| name | skill-15-mev-protection |
| description | Protects transactions from MEV via Flashbots, intent-based trading, sandwich attack mitigation, and TWAP orders. Use for high-value swaps, liquidations, or any MEV-exposed on-chain activity. |
| metadata | {"phase":2,"chains":"ethereum,polygon,arbitrum,base"} |
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
- Split order into N equal chunks
- Execute each via private RPC with randomized timing (±10%)
- Monitor cumulative slippage vs benchmark price
- 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
References
references/flashbots-setup.mdreferences/intent-protocols.md
