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Ethiopian Birr (ETB) is the local currency and it is available in denominations of 5, 10, 50, 100 and 200 notes. It is easy to exchange US dollars or euros into ETB at the airport or any Ethiopian bank upon arrival. Nevertheless, note that Ethiopian banks will ask you for a receipt proving your foreign currency exchange in case you want to change ETB back to your foreign currency before leaving. Bank opening hours are usually from 8am to 5pm (Monday to Saturday).
Credit cards are not commonly accepted for payments apart from hotels, but you can use ATM machines in Addis Ababa. ATMs are also becoming common in other main cities too. Please check the transaction fees of your bank before using an ATM and note that 10,000 ETB is normally the maximum amount that can be withdrawn per day with multiple withdrawals.