The gas fee for exchanges varies based on user experience, making it difficult to definitively say which exchange has the lowest fees. However, certain tokens may have lower fees on some exchanges most of the time. In my personal experience, Binance, Kucoin, OKX, Lbank, and MEXC have had low gas fees. These exchanges are reliable, fast, safe, and offer quick withdrawals. This is just my opinion, but you can also consider other people's opinions.