I just sent you a PM with contact info on the private agency and Toolman and I use. Read his report. It is difficult right now and the exchange rate is high right now so you can find some real hotties cheap. I found a model from Italy for less then $100 US. In the US she would have cost $1,000 for sure.
I like to go to termas at night. Solarium in Leblon and 4X4 downtown. 4X4 usually has a LOT of great girls. Cheap place but only opened Monday to Friday. Solarium is Monday to Saturday. You would need to Google the address.
I use Uber all the time, very cheap and reliable. The terma girls are great. If you hit it off with one they will gladly come to your apartment/hotel when they are off.
As for web pages I use
http://www.hotside.com.br/ and
https://www.riosexsite.com/
Girls do not host, they always come to you as most live in not so nice areas.
Everyone uses WhatsApp to communicate with. I use Google Translate and WhatsApp and get along fine.
There are some good places for massage only but normally if a girl comes to you it is for full service and it's some of the best full service you have ever had in your life.
Remember that if some girls ask for $400 RL for an hour that is only $77 US!