best slots for players who want mathematical transparency

I’ve always preferred games where I can see exactly what’s going on under the hood, which is rare with slots. Most of the time, you’re stuck just trusting that the house edge is whatever they say it is. With blackjack and poker, you can actually calculate your odds. But with slots, unless you dig up a paytable and somehow the full math behind it, there’s always that nagging doubt - am I actually getting the return they claim or just funding the next bonus round for someone else?

I’ve noticed some slots advertise higher transparency, showing detailed RTP and sometimes even volatility charts or hit rates. Not sure how much to trust that info, but it’s a step up from the generic “fair and random” line most sites give. Anyone found a slot where the math is really laid out clean, like you could build an Excel model and see it add up? Would be nice to find something where you can run the stats yourself without a ton of guesswork. Always bugs me when a game makes you play detective just to figure out how much you’re actually risking.