You can use more than 21 currencies with OkPay! The current list of OkPay currencies is the following:
USD, EUR, GBP, RUB, CHF, CZK, AUD, CAD, JPY, NOK, SEK, DKK, HRK, HUF, NZD, PLN, RON, TRY, ZAR, HKD, CNY