The big three networks
DBS/POSB run the largest combined ATM fleet, then OCBC and UOB. Their cash deposit machines (CDMs) credit notes instantly, 24/7.
The atm5 shared network
Customers of several smaller banks (including Standard Chartered and Maybank) withdraw fee-free on shared atm5 machines — look for the atm5 logo.
Do it in-app
PayNow transfers, GIRO setup and even branch-code lookups are faster in digibank, OCBC Digital or UOB TMRW than at any counter.