Accessing Wolfram|Alpha’s Knowledge Through Webservice API
The responses are computed by Wolfram|Alpha in real-time using a supercomputer-class cloud infrastructure. The cloud needs fast processors and relatively little storage contrary to search engines which need lots of storage but slower processors. Search engines look through existing web pages or documents while Wolfram|Alpha computes query results based on raw data.
The queries sent to the API need to have the following REST-style format:
The API is accompanied by several language bindings helping developers to start integrating such API calls in their programs. The languages covered are: .NET (VB), Perl, PHP, Python, Ruby, and soon to come C++, Java and Mathematica.
The API Reference document offers detailed information on how to make API requests and how to interpret the response. A pricing plan applies based on the number of requests sent per month. Grants are offered to selected start-ups and developers writing innovative applications using the API.
It's not free
Todd Montgomery Dec 19, 2014