I have 50,000 spare cash, which bank account in Singapore offers best interest and liquidity? SDIC says to offer safe guarding for our deposit. Anyone have experiences before in this SDIC?

Off-hand I would say that SDIC has not had to pay out since it's inception as I do not know of any incidences where banks/insurers have failed to payout to their clients in Singapore due to default.

With effect from 1 April 2019, the limit has increased to $75,000

https://www.moneysense.gov.sg/articles/2018/10/...

I've done a full write up on elastiq plan, comparing it with SSB and Singlife Endowment for 3years. These plans are for liquidity. https://www.theastuteparent.com/2019/01/elastiq...

you can consider ELASTIQ :) flexibility of funds after 90 days at guaranteed 2.02% pa for first 3 years. https://tiq.com.sg/product/universal-life-insur...

or of course, SSB.

UOB One Account gives high interest rates (2.43%) only if you can set aside $50,000 as savings deposit and able to spend at least $500 on a participating UOB credit card.