&gt; can you cite a RESTful cloud storage API that&#x27;s consistently implemented between providers?<p>It&#x27;s been a while since I&#x27;ve worked with it, but IIRC, WebDAV is one example.<p>&gt; Dropbox&#x27;s old API was REST<p>That&#x27;s not REST.  It&#x27;s that weird anti-REST where people define URI patterns instead of media types.  I don&#x27;t know why it became trendy to label things like that REST, but they aren&#x27;t.