Currency in Saint Barthélemy euro (EUR €). For 10 US dollars you can get 9.33 euros. For 100 US dollars you can get 93.3 euros. And the other way around: For 10 euros you can get 10.7 US dollars.
If you're planning a trip to a specific region of the world, might it be cheaper than in Saint Barthélemy? Check out prices in nearby countries: Anguilla, Saint-Martin (French part), British Virgin Islands, Saint Kitts and Nevis, and Virgin Islands.