The United States Dollar (USD) is the official currency of the United States, first issued in 1792. It is identified by the ISO 4217 code USD and is commonly represented by the symbol $. The authority for issuing US dollars lies with the United States Department of the Treasury. Currently, circulating US dollar banknotes include denominations of 1, 2, 5, 10, 20, 50, and 100 dollars, along with coins in denominations of 1, 5, 10, 25, 50 cents, and 1 dollar. The U.S. Dollar ranks first globally in terms of trading volume, comprising 88.3% of the total global foreign exchange transactions. Local money changers in Hong Kong all offer the buying and selling of U.S. Dollars.

The Japanese Yen is the circulating currency of Japan, with issuance dating back to 1871. Its ISO 4217 code is JPY, and it is commonly represented by the symbols ¥ or 円. The Bank of Japan is responsible for the issuance and management of the Japanese Yen. Currently, there are banknotes in denominations of 1000, 5000, and 10,000 Yen, along with coins in values of 1, 5, 10, 50, 100, and 500 Yen. Japan has consistently been a popular travel destination for Hong Kong residents, with the number of Hong Konger traveling to Japan reaching 2.11 million in 2023. The demand for Japanese Yen exchange has remained high. Currently, all money changers in Hong Kong facilitate the exchange of Japanese Yen.