ExpressionEngine is a mature publishing platform, but it offers no public API to create posts from an outside service. Its developer API is meant for add-ons running inside the install, not external automation. Sorank still gives you a fully automated SEO blog on your own domain.
ExpressionEngine's API surface targets templates, channels and add-on development, not remote content creation. Pushing an entry from an outside tool means building a custom add-on and maintaining it. Instead of that overhead, you let Sorank host the blog for you.
Sorank publishes and hosts your articles on your own subdomain, for example blog.yourdomain.com, linked from your ExpressionEngine site. Every post strengthens your domain authority.
Full walkthrough: Host your blog on Sorank. For developer context, see the ExpressionEngine API docs.
Add a Blog link in your ExpressionEngine navigation pointing to your hosted blog subdomain. Visitors move smoothly between your main site and your blog, and Google indexes both under your domain.
Can Sorank publish directly into ExpressionEngine? No. There is no public API to create entries from outside, so the hosted blog is the reliable route.
Do I keep my content if I leave? Yes. Export your whole blog any time and re-import it elsewhere. Your content is always yours.
Does the hosted blog cost extra? No, it is included in your Sorank subscription.