Google and Bing search APIs let you develop software to retrieve search results from these major search engines programmatically.
You can use requests to get either web search or image search with these APIs.
An API key is required by the Google Custom Search API, which can be obtained from the Google APIs console.
The APIs provide 100 search queries per day for free. More results mean you have to pay for them ($5 per 1000 queries, for up to 10,000 queries per day).
Starting from August 1st 2012, Microsoft is charging for access to the Bing Search API (that previously was free) through the Windows Azure Marketplace.
For less than 5,000 queries per month people can access the APIs for free. This probably will involve most non-profits, educational institutions, and smaller scale applications.For more than 5,000 queries per month, a subscription can be purchased on the Windows Azure Marketplace. If you are only interested in web results there is a lower cost offering.
The paid service has also required some integration work by developers to accommodate some changes in the API.
A lot of resources can be found on the web explaining how to migrate to the new platform for php, .net, java, delphi, python programmers.
They now can retrieve web, image, news, and video search results, and also related searches and spelling suggestions using both XML (eXtensible Markup Language) or JSON (JavaScript Object Notation).
When they were launched, Bing's APIs have been entirely free to use, whereas Google has always charged for getting search results. The two services deal with their free quotas in a different way, so it's not easy to do a direct comparison, but it seems that Bing is cheaper in nearly every circumstance.
But what is Windows Azure Marketplace?
On Msdn Microsoft states that "The Windows Azure Marketplace is an information and application marketplace. [...] The Windows Azure Marketplace provides both trusted public domain and premium commercial data via integrated consumption experiences and easy data discovery, exploration, and purchase on any platform".
The new Windows Azure Marketplace is designed to match information providers with end users and programmers. It's probably one of the most complete cloud offerings available.
Data providers provide information that may immediately accessed by users with Microsoft applications.
When it was launched, the Windows marketplace included 77 data sets across from 28 publishers.
Data sets are from many different categories, form entertainment and media to finance; from health and wellness to mathematics.
With the revolution of cloud-based platforms, data is available for developers in one central place.
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