The USDX is a widely traded instrument that measures the strength of the US dollar against a basket of foreign currencies. Trading the USDX can offer several advantages, including diversification and exposure to multiple currency pairs. To trade the USDX, you can use a forex or futures broker, take a long or short position depending on your view of the US dollar's strength, and stay informed about factors that can affect the value of the USDX, such as interest rates and economic data.