What is MEV?
Maximal Extractable Value (MEV) is the value that block producers (miners under PoW, validators under PoS) can extract from a block by including, excluding, or reordering transactions in a way that benefits them — beyond standard block rewards and transaction fees. MEV emerges because of the discretion block producers have over transaction ordering, and is most pronounced in DeFi where atomic arbitrage and liquidation opportunities create extractable rents.
Common MEV strategies
- Arbitrage: price differences across DEXs captured by atomic same-block swaps.
- Liquidations: earning liquidation bonus on undercollateralised lending positions (Aave, Compound).
- Sandwich attacks: placing a buy before a victim’s swap and a sell after, profiting from induced slippage.
- Frontrunning: seeing pending transactions in the mempool and racing ahead with a higher gas bid.
- Backrunning: placing a transaction immediately after a target to capture state changes (often benign, e.g., arbitrage normalising post-trade prices).
MEV mitigation — Flashbots and proposer-builder separation (PBS)
Flashbots and MEV-Boost introduced private orderflow channels where users submit bundles to block builders without exposing them to public mempool frontrunning. Ethereum’s Proposer-Builder Separation roadmap formalises this: validators delegate block-building to specialised builders via competitive auctions, distributing MEV more efficiently and reducing centralisation pressure.
Türk DEX kullanıcısı için
Türk DEX kullanıcıları (özellikle yüksek-hacimli swap yapanlar) sandwich saldırıları ve negatif MEV maruziyetinden korunmak için MEV-aware router’lar (CoW Swap, 1inch Fusion) tercih etmelidir. Slippage tolerance %1’in altında tutulmalı; yüksek-değerli işlemler özel orderflow (Flashbots Protect, MEV-Blocker) üzerinden gönderilmeli. Bu pratikler Türk hukuk düzenlemesi dışında ancak kullanıcı koruma için kritik.
Do: use MEV-protected RPC endpoints; set tight slippage tolerances; consider CoW Swap for large trades.
Don’t: assume public mempool transactions are private — they are visible to MEV searchers and bots within seconds.