Antarctica is not a country and doesn't have its own currency. Since it's governed by international treaties and managed by research stations from various countries, the currency used depends on the specific station and its affiliation.
For example, the U.S. Antarctic Program uses the U.S. dollar, while the Australian Antarctic Division uses the Australian dollar.
However, you won't find any shops or businesses in Antarctica where you can spend money. The primary purpose of research stations is scientific research, and most of the supplies are brought in from the outside.
