A combination of falling price and rising open interest is said to signal bearish conviction on the part of bitcoin futures traders.
The exchange is giving traders another way to bet on bitcoin.
Derivatives' role in bitcoin's rally is "muted" this time, said one trader.
The disclosure comes shortly after U.S regulators' crackdown on retail competitor BitMEX.
When BitMEX announced its "perpetual bitcoin leveraged swap" four years ago, few traders could have anticipated the major impact it would have on the digital-asset trading landscape.
Tassat blamed COVID-19 and leadership changes for its long-delayed bitcoin derivatives contract listing.