“What’s the catch?” = Apa imbalannya?
When someone did something for you and you feel like he wants something in return, you can say “What’s the catch?”
A: I brought you a bacon tart. = Saya bawain kamu tart bacon.
B: Hmm.. What’s the catch? = Hmm… Apa imbalannya nih?
A: Nothing. = Gak ada kok.
You can also say “What’s in it for me?” to mean “What will I get?” or “Will I get paid?” for something you did.