When you go to Google or to the address bar, and type your search query, you see various completion candidates for your query as suggested ed by google.
I thought it would be great if you could fire Helm with a shortcut key, and then type your query. The candidates are delivered by the autocompletion suggestions from Google.
I planned to develop a Helm source, in order to get this working. To find a way to connect Emacs/Helm with Google API for their search autocompletion, I found this: https://webmasters.googleblog.com/2015/07/update-on-autocomplete-api.html
Since the CSE is a paid service, I wonder if there are any Emacs packages that succesfully connects with Google's API/CSE? Then I could figure out how they did it.