Even if I don't have BTC/USD in my account?
you need to have btcusd in your account . you will short at 10x 20x leverage (okcoin)
ok - hold on a second. This doesn't make sense. Need to have BTC/USD in the account AND you get leverage? This is nonsensical. You either don't have BTC/USD in your account, but you can short and hence you get leverage; or you simply can't short at all.