The Google OpenID API lets third-party web sites and applications let visitors sign in using their Google user accounts. The OpenID standard allows users to nor have to set up separate login accounts for different web sites, and conversely, frees web site developers from the task of managing login information and security measures. OpenID achieves this goal by providing a framework in which users can establish an account with an OpenID provider, such as Google, and use that account to sign into any web site that accepts OpenIDs. This page describes how to enable a web site or application to accept a Google user account for federated login.
Our API directory now includes 134 security APIs. The newest is the Universign API. The most popular, in terms of mashups, is the Google OpenID API. We list 8 Google OpenID mashups. Below you'll find some more stats from the directory, including the entire list of security APIs.
Google has announced some new features available for its OpenID API. As some of our readers may remember, earlier this year Google released a "Hybrid Protocol" API that combines an OpenID federated login with OAuth access authorization. The API has been enhanced with some extended Attribute Exchange fields and a pop-up user interface for the user-facing approval page.