pay only for indexed 3

https://blast-wiki.win/index.php/Why_Your_Site_Needs_a_Reliable_Link_Indexing_Service_for_Better_Google_Visibility

With pay only for indexed, you aren't charged for every document you store, just for the ones that show up in search results. This makes a huge difference when your archive is full of old or rarely accessed files, because you only pay for what people actually find and use.