That afternoon was truly nerve-wracking. I collateralized 0.5 ETH to borrow stablecoins, thinking I had enough buffer space, but I didn't expect the market to suddenly turn downward. Watching the price drop steadily, getting closer and closer to the liquidation line, my phone kept alerting, and my hands were trembling.

There were only two options: either urgently add more collateral or immediately sell some stablecoins to repay the debt. I finally chose the latter, though my operation was a bit messy. Fortunately, I managed to pull the sword off my head. Although I wasn't forcibly liquidated, all the profit margin I had earned earlier was wiped out, and with fees, I even lost a bit.

This experience slapped me hard. The collateral ratio must never be pushed to the limit; the market can turn around too quickly, leaving no time to react. My current principle is to keep at least 20% safety margin, so I can sleep peacefully. Doing this kind of arbitrage is about steady profit, but be careful not to turn it into a gamble of life and death.