment Example

constructor(address _AAVE) 
  FlashLoanSimpleReceiverBase(IPoolAddressesProvider(_AAVE)) { 
  owner = payable(msg.sender);
  ...
}

• Pass Aave PoolAddressesProvider address for your chain.
• Update router addresses for your target DEXes.

---

🛡️ Requirements

• Solidity ^0.8.10
• Aave V3 deployed on your network
• Uniswap V3 and PancakeSwap routers on target network
• Sufficient liquidity for the arbitrage pair

---

⚡️ Example Use

fn_RequestFlashLoan(
  0x...WETH,
  0x...USDC,
  10 ether,
  500,   // fee1 for Uniswap V3
  3000,  // fee2 for Pancake V3
  1      // Mode: Uniswap V3 ➜ Pancake V3
);

---

📚 Disclaimer

This contract is for educational & research purposes. Use at your own risk. Improper use may cause loss of funds.