The official currency in La Paz, Bolivia is the boliviano (BOB). It is advisable to carry some cash in bolivianos for minor expenses, although in the city it is common to find ATMs and establishments that accept credit and debit cards. However, in rural areas or local markets, cash is more practical. It is recommended to exchange currency at banks and official exchange offices to obtain better rates and avoid scams. Always try to carry small denomination bills for everyday transactions.