Keywords API will be sunset on June 1st, 2018
As announced on February 5th, 2018, the Keywords tool in the HubSpot application will be sunset on of June 1, 2018, and the Keywords API will no longer be available for development use. The team has been working with integration partners that have built any applications on this API. If you have not received this notice or still have outstanding questions - please reach out to your HubSpot contact, our Support team or comment below.
The Keywords API presented a poor developer and end-user experience; values returned from the Keywords endpoint have been incomplete since 2013 when Google began adding an "SSL not provided" to search queries.
There are no plans to replace the Keywords API. However, if you still have a use case or any ideas, please add your voice to the discussion thread here.