Twitch Prime,
It usually costs $8.99 to subscribe to a Twitch channel for a month, but Twitch Prime lets you subscribe to one channel for free every month.
To get you free monthly subscription to any channel of your choice, sign up to Amazon prime for more details.
Whenever you send a chat message, your messages have a small icon that looks like a crown. This is a badge that is given only to Twitch Prime members.