I know there is no sequence API. But we need to enroll contacts into sequences programmatically. We have an app that we use at conferences, and we enroll people into a 4 email drip campaign after the conference.
The reason we can’t use workflows, (which we do now) is because workflows don’t have reply detection. So when someone replies to a workflow, they still get the next 3 emails. So they get angry.
The right tool is sequences because it has reply detection, (unless workflows can get reply detection one day). But I can’t enroll people without a human. (Or scraping I guess)
You can indeed use workflows to enroll contacts in a sequence if you have the Enterprise Sales or Service Hub. With these plans, you have access to more advanced features in workflows, including reply detection.