Peidong Hu

Basically this plugin creates XMLRPC interfaces for Gallery Plugin. 
 Thanks for the author of Extended API, Michael Grosser, since this plugin has reused the design. 
 NOTE: API functions (xmlrpc revoke functions) are all prefixed with ‘i_gllrxmlrpc’.

Gallery Plugin XMLRPC Interface

This plugin creates functions for Gallery Plugin which can be XMLRPC invoked remotely.

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.

Gallery Plugin XMLRPC Interface vs Deactivate XML-RPC Service