The Knowledge Graph API Search API allows developers a quota of up to 100,000 (one hundred thousand) read calls per day per project at no charge.

The basic structure of the query is to find, or match, entities and return those entities, where the entities you want to find are identified in parentheses. For example, the query MATCH (e) RETURN e returns entities of any type. The number of entities returned is only limited by the knowledge graph's configuration.

Google's search results sometimes show information that comes from our Knowledge Graph, our database of billions of facts about people, places, and things.