Minimum $1 · never expires
Put in as little as a dollar. There is nothing recurring, nothing to cancel, and no expiry date — so there is no reason to add more than you actually want.
Amount
A typical month of watching is about 47 hours.
Card processing is 2.9% + $0.30 on every payment however small — that is the card networks, not us, and we pass it through at cost rather than folding it into the price. It is also why there is a $1 minimum: below that the fee would be most of what you paid.
What that buys you
You choose the quality while you watch and can change it any time — the player never switches it for you. Dropping from 1080p to 480p takes you from 20 hours to 36.7, and you will see the number jump when you do it.