Looking for the fastest way to get USDT during market swings

When the market gets volatile, I sometimes want to move my position into Tether quickly to avoid losses, but my usual exchange takes forever with bank transfers. By the time the deposit clears, the moment has passed. I need a method to get USDT almost instantly, preferably with a card or a direct payment method that doesn't take days. Does anyone know a reliable service that focuses on speed for buying stablecoins like USDT?