OKCoin's BTCUSD Weekly futures: https://cryptowat.ch/okcoin/btcusd-weekly-futures/6h
OKCoin's BTCUSD https://cryptowat.ch/okcoin/btccny
In light of dropping volume at Chinese exchanges after the ban on margin trading that forced exchanges to instate fees.
How are the Futures allowed to zero-fee trade while regular BTCCNY has fees now.
Wouldn't that make the Futures market the 'market maker'?