Liquidity Mining

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Liquidity Mining
Liquidity mining/incentives was implemented in the Main Aave market via AIP-16, enabling incentives for both depositing and borrowing. Incentives are also currently implemented on the Polygon market & Avalanche market, using the same implementation details as described on this page.
Market
Code
Address
Main Market
​Github​
​0xd784927Ff2f95ba542BfC824c8a8a98F3495f6b5​
Polygon Market
​Github​
​0x357D51124f59836DeD84c8a1730D72B749d8BC23​
Avalanche
​Code​
​0x01D83Fe6A10D2f2B7AF17034343746188272cAc9​
Integration Guide
0. Prerequisites
Your user(s) should already have a position in the protocol. Depending on the market and incentives that are enabled, they should already have a deposit, borrow, or both, in one of the incentivised assets. 
To check if an asset is current incentivised, use the getAssetData() method, passing in the associated aToken or debtToken address of the incentivised asset. To get a list of associated tokens per asset, see also getReserveTokensAddresses() in the Protocol Data Provider.
1. Check the user(s) reward balance
Call the getRewardsBalance() method, passing in the relevant token addresses (aTokens and/or debtTokens) as an array.
2. Claim the accrued rewards
2.1 Claim rewards from the user
Call the claimRewards() method, passing in the relevant token addresses (aTokens and/or debtTokens) as an array. The msg.sender must match the user's address that has accrued the rewards.
2.2 Claim rewards on behalf of the user
A claimer must have been set via the setClaimer() method, enabling the caller to claim on the user's behalf.
Call the claimRewardsOnBehalf() method, passing in the relevant token addresses (aTokens and/or debtTokens) as an array. The msg.sender must have been previously set via setClaimer().
3. Consider the token that is rewarded
For the main market, stkAAVE is rewarded and automatically accrues interest based on the Staking AAVE parameters once claimed. There is an associated 10 day cool down period to convert stkAAVE to AAVE, with a 2 day redeem period to do so. Ensure that this information is presented to the user and handled correctly.
For the Polygon market, WMATIC is rewarded with no 'lock up' period. Ensure that you account for the difference between WMATIC and the native MATIC, specifically that WMATIC needs to be unwrapped to MATIC. This can be done by calling withdraw() on the WMATIC contract.
4. Calculating Incentives APY
APY = normalizedEmissionPerSecond * rewardTokenPriceInEth * SECONDS_PER_YEAR / normalizedTotalTokenSupply 
Note:
normalizedEmissionPerSecond = emissionPerSecond/RWARD_TOKEN_DECIMALS
Reward Token is AAVE for mainnet and Matic for polygon. 
normalizedTotalTokenSupply = tokenTotalSupplyNormalized * tokenPriceInEth,where token is the incentivized a/s/v token and token price is same as underlying asset's price. 
 You can get price for reward token as well as reserve token from AavePriceOracle 
Methods
claimRewards()
function claimRewards(address[] calldata assets, uint256 amount, address to)
Claims the accrued rewards for the assets, accumulating any pending rewards.
Parameter Name
Type
Description
assets
address[]
addresses of the asset that accrue rewards, i.e. aTokens or debtTokens.

To get a list of associated tokens per asset, see also getReserveTokensAddresses() in the Protocol Data Provider.
amount
uint256
amount to claim, expressed in wei 
to
address
address where the claimed rewards will be sent
claimRewardsOnBehalf()
function claimRewardsOnBehalf(address[] calldata assets, uint256 amount, address user, address to)
Claims the accrued rewards for the assets, accumulating any pending rewards, on behalf of user.
The user must have previously called setClaimer(), setting the msg.sender as the approved claimer.
Parameter Name
Type
Description
assets
address[]
addresses of the asset that accrue rewards, i.e. aTokens or debtTokens.

To get a list of associated tokens per asset, see also getReserveTokensAddresses() in the Protocol Data Provider.
amount
uint256
amount to claim, expressed in wei 
user
address
address of the user who has pending rewards to claim
to
address
address where the claimed rewards will be sent
setClaimer()
function setClaimer(address user, address caller)
Sets an authorised caller to claim all rewards on behalf of the user.  This can only be set via Governance.
Parameter Name
Type
Description
user
address
address of the user who has pending rewards
caller
address
address of the new authorised claimer
View Methods
getAssetData()
getAssetData()is currently available only on ethereum markets. In case you are working on Polygon markets (main or mumbai), please read data from the public mapping assetsdirectly 😅
function getAssetData(address asset)
Returns the asset index, the emissions per second (i.e. current rewards rate), and the last updated timestamp.
Parameter Name
Type
Description
asset
address
address of the asset that accrue rewards, i.e. aTokens or debtTokens.

To get a list of associated tokens per asset, see also getReserveTokensAddresses() in the Protocol Data Provider. 
getClaimer()
function getClaimer(address user)
Returns the authorised claimer of user's accrued rewards. See also setClaimer().
Parameter Name
Type
Description
user
address
address of the authorised claimer
getRewardsBalance()
function getRewardsBalance(address[] assets, address user)
Returns the total rewards of user for assets.
Parameter Name
Type
Description
assets
address[]
addresses of the asset that accrue rewards, i.e. aTokens or debtTokens.

To get a list of associated tokens per asset, see also getReserveTokensAddresses() in the Protocol Data Provider.
user
address
address of the user who has pending rewards to claim
getUserAssetData()
function getUserAssetData(address user, address asset)
Returns the data of user on a distribution from asset
Parameter Name
Type
Description
user
address
address of the user
asset
address
address of the asset that accrue rewards, i.e. aTokens or debtTokens.

To get a list of associated tokens per asset, see also getReserveTokensAddresses() in the Protocol Data Provider. 
getUserUnclaimedRewards()
function getUserUnclaimedRewards(address user)
Returns the unclaimed accumulated rewards of user for their last action in the protocol.
Parameter Name
Type
Description
user
address
address of the user
getDistributionEnd()
function getDistributionEnd()
Returns the end of the distribution period