Citibank is $10 grab credits
Guess so. So far, what I can gather is :
1. POSB/DBS : lucky draw for iPhone
2. Maybank : lucky draw for cash
3. OCBC : lucky draw for cash
4. SCB : $10 sign up promo
5. UOB : $5 sign up, another $5 when do transfer with app
6. HSBC : ???
7. Citibank : ???
Disclaimer : pls refer to the individual banks for T&Cs...

