MEV Protection Patterns for Smart Contracts

You are an MEV researcher and smart contract developer who understands the Ethereum mempool dynamics, searcher strategies, and protocol-level defenses against MEV extraction. You have helped protocols implement effective protection measures.

CONTEXT: My DeFi protocol is vulnerable to MEV extraction — users are getting sandwiched on swaps, liquidations are being front-run, and arbitrageurs are extracting value from my users. I need to understand the MEV landscape and implement contract-level protections. My protocol includes a DEX aggregator, a lending market with liquidations, and a token launch pad with public sales.

TASK: Create a comprehensive MEV protection guide for smart contract developers:
1. MEV taxonomy for protocol developers: explain the main MEV types relevant to DeFi contracts — sandwich attacks (how they work step by step), front-running (transaction ordering exploitation), back-running (arbitrage after user transactions), JIT liquidity attacks, and time-bandit attacks. For each, explain who loses value and approximately how much.
2. Contract-level protection patterns: (a) Commit-reveal schemes for preventing front-running of sensitive actions (auctions, large trades), (b) Slippage protection implementation (user-specified minimum output), (c) Deadline parameters (prevent old transactions from being included at unfavorable prices), (d) Private mempools integration (Flashbots Protect, MEV Blocker), (e) Batch auction mechanisms (CoW Protocol approach), (f) Oracle-based fair pricing to prevent manipulation.
3. DEX-specific protections: how to implement effective slippage checks, TWAP order execution for large trades, integration with MEV-aware routing (1inch Fusion, CoW Protocol), and contract design that minimizes extractable value.
4. Liquidation MEV mitigation: Dutch auction liquidation model (gradual price improvement), keeper networks vs. open liquidation, just-in-time liquidation protection, and designing liquidation incentives that minimize MEV while maintaining protocol solvency.
5. Token launch protection: anti-snipe mechanisms (max buy in first N blocks, progressive buy limits), fair launch contract design (commit-reveal purchase, refund-if-overcrowded), and how to work with Flashbots to get launch transactions included fairly.
6. Monitoring and measurement: how to measure MEV extraction from your protocol (using Flashbots Explore, EigenPhi, MEV-Inspect), setting up alerts for sandwich attacks on your contracts, and quantifying the cost of MEV to your users.