Pool
Pool
The pool.sol contract is the main user facing contract of the protocol. It exposes the liquidity management methods that can be invoked using either Solidity or Web3 libraries.
Write Methods
supply
function supply(address asset, uint256 amount, address onBehalfOf, uint16 referralCode)
The referralCode is emitted in Supply event and can be for third party referral integrations. To activate referral feature and obtain a unique referral code, integrators need to submit proposal to Aave Governance.
When supplying, the Pool contract must have**allowance()to spend funds on behalf ofmsg.sender** for at-least**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
| Param Name | Type | Description |
|---|---|---|
asset | address | address of the asset being supplied to the pool. |
amount | uint256 | amount of asset being supplied. |
onBehalfOf | address | address that will receive the corresponding aTokens. Note: only the onBehalfOf address will be able to withdraw asset from the pool. |
referralCode | uint16 | unique code for 3rd party referral program integration. Use 0 for no referral. |
supplyWithPermit
function supplyWithPermit(address asset, uint256 amount, address onBehalfOf, uint16 referralCode, uint256 deadline, uint8 permitV, permitR, bytes32 permitS)
Supply with transfer approval of supplied asset via permit function. This method removes the need for separate approval tx before supplying asset to the pool.
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
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | Address of underlying asset being supplied. Same asset as used in permit s,v,r |
amount | uint256 | Amount of asset to be supplied and signed for approval. Same amount as used in permit s,v,r |
onBehalfOf | address | Address that will receive the aTokens. |
referralCode | uint16 | unique code for 3rd party referral program integration. Use 0 for no referral. |
deadline | uint256 | unix timestamp up-till which signature will be valid |
permitV | uint8 | Signature parameter v |
permitR | bytes32 | Signature parameter r |
permitS | bytes32 | Signature parameter s |
withdraw
function withdraw(address asset, uint256 amount, address to)
Withdraws amount of the underlying asset, i.e. redeems the underlying token and burns the aTokens.
If user has any existing debt backed by the underlying token, then the max amount available to withdraw is the amount that will not leave user health factor < 1 after withdrawal.
When withdrawingtoanother address, msg.sendershould have aTokenthat will be burned by Pool .
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | address of the underlying asset, not the aToken |
amount | uint256 | amount deposited, expressed in wei units. Use |
to | address | address that will receive the |
borrow
function borrow(address asset, uint256 amount, uint256 interestRateMode, uint16 referralCode, address onBehalfOf)
Borrows amount of asset with interestRateMode, sending the amount to msg.sender, with the debt being incurred by onBehalfOf.
Note: If onBehalfOf is not 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
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | address of the underlying asset |
amount | uint256 | amount to be borrowed, expressed in wei units |
interestRateMode | uint256 | the type of borrow debt. Stable: 1, Variable: 2 |
referralCode | uint16 | referral code for our referral program. Use 0 for no referral code. |
onBehalfOf | address | address of user who will incur the debt. Use msg.sender when not calling on behalf of a different user. |
repay
function repay(address asset, uint256 amount, uint256 rateMode, address onBehalfOf)
Repays onBehalfOf's debt amount of asset which has a rateMode.
When repaying, the Pool contract must have**allowance()to spend funds on behalf ofmsg.sender** for at-least**amount** for the asset you are repaying with. This can be done via the standard ERC20 approve()method on the underlying token contract.
Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | address of the underlying asset |
amount | uint256 | Amount of underlying asset being repaid. Use uint(-1) to repay the entire 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. |
rateMode | uint256 | the type of debt being repaid. Stable: 1, Variable: 2 |
onBehalfOf | address | address of user who will incur the debt. Use msg.sender when not calling on behalf of a different user. |
repayWithPermit
function repayWithPermit(address asset, uint256 amount, uint256 interestRateMode, address onBehalfOf, uint256 deadline, uint8 permitV, permitR, bytes32 permitS)
Repay with transfer approval of borrowed asset via permit function. This method removes the need for separate approval tx before repaying asset to the pool.
Permit signature must be signed by msg.sender with spender value as Pool address.
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | Address of underlying asset being supplied. Same asset as used in permit s,v,r |
amount | uint256 | Amount of asset to be supplied and signed for approval. Same amount as used in permit s,v,r |
interestRateMode | uint256 | the type of debt being repaid. Stable: 1, Variable: 2 |
onBehalfOf | address | Address that will receive the aTokens. |
deadline | uint256 | unix timestamp up-till which signature will be valid |
permitV | uint8 | Signature parameter v |
permitR | bytes32 | Signature parameter r |
permitS | bytes32 | Signature parameter s |
repayWithATokens
function repayWithATokens(address asset,uint256 amount,uint256 interestRateMode)
Allows user to repay with aTokens of the underlying debt asset without any approvals eg. Pay DAI debt using aDAI tokens.
Call Params
| Param Name | Type | Description |
|---|---|---|
asset | address | Address of the underlying asset to be repaid |
amount | uint256 | Amount of underlying asset being repaid. Use uint256(-1) to pay without leaving aToken dust |
interestRateMode | uint256 | Interest rate mode of the debt position 1 - stable 2 - variable |
swapBorrowRateMode
function swapBorrowRateMode(address asset, uint256 rateMode)
Swaps msg.sender's borrow rate mode between stable and variable.
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | address of the underlying asset |
rateMode | uint256 | the rate mode the user is swapping from. Stable: 1, Variable: 2 |
rebalanceStableBorrowRate
function rebalanceStableBorrowRate(address asset, address user)
Rebalances stable borrow rate of the user for given asset. In certain conditions, the protocol allows for stable rates to be rebalanced to avoid a large percentage of liquidity being borrowed at a stable rate below market variable rate. In V3, The condition for rebalance is if the current supply rate <= supply rate if all borrows are variable * 0.9, contract reference.
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | Address of the underlying token that has been borrowed for which the position is being rebalanced. |
user | address | Address of the user being rebalanced. |
setUserUseReserveAsCollateral
function setUserUseReserveAsCollateral(address asset, bool useAsCollateral)
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.
User won’t be able to disable an asset as collateral if they have an outstanding debt position which could be left with HF < HEALTH_FACTOR_LIQUIDATION_THRESHOLD on disabling the given asset as collateral.
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | address of the underlying asset to be used as collateral |
useAsCollateral | bool | true if the asset should be used as collateral |
liquidationCall
function liquidationCall(address collateral, address debt, address user, uint256 debtToCover, bool receiveAToken)
Liquidate positions with a health factor below 1.
When the health factor of a position is below 1, liquidators repay part or all of the outstanding borrowed amount on behalf of the borrower, while receiving a discounted amount of collateral in return (also known as a liquidation 'bonus"). 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.
Liquidators must `approve()` the `Pool` contract to use `debtToCover` of the underlying ERC20 of the`asset` used for the liquidation.
NOTES
In most scenarios, profitable liquidators will choose to liquidate as much as they can (50% of the
userposition).debtToCoverparameter can be set touint(-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().
Call Params
| Name | Type | Description |
|---|---|---|
collateral | address | address of the collateral reserve |
debt | address | address of the debt reserve |
user | address | address of the borrower |
debtToCover | uint256 | amount of asset debt that the liquidator will repay |
receiveAToken | bool | if true, the user receives the aTokens equivalent of the purchased collateral. If false, the user receives the underlying asset directly. |
flashLoan
function flashLoan( address receiverAddress, address[] calldata assets, uint256[] calldata amounts, uint256[] interestRateModes, address onBehalfOf, bytes calldata params, uint16 referralCode)
Allows users to access liquidity of the pool for given list of assets for one transaction as long as the amount taken plus fee is returned or debt position is opened by the end of transaction.
If no debt position is opened, receiver must approve the Pool contract for at least the amount borrowed + fee, else transaction will revert.
Flash loan fee is waived for the approved flashBorrowers
Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal
Call Params
| Name | Type | Description |
|---|---|---|
receiverAddress | address | Address of the contract that will receive the flash borrowed funds. Must implement the IFlashLoanReceiver interface. |
assets | address[] | Addresses of the underlying assets that will be flash borrowed |
amounts | uint256[] | Amounts of assets being requested for flash borrow. This needs to contain the same number of entries as assets. |
modes | uint256[] | the types of debt position to open if the flashloan is not returned. 0: no open debt. (amount+fee must be paid in this case or revert) 1: stable mode debt 2: variable mode debt |
onBehalfOf | address | if the associated mode is not0 then the incurred debt will be applied to the onBehalfOfaddress. Note: onBehalfOf must already have approved sufficient borrow allowance of the associated asset to msg.sender |
params | bytes | Arbitrary bytes-encoded params that will be passed to executeOperation() method of the receiver contract. |
referralCode | uint16 | Referral Code used for 3rd party integration referral. The unique referral id is can be requested via governance proposal |
flashLoanSimple
function flashLoanSimple( address receiverAddress, address asset, uint256 amount, bytes calldata params, uint16 referralCode)
Allows users to access liquidity of one reserve or one transaction as long as the amount taken plus fee is returned.
Receiver must approve the Pool contract for at least the amount borrowed + fee, else transaction will revert.
Does not waive few for approved flashBorrowers nor allow opening a debt position instead of repaying.
Referral program is currently inactive, you can pass 0 as referralCode. This program may be activated in the future through an Aave governance proposal
Call Params
| Name | Type | Description |
|---|---|---|
receiverAddress | address | Address of the contract that will receive the flash borrowed funds. Must implement the IFlashLoanReceiver interface. |
asset | address | Address of the underlying asset that will be flash borrowed. |
amount | uint256 | Amount of asset being requested for flash borrow |
params | bytes | Arbitrary bytes-encoded params that will be passed to executeOperation() method of the receiver contract. |
referralCode | uint16 | Referral Code used for 3rd party integration referral. The unique referral id is can be requested via governance proposal |
mintToTreasury
function mintToTreasury(address[] calldata assets)
Mints reserve income accrued to treasury (as per the reserve factor) for the given list of assets.
Call Params
| Name | Type | Description |
|---|---|---|
assets | address[] | List of assets for which accrued income is minted |
setUserEMode
function setUserEMode(uint8 categoryId)
Updates the user efficiency mode category. 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 change will drop HF < HEALTH_FACTOR_LIQUIDATION_THRESHOLD
Call Params
| Name | Type | Description |
|---|---|---|
categoryId | uint8 | eMode category id (0 - 255) defined by Risk or Pool Admins. categoryId == 0 ⇒ non E-mode category. |
mintUnbacked
mintUnbacked (asset, amount, onBehalfOf, referralCode)
Allows contracts, with BRIDGE role permission, to mint unbacked aTokens to the onBehalfOf address. This method is part of the V3 Portal feature.
Only available to the addresses withBRIDGErole. Bridge addresses can be whitelisted by the governance.
| Param | Type | Description |
|---|---|---|
asset | address | address of the underlying asset token |
amount | uint256 | the amount to be minted |
onBehalfOf | address | the address which will receive the aTokens |
referralCode | uint16 | Code used to register the integrator originating the operation, for potential rewards 0 if the action is executed directly by the user, without any middle-man |
backUnbacked
backUnbacked (asset, amount, fee)
Allows contracts, with BRIDGE role permission, to back the currently unbacked aTokens with amount of underlying asset and pay fee. This method is part of the V3 Portal feature.
Only available to the addresses withBRIDGErole. Bridge addresses can be whitelisted by the governance.
| Param | Type | Description |
|---|---|---|
asset | address | address of the underlying asset to repay |
amount | uint256 | amount of asset supplied to back the unbacked tokens |
fee | uint256 | amount paid in fee |
rescueTokens
function rescueTokens(address token, address to, uint256 amount)
Rescue and transfer tokens locked in this contract.
Only available toPOOL_ADMINrole. Pool admin is selected by the governance.
View Methods
getReserveData
function getReserveData(address asset)
Returns the state and configuration of the reserve.
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | address of the underlying reserve asset. |
Return Values
| Name | Type | Description |
|---|---|---|
configuration | uint256 | Reserve configuration. bit 0-15: LTV bit 16-31: Liquidation threshold bit 32-47: Liquidation bonus bit 48-55: Decimals bit 56: reserve is active bit 57: reserve is frozen bit 58: borrowing is enabled bit 59: stable rate borrowing enabled bit 60: asset is paused bit 61: borrowing in isolation mode is enabled bit 62-63: reserved bit 64-79: reserve factor bit 80-115: borrow cap in whole tokens, 0 ⇒ no cap bit 116-151: supply cap in whole tokens, 0 ⇒ no cap bit 152-167: liquidation protocol fee bit 168-175: eMode category bit 176-211: unbacked mint cap in whole tokens, 0 ⇒ no cap bit 212-251: debt ceiling for isolation mode with decimals bit 252-255: unused |
liquidityIndex | uint128 | yield generated by reserve during time interval since lastUpdatedTimestamp. Expressed in ray |
currentLiquidityRate | uint128 | current supply rate. Expressed in ray |
variableBorrowIndex | uint128 | yield accrued by reserve during time interval since lastUpdatedTimestamp. Expressed in ray |
currentVariableBorrowRate | uint128 | current variable borrow rate. Expressed in ray |
currentStableBorrowRate | uint128 | current stable borrow rate. Expressed in ray |
lastUpdateTimestamp | uint40 | timestamp of when reserve data was last updated. Used for yield calculation. |
id | uint16 | reserve’s position in the list of active reserves. |
aTokenAddress | address | address of associated aToken |
stableDebtTokenAddress | address | address of associated stable debt token |
variableDebtTokenAddress | address | address of associated variable debt token |
interestRateStrategyAddress | address | address of interest rate strategy. |
accruedToTreasury | uint128 | the current treasury balance (scaled) |
unbacked | uint128 | the outstanding unbacked aTokens minted through the bridging feature |
isolationModeTotalDebt | uint128 | the outstanding debt borrowed against this asset in isolation mode |
getUserAccountData
function getUserAccountData(address user)
Returns the user account data across all the reserves
Call params
| Name | Type | Description |
|---|---|---|
user | address | address of the user |
Return Values
| Name | Type | Description |
|---|---|---|
totalCollateralBase | uint256 | total collateral of the user, in market’s base currency |
totalDebtBase | uint256 | total debt of the user, in market’s base currency |
availableBorrowsBase | uint256 | borrowing power left of the user, in market’s base currency |
currentLiquidationThreshold | uint256 | liquidation threshold of the user - weighted average of liquidtion threshold of collateral reserves |
ltv | uint256 | maximum Loan To Value of the user - weighted average of max ltv of collateral reserves |
healthFactor | uint256 | current health factor of the user |
getConfiguration
function getConfiguration(address asset)
Returns the configuration of the reserve.
Call Params
| Name | Type | Description |
|---|---|---|
asset | address | address of the underlying reserve asset. |
Return Values
| Name | Type | Description |
|---|---|---|
configuration | uint256 | Reserve configuration. bit 0-15: LTV bit 16-31: Liquidation threshold bit 32-47: Liquidation bonus bit 48-55: Decimals bit 56: reserve is active bit 57: reserve is frozen bit 58: borrowing is enabled bit 59: stable rate borrowing enabled bit 60: asset is paused bit 61: borrowing in isolation mode is enabled bit 62-63: reserved bit 64-79: reserve factor bit 80-115: borrow cap in whole tokens, 0 ⇒ no cap bit 116-151: supply cap in whole tokens, 0 ⇒ no cap bit 152-167: liquidation protocol fee bit 168-175: eMode category bit 176-211: unbacked mint cap in whole tokens, 0 ⇒ no cap bit 212-251: debt ceiling for isolation mode with decimals bit 252-255: unused |
getUserConfiguration
function getUserConfiguration(address user)
Returns the configuration of the user across all the reserves.
Call Params
| Name | Type | Description |
|---|---|---|
user | address | address of the user |
Return Values
| Type | Description |
|---|---|
uint256 | Bitmap of the users collaterals and borrows. Its divided into pairs of bits, one pair for each asset. The first bit of the pair indicates if it is being used as collateral by the user, the second bit indicates if it is being borrowed. 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)
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.
Return Value
| Type | Description |
|---|---|
uint256 | Normalized income, expressed in ray |
getReserveNormalizedDebt
function getReserveNormalizedVariableDebt(address asset)
Returns the ongoing normalized variable debt for the reserve.
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.
Return Value
| Type | Description |
|---|---|
uint256 | Normalized debt, expressed in ray |
getReservesList
function getReservesList()
Returns the list of initialized reserves.
getEModeCategoryData
function getEModeCategoryData(uint8 id)
Returns category data for the given eModeCategory id.
Return Values
| Type | Description |
|---|---|
uint16 | loan to value (ltv) for the given eModeCategory id |
uint16 | liquidationThreshold for the given eModeCategory id |
uint16 | liquidationBonus for the given eModeCategory id |
address | custom price source for the eMode category |
string | custom label describing the eMode category |
getUserEMode
function getUserEMode(address user)
Returns eModeCategory Id of the user’s eMode. 0 ⇒ no eMode.
FLASHLOAN_PREMIUM_TOTAL
function FLASHLOAN_PREMIUM_TOTAL() public view 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.
FLASHLOAN_PREMIUM_TO_PROTOCOL
function FLASHLOAN_PREMIUM_TO_PROTOCOL() public view returns (uint128)
Returns the percent of flashloan premium that is accrued to the treasury.
ABI
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