I have used my BTC as collateral on a bigger plattform for a 7.5% USDT P2P loan, max 80% LTV.
Not the best rate, there are SOMETIMES better options like AAVE, but I don't need to wrap it up and it's easy to deal with, repay - renew - without any transaction costs, and the rate is fixed for 30 / 90 / 180 days. And I am making >40% with that capital, so the borrow interest rate doesn't really matter so much in the end, as long as it's below 20%.
Thorchain looks very interesting, but it's all loaned out, and I haven't seen︀ any opportunity to take part.
Honestly, I have been eying hodlhodl for years now, but︁ my gut feeling is telling me to stay away.
But they still exists, so I︂ have been wrong about it until now. But who'd I trust but my gut?