How I Built a MEV Bot That Prints $500/Day (And Why You Shouldn't Copy It)
The Hook
I deployed a sandwich bot on Arbitrum. Made $15K in week one. Then lost it all in day 8. Here's the post-mortem.
Architecture
Mempool monitoring → Bundle construction → Flashbots relay → Profit calculation
The Stack
Rust + ethers-rs + mev-share-rs. 50ms latency budget. $200/month RPC costs.
The Math
Gas cost: 210k * 2 gwei = $0.84. Min profit: $2.50. Win rate: 67%.
Why It Failed
Competition: 50+ bots same strategy. Gas wars → 15 gwei → margins evaporate.
Lessons
MEV is a zero-sum game. The house (validators) always wins. Build value, not extract it.
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