Is there any API that I can use to rank search terms according to their popularity? An official Google API was announced to be released, however there isn't any. Any suggestions on what I may use alternatively?
There are some open source API's available to Google trends.
In node: https://www.npmjs.com/package/google-trends-api
In Python: https://github.com/GeneralMills/pytrends
In Java: https://github.com/elibus/j-google-trends-api
Java client side: https://github.com/elibus/j-google-trends-client