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Onchain Economics

Sandwich Attack

An MEV extraction technique where an attacker places transactions before and after a victim's trade to profit from the price impact.

In-Depth Explanation

Attacker sees a large pending swap, front-runs it (buying first to raise price), lets the victim's trade execute at a worse price, then back-runs (selling at the inflated price). The victim gets worse execution; the attacker profits. Private mempools and MEV-protection services aim to prevent sandwiching.

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