Yes, you can buy USDT via Gate io with your Visa card. Gate io has made it easy for users to purchase cryptocurrencies using fiat currency. To buy USDT using your Visa card, simply go to the Gate io website and select the ‘C2C’ option. From there, select the ‘Buy’ tab and enter the amount of USDT you wish to purchase. You will then be asked to enter your payment information, such as your Visa card information. Once you have entered the required information, your purchase will be processed and the USDT will be credited to your Gate io wallet.