Is there any PoS calculator?
Would love to know this too. Can this coin be staked using the core wallet, and if so, how much is the ROE approximately?
Yes it can. I leave the core wallet on so my masternode rewards can stake. But I rarely get something before I move them.
The stake reward is 13.5 coins per block approximately.
I guess the return depends a lot on how many coins on the network stake rather than go masternode