How do services to determine the position of the site in Yandex work?

Question

Yandex

Hello! I would like to know how the services for determining the position of the site in Yandex work? The fact is that you can parse the output (then there will be a captcha, there are of course services that automatically drive in a captcha, but they are paid, and services for determining positions are most often free) and you can parse Yandex xml, but now the xml limit depends on how much sites are in Yandex webmaster and how popular they are (this option is also limited, because the limits may not be enough for all users). Therefore, from here the question arises - how do such services work? How do they parse the issue?

Answer 1

Once upon a time, "a friend of mine" had a dozen servers and used hundreds and thousands of proxies for such cases.