Changes with BTC price, but fixed once operation set.
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“The BTC2X is a token for traders wishing to go 2x long in the price of bitcoin. The traders pay interest for those long positions, and that interest goes to the BitPro.”
BPro Token explained
The BTCx is a BTC/USD instrument that is settled in Bitcoin. Currently you can do a 2 leveraged long operation on the price of BTC. In the future the protocol will include up to 20X leveraged, long and short positions.