Pool

This contract is the main user-facing contract. Most user interactions with the Aave Protocol occur via the Pool contract. It exposes the liquidity management methods that can be invoked using either Solidity or Web3 libraries.

Pool.sol allows users to:

  • Supply

  • Withdraw

  • Borrow

  • Repay

  • Enable/disable supplied assets as collateral

  • Liquidate positions

  • Execute Flash Loans

Pool is covered by a proxy contract and is owned by the PoolAddressesProvider of the specific market. All admin functions are callable by the PoolConfigurator contract defined in the PoolAddressesProvider.

The source code is available on GitHub.

Write Methods

initialize

function initialize(IPoolAddressesProvider provider) external virtual

Initializes the Pool.

Function is invoked by the proxy contract when the Pool contract is added to the PoolAddressesProvider of the market.

Caches the address of the PoolAddressesProvider in order to reduce gas consumption on subsequent operations.

Input Parameters:

NameTypeDescription
provideraddressThe address of the PoolAddressesProvider

supply

function supply(    address asset,    uint256 amount,    address onBehalfOf,    uint16 referralCode) public virtual override

Supplies a certain amount of an asset into the protocol, minting the same amount of corresponding aTokens and transferring them to the onBehalfOf address. For example, if a user supplies 100 USDC and onBehalfOf address is the same as msg.sender, they will get 100 aUSDC in return.

The referralCode is emitted in Supply event and can be for third-party referral integrations. To activate the referral feature and obtain a unique referral code, integrators need to submit a proposal to Aave Governance.

When supplying, the Pool contract must have allowance() to spend funds on behalf of msg.sender for at least the amount for the asset being supplied. This can be done via the standard ERC20 approve() method on the underlying token contract.

Referral supply is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset being supplied to the pool
amountuint256The amount of asset to be supplied
onBehalfOfaddressThe address that will receive the corresponding aTokens. This is the only address that will be able to withdraw the asset from the pool. This will be the same as msg.sender if the user wants to receive aTokens into their own wallet, or use a different address if the beneficiary of aTokens is a different wallet
referralCodeuint16Referral supply is currently inactive, you can pass 0. This code is used to register the integrator originating the operation, for potential rewards. 0 if the action is executed directly by the user, without any middle-men

supplyWithPermit

function supplyWithPermit(    address asset,    uint256 amount,    address onBehalfOf,    uint16 referralCode,    uint256 deadline,    uint8 permitV,    bytes32 permitR,    bytes32 permitS) public virtual override

Supply with transfer approval of the asset to be supplied via permit function. This method removes the need for separate approval tx before supplying asset to the pool. See: https://eips.ethereum.org/EIPS/eip-2612.

Permit signature must be signed by msg.sender with spender as Pool address.

Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal.

Input Parameters:

NameTypeDescription
assetaddressThe address of underlying asset being supplied. The same asset as used in permit v, s, and r
amountuint256The amount of asset to be supplied and signed for approval. The same amount as used in permit v, s, and r
onBehalfOfaddressThe address that will receive the aTokens. This will be the same as msg.sender if the user wants to receive aTokens into their own wallet, or use a different address if the beneficiary of aTokens is a different wallet
referralCodeuint16Referral supply is currently inactive, you can pass 0. This code is used to register the integrator originating the operation, for potential rewards. 0 if the action is executed directly by the user, without any middle-men
deadlineuint256The unix timestamp up until which the permit signature is valid
permitVuint8The v parameter of the ERC712 permit signature
permitRbytes32The r parameter of the ERC712 permit signature
permitSbytes32The s parameter of the ERC712 permit signature

withdraw

function withdraw(address asset, uint256 amount, address to) public virtual override returns (uint256)

Withdraws an amount of underlying asset from the reserve, burning the equivalent aTokens owned. For example, if a user has 100 aUSDC and calls withdraw(), they will receive 100 USDC, burning the 100 aUSDC.

If user has any existing debt backed by the underlying token, then the maximum amount available to withdraw is the amount that will not leave user's health factor < 1 after withdrawal.

When withdrawing to another address, msg.sender should have aToken that will be burned by Pool.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset to withdraw, not the aToken
amountuint256The underlying amount to be withdrawn (the amount supplied), expressed in wei units. Use type(uint).max to withdraw the entire aToken balance
toaddressThe address that will receive the underlying asset. This will be the same as msg.sender if the user wants to receive the tokens into their own wallet, or use a different address if the beneficiary is a different wallet

Return Values:

TypeDescription
uint256The final amount withdrawn

borrow

function borrow(    address asset,    uint256 amount,    uint256 interestRateMode,    uint16 referralCode,    address onBehalfOf) public virtual override

Allows users to borrow a specific amount of the reserve underlying asset, provided the borrower has already supplied enough collateral, or they were given enough allowance by a credit delegator on the corresponding debt token (VariableDebtToken). For example, if a user borrows 100 USDC passing their own address as onBehalfOf, they will receive 100 USDC into their wallet and 100 variable debt tokens.

NOTE: If onBehalfOf is not the same as msg.sender, then onBehalfOf must have supplied enough collateral via supply() and have delegated credit to msg.sender via approveDelegation().

Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset to borrow
amountuint256The amount to be borrowed, expressed in wei units
interestRateModeuint256Should always be passed a value of 2 (variable rate mode)
referralCodeuint16Referral supply is currently inactive, you can pass 0. This code is used to register the integrator originating the operation, for potential rewards. 0 if the action is executed directly by the user, without any middle-men
onBehalfOfaddressThis should be the address of the borrower calling the function if they want to borrow against their own collateral, or the address of the credit delegator if the caller has been given credit delegation allowance

repay

function repay(    address asset,    uint256 amount,    uint256 interestRateMode,    address onBehalfOf) public virtual override returns (uint256)

Repays a borrowed amount on a specific reserve, burning the equivalent debt tokens owned. For example, if a user repays 100 USDC, the 100 variable debt tokens owned by the onBehalfOf address will be burned.

When repaying, the Pool contract must have allowance to spend funds on behalf of msg.sender for at least the amount for the asset you are repaying with. This can be done via the standard ERC20 approve() method on the underlying token contract.

You cannot call repay() multiple times in the same block.

Input Parameters:

NameTypeDescription
assetaddressThe address of the borrowed underlying asset previously borrowed
amountuint256The amount to repay, expressed in wei units. Use type(uint256).max in order to repay the whole debt, ONLY when the repayment is not executed on behalf of a 3rd party. In case of repayments on behalf of another user, it's recommended to send an amount slightly higher than the current borrowed amount
interestRateModeuint256Only available option is 2 (variableRateMode)
onBehalfOfaddressThe address of the user who will get their debt reduced/removed. This should be the address of the user calling the function if they want to reduce/remove their own debt, or the address of any other borrower whose debt should be removed

repayWithPermit

function repayWithPermit(    address asset,    uint256 amount,    uint256 interestRateMode,    address onBehalfOf,    uint256 deadline,    uint8 permitV,    bytes32 permitR,    bytes32 permitS) public virtual override returns (uint256)

Repay with transfer approval of the borrowed asset to be repaid, done via permit function. This method removes the need for separate approval tx before repaying asset to the pool. See: https://eips.ethereum.org/EIPS/eip-2612.

Permit signature must be signed by msg.sender with spender value as Pool address.

Input Parameters:

NameTypeDescription
assetaddressThe address of the borrowed underlying asset previously borrowed. The same asset as used in permit v, r, and s
amountuint256The amount to repay, expressed in wei units. Use type(uint256).max in order to repay the whole debt to pay without leaving aToken dust. The same amount as used in permit v,r,s
interestRateModeuint256Only available option is 2 (variableRateMode)
onBehalfOfaddressThe address of the user who will get their debt reduced/removed. This should be the address of the user calling the function if they want to reduce/remove their own debt, or the address of any other borrower whose debt should be removed
deadlineuint256The unix timestamp up until which the permit signature is valid
permitVuint8The v parameter of the ERC712 permit signature
permitRbytes32The r parameter of the ERC712 permit signature
permitSbytes32The s parameter of the ERC712 permit signature

Return Values:

TypeDescription
uint256The final amount repaid

repayWithATokens

function repayWithATokens(address asset, uint256 amount, uint256 interestRateMode) public virtual override returns (uint256)

Allows a user to repay a borrowed amount on a specific reserve using the reserve aTokens, burning the equivalent debt tokens. For example, a user repays 100 USDC using 100 aUSDC, burning 100 variable debt tokens. Passing uint256.maxas the amount will clean up any residual aToken dust balance, if the user aToken balance is not enough to cover the whole debt.

Input Parameters:

NameTypeDescription
assetaddressThe address of the borrowed underlying asset previously borrowed
amountuint256The amount to repay. Use type(uint256).max in order to repay the whole debt for asset to pay without leaving aToken dust
interestRateModeuint256Only available option is 2 (variableRateMode)

Return Values:

TypeDescription
uint256The final amount repaid

setUserUseReserveAsCollateral

function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) public virtual override

Allows suppliers to enable/disable a specific supplied asset as collateral. Sets the asset of msg.sender to be used as collateral or not.

An asset in Isolation Mode can be enabled to use as collateral only if no other asset is already enabled to use as collateral.

An asset with LTV parameter of 0% cannot be enabled as collateral.

The user won’t be able to disable an asset as collateral if they have an outstanding debt position which could be left with the Health Factor < HEALTH_FACTOR_LIQUIDATION_THRESHOLD on disabling the given asset as collateral.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset supplied
useAsCollateralbooltrue if the user wants to use the supply as collateral, false otherwise

liquidationCall

function liquidationCall(    address collateralAsset,    address debtAsset,    address user,    uint256 debtToCover,    bool receiveAToken) public virtual override

Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1.

When the health factor of a position is below 1, the caller (liquidator) repays the debtToCover amount of debt of the user getting liquidated. This is part or all of the outstanding borrowed amount on behalf of the borrower. The caller then receives a proportional amount of the collateralAsset (discounted amount of collateral) plus a liquidation bonus to cover market risk.

Liquidators can decide if they want to receive an equivalent amount of collateral aTokens instead of the underlying asset. When the liquidation is completed successfully, the health factor of the position is increased, bringing the health factor above 1.

Liquidators can only close a certain amount of collateral defined by a close factor. Currently the close factor is 0.5. In other words, liquidators can only liquidate a maximum of 50% of the amount pending to be repaid in a position. The liquidation discount applies to this amount.

  • In most scenarios, profitable liquidators will choose to liquidate as much as they can (50% of the user position).

  • debtToCover parameter can be set to uint(-1) and the protocol will proceed with the highest possible liquidation allowed by the close factor.

  • To check a user's health factor, use [getUserAccountData()].

Liquidators must approve() the Pool contract to use debtToCover of the underlying ERC20 of the asset used for the liquidation.

Input Parameters:

NameTypeDescription
collateralAssetaddressThe address of the underlying asset used as collateral, to receive as result of the liquidation
debtAssetaddressThe address of the underlying borrowed asset to be repaid with the liquidation
useraddressThe address of the borrower getting liquidated
debtToCoveruint256The debt amount of borrowed asset the liquidator will repay
receiveATokenbooltrue if the liquidator wants to receive the aTokens equivalent of the purchased collateral, false if they want to receive the underlying collateral asset directly

flashLoan

function flashLoan(    address receiverAddress,    address[] calldata assets,    uint256[] calldata amounts,    uint256[] calldata interestRateModes,    address onBehalfOf,    bytes calldata params,    uint16 referralCode) public virtual override

Allows users to access liquidity of the pool for a given list of assets within one transaction, as long as the amount taken plus a fee is returned. The receiver must approve the Pool contract for at least the amount borrowed + fee, otherwise the transaction will revert.

The flash loan fee is waived for approved FLASH_BORROWER.

There are security concerns for developers of flashloan receiver contracts that must be taken into consideration. For further details, visit Flash Loan Developers Guide.

Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal.

Input Parameters:

NameTypeDescription
receiverAddressaddressThe address of the contract receiving the flash-borrowed funds, implementing the IFlashLoanReceiver interface
assetsaddress[]The addresses of the assets being flash-borrowed
amountsuint256[]The amounts of the assets being flash-borrowed. This needs to contain the same number of entries as assets
interestRateModesuint256[]The types of the debt position to open if the flash loan is not returned: 0 -> Don't open any debt, the amount + fee must be paid in this case or just revert if the funds can't be transferred from the receiver. 2 -> Open variable rate borrow position for the value of the amount flash-borrowed to the onBehalfOf address
onBehalfOfaddressThe address that will receive the debt if the associated interestRateModes is 1 or 2. onBehalfOf must already have approved sufficient borrow allowance of the associated asset to msg.sender
paramsbytesVariadic packed params to pass to the receiver as extra information
referralCodeuint16Referral supply is currently inactive, you can pass 0. This code is used to register the integrator originating the operation, for potential rewards. 0 if the action is executed directly by the user, without any middle-men

flashLoanSimple

function flashLoanSimple(    address receiverAddress,    address asset,    uint256 amount,    bytes calldata params,    uint16 referralCode) public virtual override

Allows users to access liquidity of the pool for a given asset within one transaction, as long as the amount taken plus a fee is returned. The receiver must approve the Pool contract for at least the amount borrowed + fee, otherwise the transaction will revert.

This function does not waive the fee for approved FLASH_BORROWER, nor does it allow for opening a debt position instead of repaying.

There are security concerns for developers of flashloan receiver contracts that must be kept into consideration.

Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal.

Input Parameters:

NameTypeDescription
receiverAddressaddressThe address of the contract receiving the flash-borrowed funds, implementing the IFlashLoanReceiver interface
assetaddressThe address of the asset being flash-borrowed
amountuint256The amount of the asset being flash-borrowed
paramsbytesVariadic packed params to pass to the receiver as extra information
referralCodeuint16Referral supply is currently inactive, you can pass 0. This code is used to register the integrator originating the operation, for potential rewards. 0 if the action is executed directly by the user, without any middle-men

mintToTreasury

function mintToTreasury(address[] calldata assets) external virtual override

Mints the assets accrued through the reserve factor to the treasury in the form of aTokens for the given list of assets.

Input Parameters:

NameTypeDescription
assetsaddress[]The list of reserves for which the minting needs to be executed

finalizeTransfer

function finalizeTransfer(    address asset,    address from,    address to,    uint256 amount,    uint256 balanceFromBefore,    uint256 balanceToBefore) external virtual override

Validates and finalizes an aToken transfer. It is only callable by the overlying aToken of the asset.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the aToken
fromaddressThe user from which the aTokens are transferred
toaddressThe user receiving the aTokens
amountuint256The amount being transferred/withdrawn
balanceFromBeforeuint256The aToken balance of the from user before the transfer
balanceToBeforeuint256The aToken balance of the to user before the transfer

setUserEMode

function setUserEMode(uint8 categoryId) external virtual override

Allows a user to use the protocol in efficiency mode. The category id must be a valid id already defined by Pool or Risk Admins.

Will revert if user is borrowing non-compatible asset or if the change will drop the Health Factor < HEALTH_FACTOR_LIQUIDATION_THRESHOLD.

Input Parameters:

NameTypeDescription
categoryIduint8The eMode category id (0 - 255) defined by Risk or Pool Admins. categoryId set to 0 is a non eMode category

mintUnbacked

function mintUnbacked(    address asset,    uint256 amount,    address onBehalfOf,    uint16 referralCode) external virtual override onlyBridge

Allows contracts, with BRIDGE role permission, to mint an amount of unbacked aTokens to the onBehalfOf address. This method is part of the V3 Portals feature.

Only available to the addresses with BRIDGE role. Bridge addresses can be whitelisted by Aave Governance.

Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset to mint
amountuint256The amount to mint
onBehalfOfaddressThe address that will receive the aTokens
referralCodeuint16Referral supply is currently inactive, you can pass 0. This code is used to register the integrator originating the operation, for potential rewards. 0 if the action is executed directly by the user, without any middle-men

backUnbacked

function backUnbacked(    address asset,    uint256 amount,    uint256 fee) external virtual override onlyBridge returns (uint256)

Allows contracts, with BRIDGE role permission, to back the current unbacked underlying aTokens with amount and pay fee. This method is part of the V3 Portals feature.

Only available to the addresses with BRIDGE role. Bridge addresses can be whitelisted by the governance.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset to back
amountuint256The amount of asset supplied to back the unbacked tokens
feeuint256The amount paid in fees

Return Value:

TypeDescription
uint256The final amount backed, representing the portion of assets that were successfully supplied to back the unbacked aTokens, including any fees that were taken into account.

initReserve

function initReserve(    address asset,    address aTokenAddress,    address stableDebtAddress,    address variableDebtAddress,    address interestRateStrategyAddress) external virtual override onlyPoolConfigurator

Initializes a reserve, activating it, assigning an aToken and debt tokens and an interest rate strategy.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve
aTokenAddressaddressThe address of the aToken that will be assigned to the reserve
stableDebtAddressaddressThe address of the StableDebtToken that will be assigned to the reserve (deprecated)
variableDebtAddressaddressThe address of the VariableDebtToken that will be assigned to the reserve
interestRateStrategyAddressaddressThe address of the interest rate strategy contract

dropReserve

function dropReserve(address asset) external virtual override onlyPoolConfigurator

Drop a reserve.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve

setReserveInterestRateStrategyAddress

function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress) external virtual override onlyPoolConfigurator

Updates the address of the interest rate strategy contract.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve
rateStrategyAddressaddressThe address of the interest rate strategy contract

setConfiguration

function setConfiguration(address asset, DataTypes.ReserveConfigurationMap calldata configuration) external virtual override onlyPoolConfigurator

Sets the configuration bitmap of the reserve as a whole.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve
configurationDataTypes.ReserveConfigurationMapThe new configuration bitmap

The DataTypes.ReserveConfigurationMap struct is composed of the following fields:

bitDescription
0-15LTV
16-31Liquidation threshold
32-47Liquidation bonus
48-55Decimals
56Reserve is active
57Reserve is frozen
58Borrowing is enabled
59Stable rate borrowing enabled (deprecated)
60Asset is paused
61Borrowing in isolation mode is enabled
62Siloed borrowing is enabled
63Flashloaning is enabled
64-79Reserve factor
80-115Borrow cap in whole tokens, borrowCap == 0 => no cap
116-151Supply cap in whole tokens, supplyCap == 0 => no cap
152-167Liquidation protocol fee
168-175eMode category (deprecated)
176-211Unbacked mint cap in whole tokens, unbackedMintCap == 0 => minting disabled
212-251Debt ceiling for isolation mode with (ReserveConfiguration::DEBT_CEILING_DECIMALS) decimals
252Virtual accounting is enabled
253-255Unused

updateBridgeProtocolFee

function updateBridgeProtocolFee(uint256 protocolFee) external virtual override onlyPoolConfigurator

Updates the protocol fee on the bridging.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
protocolFeeuint256The part of the premium sent to the protocol treasury

updateFlashloanPremiums

function updateFlashloanPremiums(uint128 flashLoanPremiumTotal, uint128 flashLoanPremiumToProtocol) external virtual override onlyPoolConfigurator

Updates flash loan premiums. A flash loan premium consists of two parts:

  • A part is sent to aToken holders as extra, one time accumulated interest

  • A part is collected by the protocol treasury

The total premium is calculated on the total borrowed amount. The premium to protocol is calculated on the total premium, being a percentage of flashLoanPremiumTotal.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
flashLoanPremiumTotaluint128The total premium, expressed in bps
flashLoanPremiumToProtocoluint128The part of the premium sent to the protocol treasury, expressed in bps

configureEModeCategory

function configureEModeCategory(uint8 id, DataTypes.EModeCategory memory category) external virtual override onlyPoolConfigurator

Configures a new category for the eMode. In eMode, the protocol allows very high borrowing power to borrow assets of the same category. The category 0 is reserved for volatile heterogeneous assets and it's always disabled.

Each eMode category has a custom ltv and liquidation threshold. Each eMode category may or may not have a custom oracle to override the individual assets price oracles.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
iduint8The total premium, expressed in bps
categoryDataTypes.EModeCategoryThe configuration of the category

The DataTypes.EModeCategory struct is composed of the following fields:

NameTypeDescription
ltvuint16The custom Loan to Value for the eMode category
liquidationThresholduint16The custom liquidation threshold for the eMode category
liquidationBonusuint16The liquidation bonus for the eMode category
collateralBitmapuint128Bitmap of collateral assets in the category
labelstringThe custom label describing the eMode category
borrowableBitmapuint128Bitmap of borrowable assets in the category

resetIsolationModeTotalDebt

function resetIsolationModeTotalDebt(address asset) external virtual override onlyPoolConfigurator

Resets the isolation mode total debt of the given asset to zero. It requires the given asset to have a zero debt ceiling.

Only callable by the PoolConfigurator contract.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset to reset the isolationModeTotalDebt

rescueTokens

function rescueTokens(address token, address to, uint256 amount) external virtual override onlyPoolAdmin

Rescue and transfer tokens locked in this contract.

Only available to POOL_ADMIN role. Pool admin is selected by the governance.

Input Parameters:

NameTypeDescription
tokenaddressThe address of the token
toaddressThe address of the recipient
amountuint256The amount of token to transfer

View Methods

getUserAccountData

function getUserAccountData(address user) external view virtual override returns (    uint256 totalCollateralBase,    uint256 totalDebtBase,    uint256 availableBorrowsBase,    uint256 currentLiquidationThreshold,    uint256 ltv,    uint256 healthFactor)

Returns the user account data across all the reserves.

Input Parameters:

NameTypeDescription
useraddressThe address of the user

Return Values:

NameTypeDescription
totalCollateralBaseuint256The total collateral of the user in the base currency used by the price feed
totalDebtBaseuint256The total debt of the user in the base currency used by the price feed
availableBorrowsBaseuint256The borrowing power left of the user in the base currency used by the price feed
currentLiquidationThresholduint256The liquidation threshold of the user
ltvuint256The loan to value of the user
healthFactoruint256The current health factor of the user

getConfiguration

function getConfiguration(address asset) external view virtual override returns (DataTypes.ReserveConfigurationMap memory)

Returns the configuration of the reserve.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve

Return Values:

TypeDescription
DataTypes.ReserveConfigurationMapThe configuration of the reserve

The DataTypes.ReserveConfigurationMap struct is composed of the following fields:

bitDescription
0-15LTV
16-31Liquidation threshold
32-47Liquidation bonus
48-55Decimals
56Reserve is active
57Reserve is frozen
58Borrowing is enabled
59Stable rate borrowing enabled (deprecated)
60Asset is paused
61Borrowing in isolation mode is enabled
62Siloed borrowing enabled
63Flashloaning enabled
64-79Reserve factor
80-115Borrow cap in whole tokens, borrowCap == 0 => no cap
116-151Supply cap in whole tokens, supplyCap == 0 => no cap
152-167Liquidation protocol fee
168-175eMode category (deprecated)
176-211Unbacked mint cap in whole tokens, unbackedMintCap == 0 => minting disabled
212-251Debt ceiling for isolation mode with (ReserveConfiguration::DEBT_CEILING_DECIMALS) decimals
252Virtual accounting is enabled for the reserve
253-255Unused

getUserConfiguration

function getUserConfiguration(address user) external view virtual override returns (DataTypes.UserConfigurationMap memory)

Returns the configuration of the user across all the reserves.

Input Parameters:

NameTypeDescription
useraddressThe user address

Return Values:

TypeDescription
DataTypes.UserConfigurationMapThe configuration of the user

The DataTypes.UserConfigurationMap struct is composed of the following fields:

NameTypeDescription
datauint256Bitmap of the users collaterals and borrows. It is divided into pairs of bits, one pair per asset. The first bit indicates if an asset is used as collateral by the user, the second whether an asset is borrowed by the user. The corresponding assets are in the same position as getReservesList(). For example, if the hex value returned is 0x40020, which represents a decimal value of 262176, then in binary it is 1000000000000100000. If we format the binary value into pairs, starting from the right, we get 1 00 00 00 00 00 00 10 00 00. If we start from the right and move left in the above binary pairs, the third pair is 10. Therefore the 1 indicates that third asset from the reserveList is used as collateral, and 0 indicates it has not been borrowed by this user

getReserveNormalizedIncome

function getReserveNormalizedIncome(address asset) external view virtual override returns (uint256)

Returns the ongoing normalized income for the reserve.

A value of 1e27 means there is no income. As time passes, the yield is accrued. A value of 2*1e27 means for each unit of asset, one unit of income has been accrued.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve

Return Values:

TypeDescription
uint256The reserve's normalized income

getReserveNormalizedVariableDebt

function getReserveNormalizedVariableDebt(address asset) external view virtual override returns (uint256)

Returns the normalized variable debt per unit of asset.

A value of 1e27 means there is no debt. As time passes, the debt is accrued. A value of 2*1e27 means that for each unit of debt, one unit worth of interest has been accumulated.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve

Return Values:

TypeDescription
uint256The reserve normalized variable debt

getReservesList

function getReservesList() external view virtual override returns (address[] memory)

Returns the list of the underlying assets of all the initialized reserves. It does not include dropped reserves.

Return Values:

TypeDescription
address[]The addresses of the underlying assets of the initialized reserves

getReserveAddressById

function getReserveAddressById(uint16 id) external view returns (address)

Returns the address of the underlying asset of a reserve by the reserve id as stored in the DataTypes.ReserveData struct.

Input Parameters:

NameTypeDescription
iduint16The id of the reserve as stored in the DataTypes.ReserveData struct

Return Values:

TypeDescription
addressThe address of the reserve associated with id

getEModeCategoryData

function getEModeCategoryData(uint8 id) external view virtual override returns (DataTypes.EModeCategory memory)

Returns the data of an eMode category.

Each eMode category has a custom LTV and liquidation threshold. Each eMode category may or may not have a custom oracle to override the individual assets' price oracles.

Input Parameters:

NameTypeDescription
iduint8The id of the category

Return Values:

TypeDescription
DataTypes.EModeCategoryThe configuration data of the category

The DataTypes.EModeCategory struct is composed of the following fields:

NameTypeDescription
ltvuint16The custom Loan to Value for the eMode category
liquidationThresholduint16The custom liquidation threshold for the eMode category
liquidationBonusuint16The liquidation bonus for the eMode category
collateralBitmapuint128Bitmap of collateral assets in the category
labelstringThe custom label describing the eMode category
borrowableBitmapuint128Bitmap of borrowable assets in the category

getReserveData

function getReserveData(address asset) external view virtual override returns (DataTypes.ReserveData memory)

Returns the state and configuration of the reserve.

Input Parameters:

NameTypeDescription
assetaddressThe address of the underlying asset of the reserve

Return Values:

TypeDescription
DataTypes.ReserveDataThe state and configuration data of the reserve

The DataTypes.ReserveData struct is composed of the following fields:

NameTypeDescription
configurationReserveConfigurationMapStores the reserve configuration
liquidityIndexuint128The yield generated by the reserve during time interval since lastUpdatedTimestamp. Expressed in ray
currentLiquidityRateuint128The current supply rate. Expressed in ray
variableBorrowIndexuint128The yield accrued by reserve during time interval since lastUpdatedTimestamp. Expressed in ray
currentVariableBorrowRateuint128The current variable borrow rate. Expressed in ray
__deprecatedStableBorrowRateuint128DEPRECATED on v3.2.0
lastUpdateTimestampuint40The timestamp of when reserve data was last updated. Used for yield calculation
iduint16The id of the reserve. It represents the reserve’s position in the list of active reserves
liquidationGracePeriodUntiluint40The timestamp until liquidations are not allowed on the reserve. If set to the past, liquidations will be allowed
aTokenAddressaddressThe address of associated aToken
__deprecatedStableDebtTokenAddressaddressDEPRECATED on v3.2.0
variableDebtTokenAddressaddressThe address of associated variable debt token
interestRateStrategyAddressaddressThe address of interest rate strategy
accruedToTreasuryuint128The current treasury balance (scaled)
unbackeduint128The outstanding unbacked aTokens minted through the bridging feature
isolationModeTotalDebtuint128The outstanding debt borrowed against this asset in isolation mode
virtualUnderlyingBalanceuint128The virtual balance of the underlying asset for yield calculation purposes

getUserEMode

function getUserEMode(address user) external view virtual override returns (uint256)

Returns eMode the user is using. 0 is a non eMode category.

Input Parameters:

NameTypeDescription
useraddressThe address of the user

Return Values:

TypeDescription
uint256The eMode id

FLASHLOAN_PREMIUM_TOTAL

function FLASHLOAN_PREMIUM_TOTAL() public view virtual override returns (uint128)

Returns the percent of total flashloan premium paid by the borrower.

A part of this premium is added to reserve's liquidity index i.e. paid to the liquidity provider and the other part is paid to the protocol i.e. accrued to the treasury.

Return Values:

TypeDescription
uint128The total fee on flashloans

BRIDGE_PROTOCOL_FEE

function BRIDGE_PROTOCOL_FEE() public view virtual override returns (uint256)

Returns the part of the bridge fees sent to protocol.

Return Values:

TypeDescription
uint256The percentage of available liquidity to borrow, expressed in bps

FLASHLOAN_PREMIUM_TO_PROTOCOL

function FLASHLOAN_PREMIUM_TO_PROTOCOL() public view virtual override returns (uint128)

Returns the percent of flashloan premium that is accrued to the treasury.

Return Values:

TypeDescription
uint128The percentage of available liquidity to borrow, expressed in bps

MAX_NUMBER_RESERVES

function MAX_NUMBER_RESERVES() public view virtual override returns (uint16)

Returns the maximum number of reserves supported to be listed in this Pool.

Return Values:

TypeDescription
uint16The maximum number of reserves supported

Pure Methods

getRevision

function getRevision() internal pure virtual override returns (uint256)

Returns the revision number of the contract. Needs to be defined in the inherited class as a constant.

Returns 0x1.

Return Values:

TypeDescription
uint256The revision number

Aave.com provides information and resources about the fundamentals of the decentralised non-custodial liquidity protocol called the Aave Protocol, comprised of open-source self-executing smart contracts that are deployed on various permissionless public blockchains, such as Ethereum (the "Aave Protocol" or the "Protocol"). Aave Labs does not control or operate any version of the Aave Protocol on any blockchain network.