Here is an overview of the prices for online GPs/masseurs in Rio based on the ones that I contacted (using a Brazilian WhatsApp number and writing in Portuguese) while in Rio last month:
150, 200, 200, 250, 250, 300, 300, 300, 300, 300, 300, 300, 300, 300, 350, 350, 350, 350, 350, 400, 450, 500, 600.
Sources were GCL, Grindr, VL and Skokka. I only met with a few of those GPs.