BjornW

RESTless is a tiny WordPress plugin which disables access to the REST API (available in WordPress since version 4.4) for non-authenticated users. 
This prevents usage of the REST API by the general public and limits access to those with login credentials. No REST for the wicked.
It also supports WordPress Multisite installations.
<h3>Notes</h3>
Credits:
Sword icon used in the WordPress plugin repository and found as /assets/icon* 
From the series <a href="http://www.toicon.com/series/sketchy" rel="nofollow ugc">‘Sketchy’</a> By <a href="http://www.toicon.com/authors/1" rel="nofollow ugc">Shannon E Thomas</a>
Thanks Shannon E Thomas and to[icon] for sharing your work!
WordPress repository banner image found in /assets/banner*:
Orginal painting: <a href="http://hdl.handle.net/10934/RM0001.COLLECT.319230" rel="nofollow ugc">‘Draak’</a> 
Drawn by: <a href="https://en.wikipedia.org/wiki/Utagawa_Kuniyoshi" rel="nofollow ugc">Utagawa Kuniyoshi</a> 
Dated around 1808 – 1861 
Repository: Rijksmuseum.nl 
Modified by: <a href="https://burobjorn.nl" rel="nofollow ugc">Björn Wijers</a>
Thanks Rijksmuseum!

RESTless

RESTless disables REST calls for non-authenticated requests.

icdsoft

madjarov

This plugin helps you to automatically connect your WordPress site to the ICDSoft WordPress MultiManager toolkit available in the ICDSoft Account Panel. The WordPress MultiManager toolkit allows you to add and manage multiple WordPress sites from a single interface.
The WP MultiManager plugin opens the following custom REST-API methods:
<ul>
<li>users/</li>
<li>users/impersonate</li>
<li>users/impersonate/nonce</li>
<li>
users/impersonate/token
</li>
<li>
plugins/
</li>
<li>plugins/upload</li>
<li>plugins/update</li>
<li>
plugins/updates
</li>
<li>
themes/
</li>
<li>themes/installed</li>
<li>themes/install</li>
<li>themes/update</li>
<li>
themes/updates
</li>
<li>
core/
</li>
<li>core/update.</li>
</ul>

MultiManager WP – Manage All Your WordPress Sites Easily

Helps to automatically connect a WordPress site to the ICDSoft WordPress MultiManager tool which allows users to manage multiple WordPress sites from  …

RESTless vs MultiManager WP – Manage All Your WordPress Sites Easily