Yes, as long as your building accepts payments via bank transfer you can pay MCST through ipaymy. To get started with paying your supplier, click on the 'Add recipient' button and select 'Supplier' on your dashboard and add your building's MCST as a new supplier.
You will need to provide your building's UEN. Don't know it? Don't sweat it! This can easily be found by searching for your MCST number, development name or road name on this Building and Construction Authority database.