The Tapir API is really 3: Search, Ping and Post to give you the power to make your blog searchable, get your articles indexed immediately, and push content manually. Indexing of the Rss feed is done at 15 minute intervals. According to the API documentation, the results are returned in JSON or JSONP.
While adoption and usage of APIs tends to vary widely across different vertical industries, the one segment that has benefited most from APIs is online media. Thanks to APIs, the cost of distributing online content has dropped significantly thanks to online properties that need to content to attract people to their sites.