As the WXT market price already increase about 0.02 USD per WXT. So if I would like to upgrade my account to premium, I nees spend 999 WXT, which cost about 20USD, previous 10 USD. With same % rewards on transaction. Exchange rate increase will cost the rewards reduced.
If the upgrade price to 9.9SGD, so should calculated with exchange rate. There is no reason for setting 0.01 based assumption
So I will discontinue the subscription next month due to I unable to get the 20USD rewards to cover my update cost.