The currency of Oman is the Omani rial (OMR), divided into 1,000 baisa. Foreign currency can be exchanged at banks, exchange bureaux, hotels, and at the airport. Outside banking hours, moneychangers operate in the evenings and at weekends. US Dollars are recommended. American Express, MasterCard, and Visa credit cards are readily accepted in large shops and hotels and by an increasing number of traders in souqs. Most banks in cities and towns have ATMs.