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MEV
MEV (maximal extractable value) is the profit that can be made by choosing which transactions go into a block and in what order, beyond normal fees and rewards. A common form is the sandwich: someone sees a large pending trade, buys just before it and sells just after.
What it means for you. If your swap is sandwiched, you get a worse price than you expected, up to the slippage limit you set. A wide slippage tolerance on a public pending trade gives more room for this.
Source: ethereum.org: Maximal extractable value · checked 4 October 2026
Slippage
Slippage is the difference between the price you were quoted for a trade and the price you actually get, caused by the market moving while your transaction waits to be confirmed. On a DEX you set a slippage tolerance: the most you will accept.
What it means for you. If the price moves past your tolerance, the swap fails, and on many chains you still pay the network fee. A high tolerance lets the swap go through at a much worse price, and bots can exploit a loose setting. Check the minimum amount you will receive before you confirm.
Source: Uniswap docs: Swaps · checked 4 October 2026