These hidden website or underground site mainly deals with the illegal products as like drugs, rifles, hacking tools or any other illegal services. Reaching these site is not much easy as they are hidden and frequently changes there web address.
“I am working on the algorithm so it is a lot like google's it will have a scoring system based how long the listing has been up, how many transactions, how many good reviews. That way you will see the best listing first,” Grams’ creator who calls himself Gramsadmin wrote on Reddit. He also added, “I am going to add a filter market this week so a use can search only the markets they have accounts for.”
Currently Grams is crawling and indexing results from 8 different sources of black market such as SilkRoad2, Pandora, Agora, BlackBank, C9, Evolution, Mr. Nice Guy, and The Pirate Market. Developer of Grams is trying to contact with the other site owners of the underground website's to offer them indexing the website on his search engine.
Gram is same like Google, as you type the query on Google search bar same as you have to search for a product that you like to. It gives all the possible site links where you can find your product.