The share capital of a Seychelles IBC may be denominated in any currency.
The most popular currency for IBC share capital is the United States Dollar (US Dollar), possibly because the government fee is charged in US Dollars. The US dollar is the defacto currency in international trade such that many IBCs and other offshore companies operate in US dollars. The Euro is also a popular currency but there is nothing stopping you from having British Pounds, Swiss Francs, Chinese Yuans, or the Singapore dollar as your functional currency and as your share capital currency.