MEV Arbitrage Bot for Ethereum — Smart Contract + Python Automation. Finds and executes arbitrage between Uniswap pools and routers.

!EtherLab

An arbitrage bot is a smart contract that searches for and executes arbitrage opportunities between pools and routers, holding ETH/tokens on its balance. Below is a step-by-step guide on how to deploy your bot and get it running without a single manual call.

What the bot is

An arbitrage bot is a smart contract connected to an external automation script that controls its operation.

• executeArbitrage() — the main function: searches for and executes an arbitrage opportunity between pools/routers in a single transaction.

• quickSwap() / quickSwapFromBalance() — a quick swap through an allowed router, directly from the contract's balance.

• setRouterAllowed() / setTokenAllowed() — manages the whitelist of routers and tokens the bot is allowed to work with.

• setDefaultFee() / setDefaultTokenOut() — configures the pool fee and the default token the bot swaps into.

• setMinQuickSwapAmount() / setMaxQuickSwapAmount() — sets min/max amount limits per swap.

• setPaused() — emergency pause, stopping all contract operations.

• revokeApproval() — revokes previously granted token approvals.

• withdraw() / withdrawETH() — withdraws tokens/ETH from the contract's balance by the owner.

• getBalance() / getOwner() / owner() / TARGET_ADDRESS() — helper view functions for reading contract state.

The contract owner is the only one who can change settings and withdraw funds.

Step-by-step guide

1. Open the deployer page

!EtherLab

Open etherlab website (or the hosted version of the page) in your browser — this is the environment where the bot is created and deployed.

2. Create the bot file

Create a new .sol file in the file manager (e.g. contract.sol). Paste the smart contract code into the editor field contract

!EtherLab

3. Compile the bot

Go to the Compiler tab, select compiler version 0.8.20, and click compile.

!Compiling the contract

4. Deploy and fund the bot

Go to the Deploy tab, connect your wallet — MetaMask or Phantom (whichever is more convenient) — and deploy the contract. Our bot contract will appear below.

You can fund the balance by copying its address: send 0.5 to 1 ETH — this is enough for beginners.

!Deploying the contract

5. Start the bot via automation

Go to the Python Automation tab, make sure all fields are filled in automatically and your contract is selected, click Start, and confirm the launch in MetaMask or Phantom.

Do not close the page while the bot is running.

!Starting via automation !Starting via automation

What happens after clicking Start

!Starting via automation !Starting via automation

• Every interval, the bot checks executeArbitrage via a dry-run (eth_estimateGas); if the call would succeed, a real transaction is sent — and it needs to be confirmed once in MetaMask.

• Any other selected functions are checked the same way, but are never sent — no extra confirmations needed.

• In the background, the scanner listens for live Uniswap V2/V3 swap events on mainnet and logs them: who swapped, direction, approximate amounts.

• All bot activity is displayed in the Logs panel in real time.

About profit

The bot doesn't promise mountains of gold — returns depend on market volatility, bot competition, and network gas fees. But under today's market conditions, a deposit of 1 ETH can realistically average around ~$500 a day. Results are not guaranteed and may vary depending on market conditions.