The U.S. Prime Rate is a commonly used, short-term interest rate in the banking system of the United States. All types of American lending institutions (traditional banks, credit unions, thrifts, etc.) use the U.S. Prime Rate as an index or foundation rate for pricing various short- and medium-term loan products. 3 Because of insufficient current data, the published rate is a republication of the prior day's rate Note starting with the March 1, 2016 rate, the published fields changed. To view historical data fields use the Federal Funds Data Historical Search. a The data source and the calculation methodology changed starting with the March 1, 2016 rate The lastest in Interest rate swap news, LIBOR and swap rates. Home / News Interest Rate Swap Education Books on Interest Rate Swaps Swap Rates LIBOR Rates Economic Calendar & Other Rates Size of Swap Market Interest Rate Swap Pricers Interest Rate Swap Glossary Contact Us