Data Source Handbook by Warden Pete

Author:Warden, Pete [Pete Warden]
Language: eng
Format: epub
Tags: COMPUTERS / Data Modeling & Design
ISBN: 9781449303884
Publisher: O'Reilly Media, Inc.
Published: 2011-01-27T16:00:00+00:00

Wolfram Alpha

The Wolfram Alpha platform pulls together a very broad range of facts and figures on everything from chemistry to finance. The REST API takes in some search terms as input, and returns an XML document containing the results. The output is a series of sections called pods, each containing text and images ready to display to users. Unfortunately there’s no easy way to get a machine-readable version of this information, so you can’t do further processing on the data within your application. It’s still a rich source of supplemental data to add into your own search results, though, which is how Bing is using the service.

If you’re a noncommercial user, you can make up to 2,000 queries a month for free, and you can experiment with the interactive API console if you want to explore the service. The commercial rates range between two and six cents a call, depending on the volume. The terms of use prohibit any caching of the data returned from the service and you’ll need to sign up for a key to access it:

curl "http://api.wolframalpha.com/v2/query?\ appid=<key>input=General%20Electric&format=image,plaintext,cell,minput" <?xml version='1.0' encoding='UTF-8'?> <queryresult success='true' error='false' ... <pod title='Latest trade' scanner='FinancialData' id='Quote' position='200' error='false' numsubpods='1'> <subpod title=''> <plaintext>$19.72(GE | NYSE | Friday 1:00:18 pm PST | 27 hrs ago)</plaintext> ...

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