Crypto lending lets you borrow money, usually a stablecoin, by putting your crypto up as collateral instead of selling it, which means you keep your position and avoid triggering a taxable sale. The catch is what happens if your collateral drops in value: once your "health factor," the ratio between your collateral's discounted value and what you owe, falls below 1.0, the lending protocol automatically sells enough of your collateral to repay the loan and charges you a liquidation penalty on top, typically 5% to 15% of the amount liquidated. This happens instantly and automatically, with no phone call, no grace period beyond what the math already built in, and no way to stop it once the price has moved.
How Does Crypto-Backed Borrowing Actually Work?
You deposit crypto, usually Bitcoin, Ethereum, or a liquid staking token like staked ETH, into a lending platform as collateral, and the platform lets you borrow up to a set percentage of that collateral's value, called the loan-to-value ratio. On a major platform like Aave, ETH typically has an LTV in the 70% to 80% range, meaning $10,000 of ETH might let you borrow up to $7,000 to $8,000. You can do this through a decentralized protocol like Aave or Compound, where smart contracts hold your collateral directly, or through a centralized platform where a company custodies the crypto for you, the same basic trade as a securities-backed line of credit, just collateralized with a far more volatile asset and, on the DeFi side, run entirely by code instead of a bank's risk desk.
What Is a Health Factor, and Why Does It Decide Whether You Get Liquidated?
Your health factor is a single number, calculated as your collateral's value times its liquidation threshold, divided by what you currently owe, and it needs to stay above 1.0 or your position becomes eligible for automatic liquidation. The liquidation threshold is a separate, slightly higher percentage than your borrowing limit, usually 5 to 15 percentage points above the LTV, which is meant to act as a buffer, though in practice that buffer can close fast in a volatile market. Say you deposit $10,000 in ETH, which has an 80% liquidation threshold, and borrow $6,000 in a stablecoin. Your starting health factor is (10,000 × 0.80) ÷ 6,000 = 1.33. If ETH drops 20% to $8,000, your health factor falls to (8,000 × 0.80) ÷ 6,000 = 1.07, still technically solvent but with almost no room left. A further drop to $6,700, a roughly 33% decline from where you started, pushes the health factor under 1.0 and triggers liquidation.
What Actually Happens the Moment You Get Liquidated?
Independent participants called liquidators, or in some cases the protocol itself, repay part or all of your outstanding loan and take your collateral in exchange at a discount, which is their financial incentive to act the instant your health factor crosses the line. You lose a chunk of your collateral to cover the debt plus the liquidation penalty, and whatever's left, if anything, remains yours, but the position you were holding is gone, sold at whatever price the market happened to be at during a downturn, not a price you chose. There's no negotiation and no partial warning built into the system beyond your own responsibility to monitor the health factor yourself; most platforms show it on a dashboard, and some offer optional alerts, but nothing stops the liquidation once the threshold is crossed.
A Real Example: The Aave Oracle Glitch That Liquidated $27 Million
On March 10, 2026, roughly $27 million in borrower positions on Aave, the largest DeFi lending protocol, got liquidated after a configuration error in Aave's price oracle briefly undervalued a staked ETH token called wstETH by about 2.85%. That small, technically incorrect price drop was enough to push roughly 10,900 leveraged positions below their liquidation threshold, even though the real market price of the underlying asset hadn't actually moved that much. About 34 accounts were affected, and Aave and the Lido protocol behind wstETH later committed to reimbursing the users who lost money. The event is a useful case study precisely because nothing "went wrong" with the borrowers' judgment. Their collateral got liquidated because of a bug in the software the entire system depends on to read prices correctly, a risk that has nothing to do with how conservatively you borrowed.
What Are the Real Risks Beyond a Straightforward Price Drop?
- The liquidation penalty is a real cost, not just a warning. Losing 5% to 15% of the liquidated amount on top of the collateral itself means a liquidation is meaningfully worse than simply having sold at the low point yourself.
- Oracle and smart contract risk is real, as the Aave event shows. Your liquidation risk isn't purely a function of the market price of your collateral, it's also a function of whether the software correctly reports that price, and bugs happen even on well-audited, market-leading platforms.
- Liquidations cascade in a real crash. A sharp market drop can trigger a wave of liquidations at once, which forces more selling into an already falling market and can push prices down further, worsening the exact conditions that caused the liquidations in the first place.
- None of this is FDIC- or SIPC-insured. A margin call from a traditional broker comes with regulatory protections and, usually, more notice. A DeFi liquidation is enforced entirely by code with no regulator standing behind it if something goes wrong.
- CeFi lending platforms carry their own counterparty risk on top of market risk. A centralized lender can freeze withdrawals or become insolvent independent of what your collateral is doing, which is a different failure mode than a DeFi smart contract but no less real.
Is Borrowing Against Your Crypto Ever a Reasonable Move?
It can make sense if you have a genuine need for cash, want to avoid selling an appreciated position and triggering a capital gains tax bill, and are borrowing conservatively enough that a realistic price swing, not just a mild one, won't put you anywhere near your liquidation threshold. It stops making sense the moment it's used to lever up and buy more crypto with the borrowed funds, which is exactly the trade that turned a 2.85% oracle error into a liquidation event for thousands of positions at once. The safer version of this trade means borrowing well under your maximum LTV, leaving real room before your liquidation threshold, and treating the loan like a cash-flow tool, not a way to increase your market exposure.
If you're weighing where to actually hold crypto in the first place, our breakdown of what happens to your crypto if the exchange goes bankrupt covers the custody risk that sits underneath any of this, and our look at whether the wash sale rule applies to crypto covers the other side of the tax question, what happens when you do decide to sell.
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Spicy Investing