In this video, we're building an on-chain MEV detection contract in Solidity that catches the three most common attack patterns: sandwich attacks, front-running, and same-block manipulation. If you've ever lost money to a sandwich bot or watched a transaction get front-run, this one's for you.
MEV extraction costs DeFi users hundreds of millions of dollars every year. While true protection ultimately comes from architecture (commit-reveal, batch auctions, private mempools), there's a lot we can do directly in the contract to detect suspicious patterns and reject them before damage is done. We'll build a defense-in-depth layer that integrators can drop into their own protocols.
What you'll walk away with:
A complete MEVDetector contract under 250 lines of Solidity
Sandwich attack detection using bookend pattern matching
Front-run detection via priority fee analysis using tx.gasprice and block.basefee
Same-block reentry guards to block fast follow-up transactions
Intra-block price drift detection for pool manipulation
A bitfield flag system to track suspicious behavior per address
Stackable modifiers other contracts can adopt for protection
A view-only analyzeTx function bots can use off-chain to score MEV exposure
We'll also cover the limitations honestly. Sophisticated searchers split across multiple addresses, use private builders like Flashbots where tx.gasprice can be zero, and can route around naive detection. This contract is a useful layer, not a silver bullet, and we'll talk about when to reach for stronger protections.
This tutorial assumes you're comfortable with intermediate Solidity and have a basic understanding of how MEV works. By the end, you'll know how to build defensive contracts and understand the tradeoffs of every approach.
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