Bakkt only? No! 10 exchanges has been regulated and get access to trade full-regulated BTC-based derivatives (futures, but day ahead swap at LedgerX, forwards at TeraExchange).
Kraken Futures (ex. CryptoFacilities) represent other products - ETH, LTC, XRP and BCH futures contracts.
Most of all exchange regulated under US law, two licensed at UK (CryptoFacilities and LDX - London Derivative Exchange) and one at UAE (Dubai-based BTSE exchange).
24h Total volume: ~
190M USD, Open interes: ~
110M USD.
Data availability is a pain questions at now - only CryptoFacilities and BTSE have a public API, LedgerX has limited data reports (but BTSE dont published open interes metrics). Now we are discussed with other exchanges to access it's data API.

This is actually a really cool service!
If I may ask, do you guys have a plan to combat potential fraud in these stats?
Not all exchanges are on the up and up, and once leverage gets involved, it would be easy for exchanges to report huge (and fake) volume.
I look forward to you guys getting a publicly accessible API set up.