By default, Kristal accounts are maintained in USD, this is because the majority of our ETFs are US-domiciled funds. Hence, when you fund your account and the minute the funds are sent to the brokerage, your SGD will get converted to USD at 0.2% of the market rate (as of when the funds are sent).
The formula will be: [Exchange rate] - 0.2% X [Amount you have funded]
For example, assuming the exchange rate for SGD-USD is 0.75 and you want to fund SGD 100.
It will be: 0.75 - 0.2% x SGD 100 = USD 74.85/