I can get you a Sync Token for €29 / year, but you can also get one yourself, just read below.
Get a Sync TokenYou can use a Cloud Service Provider like IBM Cloudant.
You can also setup your own hosting or setup CouchDB on your computer with Bitnami.
After you get either done, you create a DB (any name works) and then the Sync Token is the full DB URL with username and password, like https://user:pass@hostname/dbname
(no trailing slash!).
With a Sync Token, you can also use the web app (beta).