The Dark Side of DEX Aggregators: MEV Bots, Slippage, and How to Protect Your Swaps

MEV bots are automated programs that monitor pending transactions to find chances to profit by reordering or inserting trades around yours. They can front-run or sandwich your trade, causing you to receive fewer tokens and potentially increasing your trading costs.

Slippage is the difference between the expected price of a trade and the actual price at execution. On DEX aggregators, slippage can occur due to rapid price changes or MEV bot activity, leading to less favorable trade outcomes than anticipated.

MEV bots compete to get their transactions included in blocks before or after yours, often by paying higher gas fees. To beat these bots, you may need to increase your own gas fees, which raises your overall transaction costs.

You can set tighter slippage tolerance limits to avoid executing trades at unfavorable prices, use transaction timing to avoid peak network congestion, and employ tools or protocols designed to minimize MEV bot impact. Staying informed about market conditions also helps optimize your trade execution.

While DEX aggregators route trades through multiple liquidity sources to find better prices, MEV bots and slippage can still cause your final execution price to differ. These external factors manipulate trade ordering and market prices quickly, impacting the outcome after the aggregator finds the initial best route.