Borrow $5,000 against ETH at 50% LTV
Inputs: loan $5,000, ETH price $3,200, target LTV 50%, liquidation LTV 80%.
Steps: required collateral = $5,000 / 0.50 = $10,000. ETH units = $10,000 / $3,200 = 3.125 ETH. Liquidation price = $3,200 x 0.50 / 0.80 = $2,000.
Interpretation: the ETH position can absorb a 37.5% price drop before reaching the 80% liquidation LTV, before interest or fees.
Borrow $10,000 against BTC with an 80% threshold
Inputs: loan $10,000, BTC price $100,000, target LTV 40%, liquidation LTV 80%.
Steps: required collateral = $10,000 / 0.40 = $25,000. BTC units = $25,000 / $100,000 = 0.25 BTC. Liquidation price = $100,000 x 0.40 / 0.80 = $50,000.
Interpretation: starting at half the liquidation threshold gives a 50% price-drop buffer, but interest would slowly reduce that buffer.
Use stablecoin collateral
Inputs: USDC collateral $12,000, target LTV 70%, liquidation LTV 90%.
Steps: maximum loan = $12,000 x 0.70 = $8,400. Health factor = $12,000 x 0.90 / $8,400 = 1.29.
Interpretation: stablecoin collateral has less price volatility, but depeg and platform risk still matter. Avoid assuming the price can never move.