If you have USD in Coinbase that you'd like to buy with right now, you can use your Coinbase account at GDAX and transfer USD instantly to GDAX. Trades are wor

If you have USD in Coinbase that you'd like to buy with right now, you can use your Coinbase account at GDAX and transfer USD instantly to GDAX. Trades are working fine at GDAX. Pretty sure GDAX is also owned by Coinbase. I did it just now.