From their site: Yahoo! Site Explorer APIs provide access to information about your site from the Yahoo! Site Explorer service. These APIs help you better understand your traffic and usage -- querying for the pages in the Yahoo! index and the sites linking into a site. They will be useful to anyone looking for a good grasp of who is linking to you and to create an effective alternative to easily-spammed trackback.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.