Get Q2A search result

Question

I am going to make a plugin or a external site even that get search result from Q2A search engine and return the most helpful answer to the user just like the Knowledge Graph from Google. Here is my concept:
User search query -> Q2A database -> Return search result -> Get the content of the first most relevant result -> Return the answer to user.
Can anyone give me some documentation or a place to start from?

Comments

what I do for the same problem is to add my 2 sites to google custom search and use it to replace my Q2A search. You can see here:
http://www.question2answer.org/qa/52799/google-custom-search-plugin-free