Coinbase sux. My wife and I had accts and could buy and sell no problems at first. Then all of a sudden we had to reverify our info like SSN and address. But upon doing so we get unknow error each time. Coinbase says it's a problem with 3DSecure. They wouldn't even let me withdraw my funds from my USD wallet. Oddly, they let me buy $22 at a time so I had to do 70+ transactions just to be able to convert my USD to BTC and send it to poloniex. I racked up $100 in fees. Horrible customer service who give canned repsonses each time. They plain suck.