Well, they had a category (maybe still do) called "Pay once games" or something like that. Basically highlighting games that you paid for once, up front, like normal games, and that didn't have a bunch of IAP.
They also show on every single app whether or not it has IAP (and you can see what the IAP is with a tap), so you can do your own filtering when looking at the new games list if that's an important criteria.
But you often have to play the game for half an hour before you start running into really gross IAPs, though. If you want to find games that don't have those predatory game loops and IAPs, the only way seems to be to go outside of the app stores and find review sites - but no site can keep up with reviewing every game that gets released.
I dunno, if you look at the list of IAPs offered, and see that most are for "gems" or "coins" or something like that, you can be pretty sure that they've got something up their sleeve.
Usually the reviews on the app store itself are enough to tell if the IAP is particularly intrusive. I've skipped plenty of games after finding the reviews full of people complaining about it. Similarly, I've played some IAP games after app store reviews praised the game for making the IAP not intrusive (and the reviews were right).