The API will let you query the Knowledge Graph for information on various entities. The API uses standard schema.org types and complies with JSON-LD specifications. Google will replace the Freebase Suggest Widget and the replacement will be released early in 2016.
Freebase API and Widget will be supported for 3 months after the release of the replacement. Stay updated on future improvements follow https://plus.google.com/+GoogleDevelopers.Google Brings Knowledge Graph Search API, To Close Freebase API!,