I Built a Flash Loan Bot When I Couldn’t Afford Dinner A story about DeFi, desperation, and what it actually feels like to deploy your first smart contract to mainnet. I was hungry the night I …

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A self-taught developer shares their experience building a flash loan arbitrage bot on Polygon mainnet using Aave v3, Uniswap V3, and QuickSwap. Despite successfully deploying a working smart contract and price checker, live data revealed only a 0.06% spread — far below the ~0.7% needed to break even after fees and gas. The post reflects on the gap between a technically functional system and a profitable one, and explains why MEV bots dominate on-chain arbitrage opportunities before retail participants can act.