There are eight most active currencies in the market, namely: US dollar, Euro, Japanese yen, British pound, Swiss franc, Australian dollar, Canadian dollar and New Zealand dollar. Among them, the currency pair composed of the US dollar and other currencies is the most important, and it is called the major currency pair. Now it can be operated online through the exchange. It seems that the criteria for judging a good trading platform are supervision and bank depository, such as domain kingdom.