4 Shocking Reasons Backlink Indexing Services “White Hat” – https://shinyobjectreviews.com/blog/do-indexing-services-work/ – These are just the services that WordPress recommends, however, there are MANY more! If you want my complete list of XML-RPC Pinger Services to add to your ping list, click on the link below to put your WordPress ping update services on steroids.
Are blog indexer is still relevant in 2017?
In my opinion, they are. Even armed with the ping list above you still have no control over who Blogger is pinging (which ironically, is one of the hardest syndication points to get indexed even though it’s a Google property). They don’t cost much, harm your site, and in the worst case scenario, you might have to wait a few days for your posts to get indexed.