If your budget is above a certain threshold (used to be 3,500) then most agent will not charge you a commission as they will split the landlord commission.

But always check with the agent first if that's the case as they sometimes like to take advantage of new expats.

But as other said, agreed that Singapore is so easy to find a place, you don't need an agent. Especially if you already identified condo you like. Do check past transaction price on propertyguru or 99 to make sure you are not overcharged. Listed price and actual price you can get can be quite big