The most you can add at once is $1,000. You can always add more later.
20% bonus on $100 or more. The bonus maxes out at $70, so $1,000 becomes $1,070.
$100 -> $120 | $200 -> $240 | $350 -> $420 | $500 -> $570 | $1,000 -> $1,070
Sent by email. Never expires, bonus included.