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BlockToolsHubCrypto Intelligence
Ethereum8 min read

What is MEV? Sandwich Attacks, Frontrunning, and Flashbots Protection

Understand Maximal Extractable Value: how searchers and block builders extract profit by reordering transactions in the mempool.

Elena Rostova(Cryptographic Systems Researcher)
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Updated 2025-02-28
Executive Summary

Protect your trades from predatory sandwich bots using private RPC endpoints, tight slippage tolerance limits, and MEV-Boost auction knowledge.

1. The Mechanics of a Sandwich Attack

When you place a large market buy order on a decentralized exchange with high slippage tolerance, an automated MEV bot spots your pending transaction in the public mempool.

The bot frontruns you by buying the token first, lets your transaction push the price higher, and immediately backruns by selling at the peak, pocketing risk-free profit at your expense.

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Frequently Asked Questions

Use private RPC endpoints like Flashbots Protect or MEV-Blocker, and always keep your DEX slippage tolerance under 0.5%.