Right now Starknet is the cheapest place to borrow against your BTC thanks to the subsidies from their BTCFi campaign (only 0,5% borrow rate). 1. You can start by staking your BTC and earn staking yield. Then use the BTC as collateral (several types, eg. WBTC/LBTC/tBTC, solvBTC), and you can deposit it at on Vesu (2% supply APR), and borrow USDC against it (0,5% borrow rate). Personally can't remember seeing a borrow rate this low ever. So you borrow at a cheap rate, get paid for staking, meaning you can actually end up with a surplus 2. Further you can for example deposit the USDC you borrow into the Extended vault with 15% APR. 3. Extended just launched their Tokenised Vault Shares (XVS) which basically is a reciept that you deposited into their vault, and with this reciept you can use it as margin for trading on Extended. In a way it reminds me of USDe and its use for trading on Bybit, HyENA etc. Effectively you're earning 15% on the USDC from your BTC collateral + 2% from staking + you earn Extended points + you have the potential to earn from trading on Extended or you could safe it even more with doing delta neutral between Extended and eg. Lighter/Paradex.(Route 2 FI)