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Total BTC:USD Futures Exchange Volume Market Share Rolling hour OKex. Contract / Type, Symbol, Price, Premium, Volume, Open Interest. (last), (index). OKEx futures contract is a derivative launched by OKEx to trade contracts of digital assets such as BTC and LTC. Each contract represents. USD Contract. Futures weekly. Select custom. 1m5m1h1d. BTC Perpetual swap funding rate. Period. 5m1h1d. BTC Futures open interest and volume. Period.