The currency with the highest global contribution is the United States Dollar (USD). It serves as the dominant global reserve currency and is widely used in international trade and finance.

The currency with the highest contribution in global foreign exchange trading is the U.S dollar . It accounts for over 88% of all currency trades, making it the most widely used currency in the Forex market. The dominance of the USD is primarily due to its status as the world's primary reserve currency, widely accepted for international transactions. Many commodities, such as oil and gold, are priced in U.S. dollars, further solidifying its importance in global trade. Other significant currencies include the euro (EUR), Japanese yen (JPY), and British pound (GBP), but none match the USD's extensive reach and influence.