Is StashAway worth venturing? Will we be losing the conversion rate to USD even before we trade?

As an investment platform, I would consider other roboadvisors due to lower cost and individual custodian account. See more here: https://seedly.sg/questions/why-stashaway-when-...

As for conversion, it is inevitable if the investment is priced in a foreign currency (USD). While investing abroad may give potentially higher returns, you will also be exposed to foreign exchange risk. As a retail investor choosing an economy to invest in, we should also take into account the country's economical and political standing to judge the associated risk in the future.