You may have been billed in USD for some of our products (i.e SSI Community Membership Renewal Plans). This is because our product is not just based in Singapore but internationally as well.
This amount will be converted to the base currency of your credit card, so the amount converted may vary from time to time.
If you wish to save on transaction fees, you may try using a prepaid debit card with preferential foreign exchange rates. Some examples of prepaid cards include Revolut and YouTrip. (Disclaimer: We do not endorse or have been sponsored by these products and/or companies)