Trovit doesn’t (and will never) ask for any kind of payment for you to access its search results.
However, and since we work as a search engine, every now and then, a website in those results might work with a paid subscription model. These websites are not a part of Trovit and the way they show their ads are not under control.
Our mission is to offer you every single listing available. The vast majority of websites in the Trovit search results are for free, but if you find a paid one it is your call to decide whether you set up a subscription with them or not.