Crypto Liquidations Explained: How Collateral Gets Seized in CeFi and DeFi

Borrowing against crypto or trading with leverage can amplify gains, but it also introduces a mechanism that catches many newcomers off guard: liquidation. A liquidation is the forced sale of collateral when its value no longer adequately covers a loan or an open leveraged position. Unlike a traditional margin call, where a broker typically phones a client and gives them time to add funds, many crypto liquidations happen automatically and almost instantly, governed by code or exchange risk engines.

The core mechanic: collateralization ratios

Most crypto lending and leverage products require borrowers to post collateral worth more than what they borrow. This is expressed as a loan-to-value (LTV) ratio or its inverse, the collateralization ratio. For example, a protocol might require $150 of posted crypto for every $100 borrowed, an LTV of about 67%. If the collateral's market value drops — because the posted asset falls in price — the ratio moves against the borrower. Once it crosses a preset liquidation threshold, part or all of the collateral can be sold to repay the debt, regardless of whether the borrower is online or aware it is happening.

How DeFi liquidations work

On decentralized lending protocols such as Aave or Compound, loan terms and liquidation rules are written into public smart contracts. These contracts depend on price oracles — services that feed real-time asset prices onto the blockchain. When an oracle update shows a borrower's collateral ratio has breached the threshold, the position becomes eligible for liquidation. Critically, DeFi liquidations are usually open to the public: independent actors, often automated bots, race to repay part of the troubled loan in exchange for a slice of the borrower's collateral at a discount, known as a liquidation bonus or penalty, typically in the range disclosed in each protocol's own documentation. This competitive, permissionless design is meant to ensure liquidations happen quickly even without a central operator.

How CeFi and exchange liquidations work

Centralized exchanges and crypto lenders that offer margin trading or derivatives, such as perpetual futures, run their own internal risk engines rather than relying on public smart contracts. When a trader's margin balance falls below the exchange's maintenance margin requirement, the platform's matching engine can automatically close out the position, sometimes partially before reaching full liquidation. Exchanges typically disclose their specific maintenance margin levels, fee structures, and liquidation processes in their terms of service and help-center documentation, and these can vary significantly between platforms and products.

Why liquidations can cascade

Because crypto asset prices can move sharply in short periods, a single large price drop can trigger a wave of liquidations at once. Forced selling adds further downward pressure on price, which can push additional positions past their thresholds — a feedback loop sometimes called a liquidation cascade. Regulators, including the Commodity Futures Trading Commission, have flagged leverage and liquidation risk as a core feature of virtual currency derivatives trading that retail participants should understand before using borrowed funds or margin.

Key risks to understand

• Oracle risk: if a price feed is delayed, manipulated, or diverges from the broader market, it can trigger liquidations that do not reflect true market value.
• Liquidation penalties: both DeFi protocols and CeFi platforms typically charge a fee or spread on liquidated collateral, meaning borrowers recover less than the pre-liquidation value.
• Speed: many liquidations execute in seconds once triggered, leaving little or no time to add collateral or close a position manually.
• Volatility clustering: liquidations tend to concentrate during sharp market moves, which can worsen price swings across an entire asset class.

The bottom line

Liquidation is the mechanism that keeps crypto lending and leveraged trading solvent: it forces undercollateralized positions to close before losses can exceed the value of posted collateral. The core idea — sell collateral when it no longer sufficiently backs a debt — is similar across the industry, but the execution differs sharply between transparent, code-governed DeFi protocols and internally managed CeFi platforms. Anyone using borrowed funds or leverage in crypto markets should read the specific liquidation rules, fees, and oracle sources disclosed by the platform they use, since these details materially affect how much risk they are actually taking on.