Bitcoin futures open interest (active contracts not yet settled) totaled 676,820 BTC, valued at $52.64 billion, on Sept. 15, according to Bitcoin News as cited by PANews. Binance accounted for 142,870 BTC, worth $11.11 billion, or 21.1% of the total. In Bitcoin options, calls made up 305,530.06 BTC, or 61.39%, compared with 192,126.29 BTC, or 38.61%, for puts. The 25-delta skew, a measure of relative call-put pricing, turned positive on Aug. 20 for the first time in 12 months.