The Google Discovery Service API provides a way to build client libraries, IDE plugins, and other tools that interact with Google APIs. It provides a lightweight, JSON-based API that exposes machine-readable metadata about Google APIs, including: a directory of supported APIs, a machine-readable "Discovery document" for each of the supported APIs that includes, a list of API resource schemas based on JSON Schema and more. All calls to the API are unauthenticated, REST requests that are built on two concepts; The APIs Directory: a list of all APIs that are supported by the APIs Discovery Service, and the discovery document; a machine-readable description of a particular API.
Twenty-Two APIs have been added to the ProgrammableWeb directory in categories including SEO, Sports, Background, and Messaging. Highlights include several APIs for integrating with Cryptocurrency exchange services and several Google APIs. Here's a rundown of the latest additions.