Can anyone recommend a good exchange to buy leveraged bitcoin?  I do not mean margin trading.  I do not want want to borrow money to buy more bitcoin and have to pay interest and worry about a cut off price (eg. BTC drops to less then 50% of your trade its auto-sold).  I want leverage.  Like a 3X ETF, it can goto to $1 and I'll still hold my position and pay no interest.  Broke, yes, obviously.

Any recommendations?