It is true that many traders use USDT swaps to do their volume trading, as this allows them to take advantage of the high liquidity of USDT and the low transaction costs associated with it. However, there are other options available to traders as well, such as using cryptocurrency exchanges, over-the-counter (OTC) trading, and even decentralized exchanges. Each of these options offers different advantages and disadvantages, so it is important to understand the different options available and to choose the one that best suits your trading needs. Ultimately, the best volume trading service will depend on the individual trader's goals and preferences.