cat currency is measured in hours sleeping in comfort, so I guess they have that from two sources, secure enough to bank on it

I guess it’s the income of its owners.

food. cos it’s being fed by its owners and then it goes visiting the neighbors who also feed it. that’s two incomes. though i dunno how passive it is, since the cat still has to meow for it and then actually do the work of chewing and swallowing it.