1. Install StackSync REST API.

   $ sudo python setup.py install

2. Edit your proxy-server.conf pipeline to enable the StackSync API module.

   [pipeline:main] pipeline = healthcheck cache authtoken keystone stacksync-api proxy-server

3. And add the WSGI filter below:

   [filter:stacksync-api] use = egg:stacksync-api-swift#stacksync_api stacksync_host = 127.0.0.1 stacksync_port = 61234

4. Restart the proxy:

   $ swift-init proxy restart

You can see the API specifications here