Aave (AAVE)

What Aave is

Aave is a decentralized, non-custodial lending protocol. Users supply assets to shared liquidity and earn interest; other users lock collateral and borrow against it. The AAVE token is the protocol's governance asset, an ERC-20 on Ethereum that lets holders vote on how the protocol runs (source: Aave documentation, September 2026). Aave also issues its own over-collateralized stablecoin, GHO.

Nobody at Aave takes custody of your assets. Everything runs through permissionless smart contracts that enforce collateral requirements and interest rates automatically, and users interact from their own wallet.

How it works

Lending on Aave is over-collateralized. Because there are no credit scores on-chain, a borrower must lock assets worth more than what they borrow. That protects suppliers and keeps the protocol solvent when collateral prices fall.

When you supply an asset you receive an aToken in return, minted on supply and burned on withdrawal, which accrues interest in your wallet. Interest rates move with utilization, the share of an asset's liquidity currently borrowed. Aave uses a curve with a kink at a target utilization: below it, borrow rates rise gently; above it, they rise sharply to protect remaining liquidity. Supplier rates are funded by borrower interest and rise with utilization too.

Positions are tracked by a health factor, calculated as eligible collateral value divided by debt value. It must stay above 1. It falls as interest accrues, as collateral prices drop, or as new debt is taken. Below 1, a liquidation can occur: a liquidator repays part of the debt and receives collateral plus a bonus.

Aave v3 is the version in wide use. Aave v4 restructures this into a Hub and Spoke model. A Liquidity Hub consolidates protocol-wide liquidity and accounting and grants each Spoke a credit line for borrowing and a debit line for supplying. Spokes are modules handling particular assets, use cases or risk profiles, with their own parameters, oracle interactions and emergency stops. Governance can add markets without migrating liquidity.

The v4 liquidation engine is redesigned. Instead of a fixed close factor, liquidators repay only enough to restore a position to a target health factor set per Spoke, which prevents over-liquidation. The liquidation bonus scales with how unhealthy the position is, creating a Dutch-auction-style incentive to hit the riskiest positions first. If the remaining debt or collateral after liquidation would fall below $1,000, the liquidator must clear the position entirely.

GHO is minted on demand by users, subject to caps set by governance, and operates through a facilitator model. Facilitators are contracts approved by Aave governance that can mint and burn GHO up to a bucket capacity. Savings GHO, an ERC-4626 vault on Ethereum mainnet, is the savings product built on top of it.

Protocol safety is handled by Umbrella, which replaced the older Safety Module. Users stake aTokens such as aUSDC, aUSDT and aWETH, or GHO, and earn incentives. If a deficit appears in a given asset, the corresponding staked assets can be burned to cover it automatically, without a governance vote. Deficit offsets provide first-loss protection: the documentation gives the example of a 100,000 USDT offset absorbed by the Aave DAO before any staker is touched.

Supply and tokenomics

AAVE's function is governance. AAVE, staked AAVE and aAAVE holders on Ethereum mainnet can vote on proposals or delegate their voting power. Staking AAVE in the safety system earns rewards and can grant reduced GHO borrowing rates.

The DAO runs a buyback program using protocol revenue. Purchases are adjusted for market conditions and liquidity, and are executed by the Aave Finance Committee, a multisig comprising Chaos Labs, TokenLogic, LlamaRisk and ACI.

An important detail: bought-back tokens are not burned. They go to the Aave DAO Ecosystem Reserve and are spent through governance-approved programs such as staking rewards, grants and service-provider payments. The budget itself can be changed by a governance vote.

AAVE has canonical deployments on Ethereum, Arbitrum, Base, Optimism and Polygon, bridged using each network's own messaging infrastructure.

History

Aave grew into one of the largest lending protocols in decentralized finance, expanding from a single Ethereum market to deployments across many networks. Its governance moved on-chain through Aave Governance v3, built by BGD Labs, which separates the Core Network on Ethereum mainnet, where voting power lives, from Voting Networks such as Polygon POS and Avalanche C-Chain, where votes are cast cheaply using storage proofs, and Execution Networks where approved payloads run.

The proposal lifecycle reflects that maturity: discussion on the governance forum, a non-binding Temp Check on Snapshot, an Aave Request for Final Comments, then a formal Aave Improvement Proposal voted on-chain, followed by execution behind a one-day or seven-day timelock.

Aavenomics in 2024 added the buyback program, GHO grew into a full stablecoin with a savings vault, and Umbrella replaced the Safety Module with automated bad-debt coverage.

Risks and what to watch

Smart contract risk is inherent. Aave is heavily audited and formally verified in parts, but a lending protocol holding billions across many chains is a permanent target, and v4 introduces new architecture that has less battle-testing than v3.

Oracle risk is the sharpest operational risk. Every collateral valuation depends on a price feed. A manipulated or stale feed can trigger wrongful liquidations or leave the protocol with bad debt.

Liquidation risk is the borrower's own. A health factor above 1 today can fall below it in minutes during volatility. Aave's v4 changes reduce over-liquidation but do not remove liquidation.

Staking in Umbrella means accepting slashing risk. Staked aTokens can be burned to cover a deficit in the specific asset and network you staked. The offsets reduce the odds; they do not eliminate them.

Finally, governance is a real dependency. Mint caps, risk parameters, the buyback budget and the treasury are all decided by token holders and executed by multisigs. Concentrated voting power is worth watching.

Frequently asked questions

What is an aToken?

The receipt you get for supplying an asset to Aave. It is minted when you supply, burned when you withdraw, and accrues interest in your wallet balance.

What happens if my health factor falls below 1?

Your position becomes eligible for liquidation. A liquidator repays part of your debt and receives collateral plus a bonus. In Aave v4 they repay only enough to restore a target health factor, rather than a fixed share.

Are AAVE buybacks the same as burning?

No. The DAO buys AAVE with protocol revenue and sends it to the Ecosystem Reserve, where governance spends it on staking rewards, grants and service providers. Supply is not destroyed.

What is GHO?

Aave's own decentralized, over-collateralized stablecoin, minted by users against Aave collateral and controlled through governance-approved facilitators with mint caps.

Where can I buy Aave?

AAVE is listed widely across centralized venues and trades on decentralized exchanges. See where to buy Aave for availability in your jurisdiction, and Exchanges for how those venues compare.