Crypto MEV Bot 2026: Deploy an Ethereum MEV Bot From One Browser Tab — 0.4 ETH Minimum, Full Walkthrough

Most MEV tooling assumes you already live in a terminal. This one assumes you have a browser. You open an IDE, create one file, paste the source, hit compile, connect MetaMask, and deploy the contract to Ethereum mainnet — and the bot starts hunting spreads while you watch. The whole thing is on camera, start to finish, with no cuts and no unverifiable screenshots.

What the bot actually does

The thesis is mempool arbitrage. The smart contract lets the bot read stablecoin mempools and spot temporary gaps between prices across venues. When the measured gap still leaves profit after gas, the bot executes the trade itself instead of waiting for a fill. That price difference becomes arbitrage profit, and it accrues continuously rather than in bursts.

Because the network is Ethereum, gas moves fast — and that volatility is exactly where the mempool offers opportunities. A busy chain changes the fee floor minute to minute, and each change temporarily misprices a swap somewhere.

Deploying it — no local setup

The build runs from ide.basefarmr.xyz, a browser IDE with the dependencies already in place. The sequence is short:

Create a new file and give it a single-word name, then paste the open-source code from the guide. Hit compile and build under the compile tab and wait for the successful build. Go to the deploy tab, connect your wallet from the top right, and click secure deploy. The Etherscan link is the proof: the contract is live on Ethereum mainnet and the owner listed is your own address.

Deployment is cheap by modern standards — a contract on the network generally runs around fifty cents.

What it costs to start

A deployed contract still needs trading liquidity before it can do anything. Copy the contract address and deposit ETH through your wallet, then confirm with the update balance function.

The minimum that clears the spread is 0.4 ETH. Below that the gap between transactions is too thin to survive gas and the bot has nothing to work with. Bigger deposits carry proportionally more profit potential, because each one adds room to capture the spread between two transactions.

Then you hit start. Initialization takes about ten seconds, and trades begin appearing on screen while the bot keeps scanning the mempool in real time.

Getting your money back out

The withdraw button is also the stop button — the bot cannot be running while liquidity is being pulled, so the platform handles the shutdown first and returns the liquidity and the profit to your own wallet. That step can take up to thirty seconds.

That is the entire loop: deploy, fund, run, stop, withdraw. Everything sits in your own wallet and your own contract.

Watch it run

The full walkthrough covers the setup, a live trading test and the day-trading results, with timestamps for each section. If you would rather watch the mechanism before you touch a wallet, start there.

The bot is listed in the earncrypto.dev directory under SCRIPTS, together with the rest of the MEV and arbitrage tooling.