MRT (subway) and buses have the city covered from ~6 am to midnight. Waiting time is ~<3 min or <10 min for MRT or buses, respectively. MRT is ~1 USD/trip; buses, ~0.5 USD/trip, with automated 50% discount if you just got out of MRT. Most people use cards (either stand-alone or built-in a CC) to use MRT or buses.