What is the best indexer tool?

Hi Guys, how r u all? ..
I just got on Fiverr but you know, a lot of bullshit! .. When I write to anyone who has a backlink index service, he tells me that I do not guarantee that you will index links, I know that there are basic factors for indexing links and they are available in all the links I have

So I want your advice, and I hope it is from experience, what is the best tool for index backlinks?... (from experience)