If you read the current release notes
https://helpx.adobe.com/content/dam/help/en/EchoSign/Adobe-EchoSign-Apr15-Release-Notes.pd f
you see the Premium version has an API and offers Account Sharing and Users and Groups. The release notes do not say you need premium but I you can see the UI screenshots are for a premium user.
I would be interested in having the ability to tell my PDF signature field, that when I am signed, place this document in this Sharepoint folder. The folder would then have it's own notifications and work as a work que for some person or group.
Same idea for Alfresco, or CRM systems.
Is there a premium DC account or do you need to get an enterprise offering of some kind?