One question that the YQL and Pipes teams get asked is “how can I get stock quotes? There isn’t an API for it on developer.yahoo.com”. Interestingly, while there isn’t a more traditional web service API, Yahoo finance does provide a very nice way to get a lot of well structured information on a given company. For example, here’s Yahoo finance page on Yahoo
The Yahoo! Query Language (YQL) platform enables developers to query, filter, and combine data across the web.
The YQL Web Service enables applications to query, filter, and combine data from different sources across the Internet.