SilverStripe is an open-source CMS; the official RestfulServer module exposes create endpoints.
How Sorank connects: via Make.com (webhook bridge). SilverStripe exposes an API with an endpoint to create blog posts, so each article Sorank generates is sent to a Make.com scenario through a webhook, and Make publishes it to SilverStripe using Make.com's generic HTTP module. Sorank has no native SilverStripe connector, but the webhook plus Make route automates publishing end to end.
To validate on a live SilverStripe account before promising a turnkey setup. If the create-post call is not available, fall back to Sorank's self-hosted blog.
Public API: Partial · Dedicated Make.com app: No · Create-blog-post endpoint: Yes · API docs: https://github.com/silverstripe/silverstripe-restfulserver