DeveloperWil

Completely disables the XML-RPC API which was introduced in WordPress 3.5 and above which lets remote clients post, upload and edit content.
Notes: 
If you are using the WordPress smart phone app or the Jetpack plugin, please note that they need this service enabled.
If you activate this plugin your WordPress phone app will not be able to connect to your site and Jetpack will not be able to connect to wordpress.com where site visitor data (and other stuff) is stored.
Other plugins and services that use the XML-RPC API will also not function properly.
<h4>Plugin Page</h4>
<a href="https://zeropointdevelopment.com/wordpress-plugins/deactivate-xml-rpc-service-wordpress-plugin/" title="Deactivate XML-RPC Service WordPress Plugin" rel="nofollow ugc">Deactivate XML-RPC</a>

Deactivate XML-RPC Service

Disables the XMP-RPC API service introduced in WordPress 3.5 and above.

rich! @ etiviti

Yuttadhammo

Eduardo

This plugin allows remote access to BuddyPress networks through an XML-RPC API.
A client application is required to connect to this BuddyPress XML-RPC plugin. 
This could be anything from a standalone WordPress plugin to an iPhone or 
Android app.
An Android app designed for use with this plugin is available on Google Play:
https://play.google.com/store/apps/details?id=org.yuttadhammo.buddydroid
For more information on using this plugin, please read the FAQ and About Page.
<h4>Related Links:</h4>
<ul>
<li><a href="https://plugins.svn.wordpress.org/buddypress-xml-rpc-receiver/" title="SVN repository" rel="nofollow ugc">Source code</a></li>
</ul>

BuddyPress XML-RPC Receiver

This plugin allows remote access to BuddyPress networks through an XML-RPC API.

Deactivate XML-RPC Service vs BuddyPress XML-RPC Receiver