The CMC USD Index is a forex CFD basket made up of a collection of currency pairs that share the same base currency, the US dollar, including major crosses USD/JPY, USD/CHF and USD/CNH. Forex indices can provide a benchmark overview for the international value of a currency, as they track the underlying prices of currency pairs. If individual forex prices appreciate, then this will increase the overall value of the basket, and if the forex prices depreciate, the overall value of the basket will decrease. Trading on our forex index CFDs is an effective way of diversifying your portfolio, and it can help to offset currency risk. Spread bet or trade CFDs on the CMC USD Index.