Margin Call
A notification from a lending platform that your collateral has dropped below the required level. In crypto, margin calls typically come as on-chain alerts or email warnings before liquidation.
You borrowed against your crypto, the market dropped, and now the platform wants more collateral — fast. That's a margin call. It's not a punishment; it's a mechanical trigger that fires when the ratio of your loan to your collateral climbs too high for the platform's comfort.
The lender's entire business model depends on your collateral covering the loan if you default. A margin call is the early warning system — the gap between "we're watching you" and "we're liquidating you."
How It Works
Every crypto loan has a loan-to-value ratio, or LTV — the loan amount divided by the collateral value. Say you deposit $10,000 in ETH and borrow $6,000 in USDC. Your starting LTV is 60%. The platform sets a margin call threshold — often around 75-80% LTV — and a liquidation threshold just above that.
If ETH drops and your collateral value falls to $8,000, your LTV is now 75%. That triggers the margin call. You get an alert — email, on-chain notification, or both — telling you to either add more collateral or repay part of the loan to bring LTV back down.
If you don't act, the platform doesn't wait. Once LTV hits the liquidation threshold, automated smart contracts (in DeFi) or platform systems (in CeFi) start selling your collateral to cover the loan. The margin call is your window. Miss it, and the decision gets made for you.
Why It Matters
In traditional lending, a margin call on a brokerage account might give you a few days to respond. Your broker calls. You talk. You work something out. Crypto doesn't work that way — especially in DeFi, where the smart contract has no phone number and no interest in your situation.
What is DeFi?
Decentralized Finance — financial services built on blockchain smart contracts that operate without intermediaries. DeFi lending allows users to lend and borrow directly through protocols rather than banks.
Full glossary entryBill's Take
In 25 years of mortgage and capital markets lending, I watched borrowers lose collateral in margin situations — but they usually had time to react. In crypto, a flash crash can move your LTV from safe to liquidated in minutes. The system is ruthlessly efficient. That efficiency is the feature, not the bug, but it demands a different kind of vigilance from borrowers.
What to Watch
The most common mistake is treating the margin call threshold as the danger line. It isn't. The liquidation threshold is the danger line. The margin call is just the last warning before you hit it. Borrowers who wait for the alert and then take hours to respond often find they've already been liquidated by the time they log in.
The Window Is Shorter Than You Think
Crypto markets don't sleep. A margin call at 2 a.m. on a Sunday is entirely possible — and not unusual during high-volatility periods. If you're carrying a crypto-backed loan, know your platform's exact thresholds, set your own price alerts below the margin call level, and keep dry powder ready to add collateral on short notice. Don't rely on the platform's notification as your only signal.
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