We didn't touch 500 on bitstamp. It went to 499.99 and then came down all the way to 485 from there. People dump at 1 cent less, which is funny.
Lol on bitstamp we hit $502 and then it went down to $485.
On the day's range it shows $401.04 - $499.99 . No idea why would you see 502 and I would see less. Probably their way of fooling people and making some money out of it

. JK, but anything's possible.