Oman’s national currency is the Omani Rial (OMR), with the lower denominations known as ‘Baisa’. Rial notes range from OMR 1 to OMR 50, while Baisas are available in note form in denominations of 100 and 500 with 1,000 Baisa equating to One Rial. Coins are also available in 5, 10, 25 and 50 Baisa denominations but may not be accepted at all stores and outlets.
The Omani Rial is the third highest-value currency in the world and the Central Bank of Oman https://cbo.gov.om/ provides updated information on foreign exchange rates and the history of the currency. Most banks in Oman provide Visa or Mastercard facilities through their branches and ATMs.