Life on the web is full of search terms and human filtering. Even good results often require some effort to determine which has the information we seek. There are several services attempting to help with this problem and they're making their applications available via API.
Yolink launched its Web Service, which looks behind the search results of other sites, such as Google and Craigslist. The key behind Yolink is that it is able to extract the portion of a page that best matches the query.
Semantic Web explained the service:
The Yolink API... will let others apply its ability to, on the fly, look at content behind links and surface the key information behind keyword searches. The greatest value will be for multi-task, multi-step searches that go beyond the casual user's quests – research purposes, for example.
The screencast embedded below also gives a good overview.
Like Yolink, Factery sees the API as its main service, as we wrote:
Factery is a rare API in that the API is the service. It’s not an add-on, where you can just build off of their data. Factery is not a destination–it’s sole purpose is to be incorporated into your applications.
The API can calculate mortgage interest, retrieve the age of a celebrity and many other calculations. Like Yolink and Factery, Wolfram Alpha is part of a class of APIs that are pulling knowledge--not just data--from search queries, giving users and developers access to more useful results.