Keyword for API of Youtube, Flickr/Google images, Twitter

I have Article Directory source in PHP, I want to work with the keyword of the article to use that keyword in the search for relevant information on Youtube, Flickr/Google images, Twitter, Answers, Blogsearch(Google), and publish such information along with articles on my web. I think using API. Your job is split sequence tag written by the author and get the sign from the front "," the series that keywords. After that using API of Youtube, Flickr/Google images, Twitter, Answers, Blogsearch(Google) to get relevant information with keywords have been processed. I do not know how much to pay for it and I put the price is 25usd. Thanks.