Hasura is an application which gives you an instant GraphQL/REST API based on your database schema. As of writing it supports Postgresql, SQL Server and Big Query databases but MySQL, Oracle and Elastic are also in the pipeline.
Graphene is a great library that can help expose endpoints with a relatively little configuration. Adding new endpoints is simple when you get a grasp of graphene code conventions. This allows rapid development of APIs that expose data in logical and easy to follow ways.