Price of premium version is 0.1 ZEC or equivalent in any other currency/wallet.
The premium version offers the user to use a certain range of commands via a telegram bot. This list includes such commands as: /clear, /info, /ping, /pool, /profile, /restart, /server, /startover, /stop, /online. And also receive notifications from the bot when the farm is offline.
the one mentioned in the first page