Yesterday, OKCoin International announced USD deposits have been blocked:
Starting from today (April 18th, 2017), OKCoin would temporarily suspend USD deposit because of the issues with intermediary banks. Please do not make further deposit as your wires may be rejected by intermediary banks. We are now actively looking for alternatives to resume deposit as soon as possible. Your current account balance remains unaffected. We are sorry for any inconvenience caused.
For this reason, we are weighting OKCoin Intl to 0 in the .BXBT Index, effective 20 April at 08:00 UTC. To re-distribute the index, GDAX will be reinstated as an equal member.
The new distribution will be equally weighted between GDAX and Bitstamp. For reference, this change is live on Testnet and can be used for intermediate pricing data.
Additionally, we will be announcing new price protection mechanisms for BitMEX indices to prevent further bad pricing issues.
Update: Due to rapid price divergence, the timetable has been moved forward to 19 Apr at 22:00 UTC.