The official currency of St Barts is the Euro but US Dollars are accepted universally with few exceptions. Credit cards are accepted at most establishments as well.
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The two main banks of St Barts are Banque Francaise Commerciale on rue de General de Gaulle in Gustavia and Banque Nationale de Paris on rue du Bord de Mer in Gustavia.

Both banks have ATMs.
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Banks are closed on National holidays.
January 1 - New Years Day
January 3 - All Kings Day
Easter Weekend
May 1 - Labor Day
May 8 - Armistice Day
July 14 - Bastille Day
August 24 - St Barthelemy Saint's Day
November 1 - All Saints Day
November 11 - Armistice Day
December 25- Christmas