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Over-Collateralization

In simple terms

Over-collateralisation means you must lock up more value than you borrow. It exists because the protocol has no way to check your identity or chase you for repayment, so the collateral is its only recourse.

Definition

Requiring collateral worth more than the amount borrowed, which is the standard model in on-chain lending.

In depth

Because on-chain lending is generally pseudonymous and non-recourse, credit risk is managed entirely through excess collateral and rapid liquidation rather than through underwriting. The required ratio reflects expected volatility, liquidity depth and oracle latency: the buffer must survive a price move over the time it takes to liquidate. This is why the model is capital-inefficient by construction, and why under-collateralised on-chain lending remains an unsolved problem outside of trusted or identity-bound arrangements.

How does Over-Collateralization work?

A protocol sets a maximum loan-to-value per asset and a liquidation threshold slightly above it, leaving a buffer. A borrower can draw up to the maximum, and the gap between the two levels is the room the position has before liquidators can act. More volatile collateral gets a lower ratio, so borrowing against it locks up proportionally more capital.

An example

Borrowing an illustrative $5,000 against ETH at a 75 percent limit requires at least $6,667 of collateral, and a prudent borrower deposits considerably more — $12,000 or $15,000 — so that an ordinary drawdown does not reach the threshold.

Figures are illustrative only.

What beginners get wrong

  • Seeing the requirement as a fee. The collateral is still yours and is returned on repayment.
  • Believing a stablecoin loan is a safe way to hold exposure. The collateral remains volatile and the position can still be liquidated.
  • Treating the maximum ratio as a target rather than a ceiling.

Related terms

Part of

What is DeFi, and how does decentralized finance work? — the subject page for defi, with all 18 of its definitions in one place.

Educational only — not financial advice.