Dollar on Chain (DOC) by Money on Chain colateralized by RBTC, which is pegged 1:1 to BTC over the Bitcoin sidechain RSK.
The BTC volatility extracted when issuing DoC goes to BPRO, which retains a small leveraged position on BTC and transfers, for a small fee, the majority of that volatility to BTCx, a higher leveraged (around 2x) position on BTC.