MEV (Maximal Extractable Value) is the "invisible tax" you pay in DeFi without knowing it. Understanding what it is and how to protect yourself can save you hundreds or thousands of dollars.

What is MEV

MEV is the profit validators and bots can extract by reordering, inserting or excluding transactions within a block. In practice, these are bots exploiting your DeFi transactions.

Types of MEV

1. Sandwich Attack (most common)

When you swap on a DEX:

1. A bot detects your transaction in the mempool
2. Buys before you (frontrun) → pushes price up
3. Your swap executes at the higher price
4. Bot sells immediately (backrun) → takes the difference

Result: you receive fewer tokens than you should.

2. Frontrunning

A bot sees your profitable transaction and copies it with higher gas to execute first.

3. Arbitrage

Bots exploit price differences between DEXs. This MEV type is beneficial as it improves market efficiency.

4. Liquidations

Bots compete to liquidate undercollateralized DeFi loans, earning bonuses.

How Much MEV Costs Users

MEV has extracted billions of dollars from DeFi users since 2020. A typical sandwich attack can cost you 0.5-3% extra per swap.

How to Protect Yourself

1. Use Rabby Wallet

Rabby simulates your transactions and shows exactly what youll receive before signing.

2. Adjust Slippage

Set slippage to the minimum viable (0.5-1%). More slippage = more room for sandwich attacks.

3. Use MEV Protection

• Flashbots Protect (Ethereum): sends your transaction directly to validators, bypassing the public mempool
• MEV Blocker (various wallets integrate it)

4. Use Protected DEXs

• CoW Swap: native MEV protection via batch auctions
• 1inch Fusion: routing that minimizes MEV

5. Trade on L2s or Solana

Arbitrum, Base and Solana have less MEV than Ethereum mainnet due to their architecture.

Jito and MEV on Solana

On Solana, Jito has implemented a system where MEV rewards are redistributed to SOL stakers (jitoSOL). Its a fairer approach: MEV exists, but benefits are shared.

Conclusion

MEV is a DeFi ecosystem reality that wont disappear. The good news is tools exist to protect you. Use wallets with simulation (Rabby), MEV protection (Flashbots) and low slippage. Every percentage point you save in MEV is money directly in your pocket.