skill-15-mev-protection

MEV Protection

When to Use

• Executing swaps > $1,000 on public mempools
• Protecting against sandwich attacks
• Submitting liquidation transactions
• Implementing TWAP/VWAP execution strategies
• Using intent-based protocols (CoW Swap, UniswapX)

Prerequisites

• MCP: blockchain-rpc-server, price-feed-server
• Skill-12 for private tx submission

MEV Attack Vectors

Attack	Mechanism	Mitigation
Sandwich	Front-run buy + back-run sell	Private mempool, slippage limits
Frontrunning	Copy profitable tx with higher gas	Flashbots bundle, commit-reveal
Backrunning	Arbitrage after your tx	Accept (usually harmless)
JIT Liquidity	Temporary LP around your swap	TWAP, smaller chunks

Workflow

1. Private Transaction Submission

Ethereum (Flashbots Protect):

RPC: https://rpc.flashbots.net

• No revert protection by default — add X-Flashbots-Signature for bundles
• Transactions not visible in public mempool

MEV-Share: Share MEV refund with searchers while maintaining privacy.

2. Intent-Based Trading

Protocol	Chain	Mechanism
CoW Swap	Ethereum	Batch auctions, MEV redistribution
UniswapX	Multi	Dutch auctions, filler network
1inch Fusion	Multi	Resolver competition

Prefer intent-based routing for trades > $10,000.

3. TWAP Execution

For large orders splitting across time:

chunkSize = totalAmount / numChunks
interval = totalDuration / numChunks

1. Split order into N equal chunks
2. Execute each via private RPC with randomized timing (±10%)
3. Monitor cumulative slippage vs benchmark price
4. Pause if cumulative slippage exceeds threshold

4. Slippage Configuration

Trade Size	Recommended Slippage	Method
< $1K	0.5%	Public or private
$1K–$10K	0.5–1%	Private mempool
$10K–$100K	TWAP 5–10 chunks	Intent or Flashbots
> $100K	TWAP + intent protocol	CoW/UniswapX

Pre-Execution

• Private RPC configured for target chain
• Slippage and deadline set on swap params
• Simulation confirms no revert
• User confirmed if trade > $10,000

References

• references/flashbots-setup.md
• references/intent-protocols.md