Aave

Aave is a decentralized non-custodial liquidity protocol launched in 2020 on Ethereum, enabling users to supply supported ERC-20 assets to earn yield and borrow against over-collateralized positions. The protocol operates without a centralized intermediary — lending market parameters including interest rates, collateral factors, and supported asset listings are governed on-chain through AAVE token holder votes rather than by a centralized authority. Aave is maintained as open-source software with contract code publicly available on GitHub under the aave organization

Aave has expanded to operate across multiple EVM-compatible networks beyond Ethereum mainnet, including Arbitrum, Optimism, Polygon, Avalanche, and additional supported chains, deploying isolated lending market instances on each network. The AAVE governance token gives holders the ability to propose, discuss, and vote on Aave Improvement Proposals (AIPs) that determine protocol parameters, supported asset listings, and structural changes across all deployments. Protocol governance activity is coordinated through the governance forum at governance.aave.com, where community discussion precedes formal on-chain voting

The primary actions on Aave are supply and borrow. Suppliers deposit a supported ERC-20 token into an Aave lending pool and receive an aToken in return — an interest-bearing ERC-20 token that represents the supplier's share of the pool and automatically accumulates yield as the market is borrowed against. The interest rate paid to suppliers is drawn from the borrowing fees collected from active borrowers in each market, with rates adjusting continuously based on the pool's current utilization ratio

Borrowers on Aave open positions by posting collateral assets above the required loan-to-value ratio for each supported collateral type, then drawing a loan against that collateral. Each collateral asset is assigned a specific collateral factor — set through governance — that determines the maximum fraction of its deposited value available for borrowing. Accounts where the borrowed value approaches or exceeds the liquidation threshold for their collateral become eligible for on-chain liquidation by external actors, who receive a portion of the collateral as a liquidation incentive defined by the protocol

Aave's interest rate model calculates supply and borrow rates for each market based on the pool's current utilization rate — the proportion of the total supplied pool that has been borrowed at a given time. When utilization is low, rates are kept subdued to encourage borrowing activity and increase market efficiency. When utilization is high, rates rise to attract new suppliers and prompt borrowers to reduce exposure, balancing supply and demand algorithmically without manual rate intervention. Both variable and, where configured, stable rate borrowing options may be offered depending on the market parameters set through protocol governance

Overcollateralized lending is the foundational safety mechanism of the Aave protocol, requiring borrowers to deposit collateral with a value exceeding the loan amount by a protocol-defined margin. Each supported collateral asset carries a defined collateral factor — for example, a factor of 0.75 means 75% of the asset value may be borrowed against — and a separate liquidation threshold at which an account becomes eligible for liquidation. When an account's health factor drops below 1.0 due to collateral value decline or accrued interest, external liquidators can repay part of the debt and receive a corresponding portion of collateral plus a protocol-defined liquidation bonus

Aave's multi-chain deployment strategy extends lending market functionality across EVM-compatible networks by deploying isolated instances of the protocol on each supported chain. Each chain deployment operates independently, with its own set of supported collateral assets, risk parameters, and governance-approved configurations tailored to the liquidity conditions of that network. This model allows users on Arbitrum, Optimism, Polygon, and other supported networks to access Aave lending markets using assets native to those chains without bridging capital to Ethereum mainnet

AAVE governance operates through a proposal-and-vote process where AAVE token holders submit Aave Improvement Proposals covering risk parameter changes, supported asset listings, cross-chain deployments, and protocol contract upgrades. Proposals are discussed on the governance forum at governance.aave.com before being submitted for formal on-chain voting, where the result is executed through a timelock contract that delays implementation and allows the community to respond if a proposal outcome is contested. This structure ensures that changes to protocol parameters are publicly auditable and subject to token-weighted community approval before taking effect

Aave supports a range of DeFi and on-chain lending use cases across its deployed networks: ERC-20 token holders supply idle assets to Aave markets to earn variable interest without permanently surrendering custody; traders and DeFi protocol integrators borrow against collateral they intend to hold — for example, borrowing USDC or USDT against WETH to access stablecoin liquidity while maintaining ETH price exposure; leveraged yield strategies use Aave's supply-and-borrow mechanics to amplify positions on supported assets within the limits of the collateral factor; DeFi developers integrate Aave lending pools into protocol-level liquidity flows using the aToken interface or direct contract calls to supply and withdraw programmatically; and AAVE token holders participate in governance to shape risk parameters, new asset listings, and protocol structure across all supported chain deployments

Developer integration with Aave is supported through the protocol documentation at aave.com/docs and the open-source smart contract repositories available on GitHub under the aave organization. The Aave contracts expose a defined interface for supplying assets, borrowing against collateral, repaying debt, and withdrawing supplied capital — interactions that external protocols and applications can execute on-chain using the published contract ABIs and deployment addresses for each supported network. Developers building applications that consume Aave lending rates, pool utilization data, or on-chain position health metrics can query the Aave protocol directly through its on-chain view functions without depending on a centralized off-chain data endpoint

Aave maintains a security page at aave.com/security that lists published audit reports covering the protocol's smart contracts across versions and deployments. An active bug bounty program is operated through Immunefi at immunefi.com/bug-bounty/aave/information, providing a structured and incentivized path for external security researchers to disclose vulnerabilities responsibly. All Aave smart contracts are open-source and independently auditable on GitHub under the aave organization. As a non-custodial protocol, Aave does not hold user funds between transactions — all supply, borrow, and repay operations execute through smart contract calls with no centralized party controlling liquidity between user interactions

Aave is an established decentralized lending protocol providing open-source infrastructure for over-collateralized lending and borrowing across Ethereum and multiple EVM-compatible networks since 2020. The protocol's algorithmic interest rate model, on-chain AAVE governance, multi-chain deployments, published security audits, and active bug bounty program give developers and users structured resources for assessing the protocol's risk model and integration requirements. Teams and users evaluating Aave should review the documentation at aave.com/docs, the security page at aave.com/security, and the governance forum to understand supported assets, collateral parameters, and network coverage before supplying or borrowing through the platform