If i watch something on demand but no fee pops up and it just lets me watch it, does it cost anything for that watch?
No. They make it pretty clear when they are charging you. There is a bunch of "free" on demand.
As mentioned, you should not be charged if there is no popup.
That said, I would STRONGLY recommend creating a Purchase PIN. Even if it's a simple 1234, it's an extra popup to make it harder to accidentally be charged.
Cool thanks, yeah we got kids so I had to go in and block all kinds of stuff and setup a lockdown pin right from the beginning.