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I made a $10,000 trade on a certain DEX, the transaction was confirmed, and when I opened my wallet—what's going on, I lost 1.8%?
It must be price slippage, right?
Wrong! Completely wrong!!
Check your transaction history on the block explorer. You'll find an interesting phenomenon: there is a transaction before and after yours. The one before? Front-run by a bot. The one after? Also a bot.
Your order was sandwich attacked. This is what’s called MEV—Miner Extractable Value. Bots observe the mempool, buy in front of your transaction to push up the price, then your large trade drives the price higher, and finally, they sell after your transaction completes to profit.
That 1.8% you lost was just eaten up by bots. This is what really happened.