How can I get x most valuable companies using some finance APIs?

Question

I need to find a Web Service which allows me to retrieve the following type of data:

The 30 most valuable companies, and for each company the following information:

• Company name, symbol, state and zipcode
• Current market price of the stock
• Change in the price of the stock since yesterday’s market close.
• Beta value of the stock

Thanks in advance!

Answer 1

I would expect to obtain this information from Forbes. As Steve suggested, you should get it from xignite.com . Apparently, Forbes makes their data available through them: http://www.xignite.com/News/PressRelease.aspx?articleid=86

You might also have a look at Yahoo Finance: http://www.gummy-stuff.org/Yahoo-data.htm.