Ethereum Arbitrage Bot: A Practical, Sceptical Guide

An Ethereum arbitrage bot is software that watches the same asset on several venues, spots a price difference and trades both sides before the gap closes. On Ethereum those venues are mostly decentralised exchanges such as Uniswap, Sushiswap, Curve and Balancer, and the trades are ordinary on-chain transactions. The bot’s job is not to predict markets. It is to find a gap, work out whether it survives gas fees and fees charged by the pools, and send the transaction quickly and privately.

That last sentence is where most beginners lose money. A price gap of half a percent looks attractive until you subtract two pool fees, slippage and the gas cost of a multi-step swap. A bot is only useful if it does that arithmetic before sending, simulates the result and refuses to trade when the numbers are thin. If you want the groundwork first, start with what Ethereum arbitrage actually is and the step-by-step explanation of how DEX arbitrage works.

On the product side, CryptoMEV Bot’s Ethereum arbitrage bot page describes a non-custodial tool that scans Uniswap (V2 and V3), Sushiswap, Curve and Balancer, simulates trades, calculates profit after gas and sends transactions through Flashbots. It lists a one-time Retail Trader price of $1,999 and an Enterprise tier starting at $50,000. Those are the vendor’s own statements, and the page does not publish performance data, so treat it as a description of a product rather than evidence of results. The same vendor also documents a separate flash loan arbitrage bot for strategies that borrow capital inside a single transaction.

This site is organised around the questions a careful buyer or builder asks.

• Is it worth doing? Read whether Ethereum arbitrage is still profitable and the worked example in gas fees and arbitrage profit.
• How do bots avoid being copied? See Flashbots Protect and private transactions and the comparison of an MEV bot and an arbitrage bot.
• Do I need capital? Flash loan arbitrage is the usual answer, with caveats.
• Buy or build? Compare the routes in build or buy an arbitrage bot and use the selection checklist.
• What can go wrong? Start with the main risks and the legal and tax overview.

A few principles run through all of it. Arbitrage is competitive, and the easy gaps are usually taken by faster, better-funded searchers. Published feature lists are not profit. Backtests and dashboards are not guarantees. Smart contracts and bot software can have bugs, and a failed or reverted transaction still costs gas. CryptoMEV Bot’s own disclaimer says trading is risky, results are hypothetical and users must monitor their own activity, which is a fair summary of the whole field.

We are independent. Where we mention a product we say what it states, what it does not state and who it might suit. Nothing here is financial, tax or legal advice, and fees, protocols and rules change, so verify current details at the source.