You can make requests to Test and Production endpoints of Keyword Tool API.
Please, keep in mind that successful API requests to the Production endpoints will be counted towards the limits according to your API plan.
We recommend using the Test endpoints for the development purposes. Please note that test API endpoints will provide dummy data. To get the actual data, you need to use the production API endpoints.
You can find detailed description of the various API endpoints over here:
Updated about 5 years ago