I have been to Vegas and played a bunch of times. Nearly all of the agencies and every single one of the numbers in the ads and on the truck/billboards are fake, bait & switch ripoff artists. Don't bother. Last time I went, pre-COVID, there was 1 decent agency, 100 Proof, no idea if they are still around, but they were legit and I used them several times. It will not be cheap. If you get laid for less than 400 USD you have accomplished something. There is an MP scene, but I never bothered with that. A cab driver can tell you all about it.
You can check US based sites, like Eccie that have good info. TER can be useful, if you want to pay. Eros and Slixa have listings for Vegas, use your head and stick to well known indies. If you want to splurge, lots of porn stars live in Vegas and escort, or they visit and work while there.
Some Uber drivers or even cabbies will work out a deal to take you out of town to one of the ranches. Don't bother. 200-300 for the drive and at least 400-800 more to have any fun. Not worth it. If someone approaches you on the street, walk away. When they are not busy, the LVPD runs plenty of stings but always on the street. They don't normally work inside the hotels however and you can find bargirls in almost every strip hotel lobby bar. Sit alone after midnight, order a drink and one will be along. You can expect to get a stupid high quote to start with, but you can usually get them upstairs for 300. Service levels are all over the map. Rip offs are common, but you hear stories of unreal gems who fuck all night for 500. Stick to your own hotel, most bargirls won't change properties or walk with you anywhere else because they have bribed the security to look the other way at only one hotel and there are territories, just like on the street back in the old days.