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Crypto
Sandwich Attack
A type of MEV where a bot places one transaction before and one after your trade to profit from the price movement it causes.
Sandwich attacks are common on DEXes with low liquidity. Using slippage protection and trading on higher-liquidity pools or Layer 2s reduces the risk.
Many wallets now warn you about possible sandwich risk before you confirm a swap.
It's like someone cutting in front of you in line and then behind you so they can buy low and sell you the higher price.
Real world: You try to buy a token on Uniswap. A bot sees it, buys first (pushing price up), then sells right after your trade (pushing price down) and pockets the difference.
💡 Always use slippage protection — sandwich attacks are invisible but expensive.