The number of available web search APIs has been reduced in recent months; Google and Yahoo have shut down a number of their web search APIs. This is the first part of a two-part article covering the state of web search APIs. The second part highlights search APIs provided by Google and Microsoft.
Google announced the Firebase App Indexing API. The API allows users to search for content within the Google app and find personal or public content across apps installed on a particular device. Because the content is stored on the device, the API is functional whether a user is online or not.
Innovation in web service APIs is not always technical, sometimes it's about money. Such is the case with Yahoo's announcement that later this year they will begin charging for usage of BOSS (Build your Own Search Service), their search web service for developers. Given that search revenue is typically ad-driven, and that advertising doesn't typically mesh with APIs, this has meant that search APIs have been one of the most challenging classes of APIs for providers to monetize. So it's notable to see how Yahoo has chosen to tackle this: via a 'utility' pricing model, somewhat akin to how infrastructure services like Amazon Web Services charge by usage.