Aave V3 and Compound III both use oracle-priced collateral, but their liquidation designs differ. Aave tracks a borrowing position with a Health Factor and documents a PriceOracleSentinel that can gate borrowing and liquidation during certain oracle or Layer 2 sequencer interruptions. Compound III uses separate borrow and liquidation collateral factors; when an account crosses its liquidation limit, the protocol absorbs it and uses reserves to pay its debt. Neither design is categorically safer: the outcome depends on the configured feed, chain, market parameters, liquidity, reserves, governance and execution conditions.
How the designs compare
| Risk question | Aave V3 | Compound III |
|---|---|---|
| How prices are configured | Each reserve has an oracle, with the source selected through Aave Governance. The docs name Chainlink Price Feeds and CAPO among production oracle types. Aave oracle documentation | Governance can configure a base-token feed and update asset feeds. The docs do not establish one universal provider or feed setup. Compound governance documentation |
| How borrowing capacity is measured | Position-level Health Factor reflects oracle-priced collateral, debt and accrued interest, with reserve-specific LTV and liquidation-threshold settings. Aave V3 overview | Each collateral asset has a borrow collateral factor that limits how much base asset can be borrowed against its value. Compound collateral and borrowing documentation |
| When liquidation becomes possible | When the Health Factor falls below 1. Aave V3 overview | When the account exceeds the allowed limit under liquidation collateral factors, which are distinct from and higher than borrow collateral factors. Compound liquidation documentation |
| What liquidation does | A liquidator repays part of the debt and receives collateral with a reserve-defined liquidation bonus. Aave V3 overview | A liquidator calls absorb; the protocol takes the collateral and pays the debt from base-asset reserves. When reserve conditions permit, liquidators can buy protocol-held collateral at a feed-based discount. Compound liquidation documentation |
| Documented outage control | The PriceOracleSentinel can disable borrowing and liquidation during specified oracle downtime and a post-recovery grace period, with particular relevance to L2 sequencer interruptions. Aave oracle contract reference | The reviewed documentation describes configurable feeds and pause controls, but not a directly equivalent oracle/sequencer grace-period sentinel. This does not establish that no other operational safeguards exist. Compound governance documentation |
How Aave V3 handles oracle and liquidation risk
Oracle selection is reserve-specific
Aave’s documentation says each reserve uses an oracle contract to report market prices and that Aave Governance selects the source. How and when a price updates depends on that source: the documentation notes that updates may be time-based, deviation-based or determined in another way. It identifies Chainlink Price Feeds and the Correlated Assets Price Oracle (CAPO) as two primary oracle types on production Aave markets. CAPO is intended for strongly correlated assets, such as wrapped tokens whose value follows an underlying asset. Aave oracle documentation
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The Health Factor connects collateral to liquidation eligibility
Users supply collateral to borrow, and the position’s Health Factor changes as oracle-valued collateral, debt and accrued interest change. Below 1, the position is eligible for liquidation: an external liquidator may repay part of the debt and receive collateral at a discount. The liquidation threshold and bonus are defined for each reserve. Aave V3 overview
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The sentinel addresses a specific outage scenario
Aave’s PriceOracleSentinel can disallow borrowing and liquidation when the price oracle is down or during a grace period after recovery. The feature is designed especially for L2 sequencer downtime: after service resumes, the grace period gives users time to make positions healthy before liquidations are allowed again. It is an operational safeguard for these conditions, not a guarantee against an incorrect price from a feed. Aave oracle contract reference
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Aave also documents isolation mode, supply and borrow caps, risk-admin roles and oracle controls as parts of V3’s risk-control framework. Its risk documentation warns that a third-party oracle failure or compromise can result in incorrect valuations, while volatile or illiquid collateral can contribute to undercollateralization or bad debt. LTV limits and liquidation thresholds are mitigations monitored by risk service providers and subject to governance adjustment. Aave V3 governance introduction · Aave risk documentation
How Compound III handles oracle and liquidation risk
Borrow and liquidation factors serve different purposes
In a Compound III market, users supply supported crypto assets as collateral to borrow that market’s base asset. The documentation describes Ethereum with USDC as the initial deployment; that description should not be taken as the configuration of every current market. Compound III overview
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A collateral asset’s borrow collateral factor limits the share of its USD value that supports borrowing the base asset. Falling outside the borrowing collateralization check does not by itself mean that an account is already liquidatable. A separate, higher liquidation collateral factor sets the limit used to determine when the account can be liquidated, creating a buffer between borrowing capacity and liquidation eligibility. Compound collateral and borrowing documentation · Compound liquidation documentation
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Absorption uses protocol reserves before collateral sales
When an account exceeds its allowed limit under liquidation factors, a liquidator can call absorb. The account’s collateral transfers to protocol ownership, and the debt is paid from the protocol’s base-asset cash reserves. If reserves fall below a target set through governance, liquidators can buy the protocol-held collateral at a discount based on the price feed; those sales increase base-asset reserves. Compound liquidation documentation
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Governance controls feeds and risk parameters
Compound governance operates through proposals and execution, with the Timelock controlling protocol contracts. The documented admin functions include setting the base-token price feed, updating an asset feed, changing borrow and liquidation collateral factors, and pausing selected functions. These controls establish configurability, not a specific feed provider for every deployment. Compound governance documentation
What happens when a DeFi oracle goes down?
“Oracle failure” can mean different things: a price may be wrong, stale or unavailable, or a chain’s sequencer may be interrupted. Those conditions are not interchangeable. Aave documents a sentinel that gates borrowing and liquidation for specified oracle-downtime and recovery conditions, especially around L2 sequencer interruptions. The reviewed Compound III materials document feed configuration and pause controls, but do not describe a directly equivalent grace-period sentinel. That documentation difference alone does not show that one protocol prevents every oracle error or that the other lacks all operational safeguards.
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Even a correctly functioning feed cannot remove the risks of a sharp collateral move, thin market liquidity, inadequate reserves, delayed execution, governance changes or smart-contract failure. Aave explicitly discusses oracle and collateral risks; Compound’s documented absorption path depends on protocol reserves, and its governance can change feeds and risk parameters. Aave risk documentation · Compound liquidation documentation · Compound governance documentation
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The documented architecture supports a distinction, not a safety ranking. Aave makes position health explicit through a Health Factor and documents a special outage and recovery gate. Compound III makes the separation between borrowing capacity and liquidation eligibility explicit through two collateral factors, then uses protocol absorption and reserves to process underwater accounts. These mechanisms do not establish comparative liquidation performance or overall safety.
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A live comparison requires a matched, specific network and market. Check the assets, feed contracts, collateral and liquidation parameters, Aave liquidation bonuses where applicable, Compound reserve state, and relevant governance configuration; record when the information was retrieved. The documentation reviewed here does not verify current feed addresses or numerical settings for a matched market pair, and those settings can vary by deployment and change over time. Aave oracle documentation · Compound governance documentation
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