ExpressionEngine is a commercial CMS whose content API is PHP-only, with no REST endpoint.
How Sorank connects: Sorank self-hosted blog. ExpressionEngine has no API endpoint to push articles into its own blog, so Sorank publishes and hosts the SEO articles on a Sorank-managed blog (your own subdomain or subfolder) that you link from your ExpressionEngine site, with full internal linking. You still get a fully automated, indexable blog without fighting ExpressionEngine's limitations.
Public API: No · Dedicated Make.com app: No · Create-blog-post endpoint: No · API docs: https://docs.expressionengine.com/latest/development/legacy/api/index.html