According to the search results, the most expensive currency in the world is the Kuwaiti Dinar (KWD) . It has been the highest-valued currency since it was first introduced in 1960. As of November 2023, one KWD is equal to approximately 3.23 USD. Other currencies that are also considered strong and valuable include the Bahraini Dinar (BHD), Omani Rial (OMR), Jordanian Dinar (JOD), British Pound (GBP), and Swiss Franc (CHF) . However, the US Dollar (USD) is the most traded and strongest currency in the world.