Google is dropping support for the original Webmaster Tools API, which means you can no longer obtain keywords from the content reports within Google API starting April 20th.
Google announced that the original Webmaster Tools API released in 2008 will be sunsetted or no longer operational as of April 20, 2015.
Google the new version of the Webmaster Tools API late last year but it was missing a key feature available in the first version – keyword data from the content report. The new API still does not have that data and tools using that data will no longer be able to get that data directly from any Webmaster Tools API.
Google did say you can get at some of that data by using Python, Java or OACurl scripts/code. You can also download your keyword/queries data using this Python script at any time but it won’t be coming from their API any time soon.
You can access the new Webmaster Tools API over here.