AaveAprPairProvider

{{
  "language": "Solidity",
  "sources": {
    "contracts/tranches/strategies/ethena/AaveAprPairProvider.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

import { IsUSDe } from "./IsUSDe.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC20Metadata } from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import { IStrategyAprPairProvider } from "../../interfaces/IAprPairFeed.sol";

/**
 * @title sUSDe AprPairProvider with Aave as Target
 * @notice Fetches target APR from supply weighted aave assets and base APR from Ethena's sUSDe
 */
contract AaveAprPairProvider is IStrategyAprPairProvider {

    uint256 constant SECONDS_PER_YEAR = 31_536_000;
    uint256 constant VESTING_PERIOD_sUSDe = 8 hours;

    uint256 constant BOUND_MIN = 0;
    uint256 constant BOUND_MAX = .4e12;

    IAavePool public aave;
    IsUSDe public sUSDe;
    address[] public benchmarkTokens;

    constructor (
        IAavePool _aave,
        address[] memory _benchmarkTokens,
        IsUSDe _sUSDe
    ) {
        aave = _aave;
        sUSDe = _sUSDe;
        benchmarkTokens = _benchmarkTokens;
    }

    function getAprPair () external view returns (int64 aprTarget, int64 aprBase, uint64 timestamp) {
        timestamp = uint64(block.timestamp);
        aprTarget = getAPRtarget();
        aprBase = getAPRbase();
    }

    /**
     * @notice Calculates the target APR based on supply weighted aave assets
     * @dev Fetches the current APRs and totalSupply from Aave's Protocol and calculate the weighted average
     * @return The target APR as an int64, scaled by 1e12 (12 decimal places)
     */
    function getAPRtarget () public view returns (int64) {
        uint256 totalWeight = 0;
        uint256 weightedSum  = 0;
        for (uint256 i = 0; i < benchmarkTokens.length; i++) {
            (uint256 apr, uint256 totalSupply) = getAaveAssetInner(i);
            weightedSum += apr * totalSupply;
            totalWeight += totalSupply;
        }
        uint256 aprAvg = weightedSum  / totalWeight;
        require(BOUND_MIN <= aprAvg && aprAvg <= BOUND_MAX, "Invalid_Apr_Avg");
        return int64(int256(aprAvg));
    }

    /**
     * @notice Calculates the base APR for sUSDe based on the current vesting amount
     */
    function getAPRbase () public view returns (int64) {
        uint256 t1 = block.timestamp;
        uint256 t0 = sUSDe.lastDistributionTimestamp();
        uint256 deltaT = t1 - t0;

        if (deltaT >= VESTING_PERIOD_sUSDe) {
            // No distribution yet;
            return 0;
        }

        uint256 unvestedAmount = sUSDe.getUnvestedAmount();
        uint256 totalAssets = sUSDe.totalAssets();

        uint256 apr = unvestedAmount * SECONDS_PER_YEAR * 1e18
            / (VESTING_PERIOD_sUSDe - deltaT)
            / totalAssets;

        return int64(int256(apr * 1e12 / 1e18));
    }

    function getAaveAsset (uint256 i) external view returns (uint256 apr, uint256 totalSupply) {
        return getAaveAssetInner(i);
    }

    /// @notice Fetch raw Aave reserve data needed for APR & total supplied.
    function getAaveAssetInner(uint256 i) internal view returns (uint256 apr, uint256 totalSupply) {
        address asset = benchmarkTokens[i];
        (
            ,
            ,
            uint128 currentLiquidityRate,
            ,
            ,
            ,
            ,
            ,
            address aTokenAddress,
            ,
            ,
            ,
            ,
            ,
        ) = aave.getReserveData(asset);

        uint256 ONE_in = 1e27;
        uint256 ONE_out = 1e12;
        uint256 totalAToken = IERC20Metadata(aTokenAddress).totalSupply();

        apr = currentLiquidityRate * ONE_out / ONE_in;
        totalSupply = totalAToken;
    }
}


interface IAavePool {
    struct ReserveDataLegacy {
        //stores the reserve configuration
        uint256 configuration;
        //the liquidity index. Expressed in ray
        uint128 liquidityIndex;
        //the current supply rate. Expressed in ray
        uint128 currentLiquidityRate;
        //variable borrow index. Expressed in ray
        uint128 variableBorrowIndex;
        //the current variable borrow rate. Expressed in ray
        uint128 currentVariableBorrowRate;
        // DEPRECATED on v3.2.0
        uint128 currentStableBorrowRate;
        //timestamp of last update
        uint40 lastUpdateTimestamp;
        //the id of the reserve. Represents the position in the list of the active reserves
        uint16 id;
        //aToken address
        address aTokenAddress;
        // DEPRECATED on v3.2.0
        address stableDebtTokenAddress;
        //variableDebtToken address
        address variableDebtTokenAddress;
        // DEPRECATED on v3.4.0, should use the `RESERVE_INTEREST_RATE_STRATEGY` variable from the Pool contract
        address interestRateStrategyAddress;
        //the current treasury balance, scaled
        uint128 accruedToTreasury;
        // DEPRECATED on v3.4.0
        uint128 unbacked;
        //the outstanding debt borrowed against this asset in isolation mode
        uint128 isolationModeTotalDebt;
    }
    function getReserveData(address asset) external view returns (
        uint256,
        uint128,
        uint128 currentLiquidityRate,
        uint128,
        uint128,
        uint128,
        uint40 lastUpdateTimestamp,
        uint16 id,
        address aTokenAddress,
        address,
        address,
        address,
        uint128,
        uint128,
        uint128
    );
}
"
    },
    "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
"
    },
    "contracts/tranches/strategies/ethena/IsUSDe.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;

import {IERC4626} from "@openzeppelin/contracts/interfaces/IERC4626.sol";

interface IsUSDe is IERC4626 {
    struct TUserCooldown {
        uint104 cooldownEnd;
        uint152 underlyingAmount;
    }

    function cooldownDuration() external view returns (uint24);
    function unstake(address receiver) external;
    function cooldownAssets(uint256 assets) external returns (uint256);
    function cooldownShares(uint256 shares) external returns (uint256);

    function cooldowns (address user) external view returns (TUserCooldown memory);

    function lastDistributionTimestamp() external view returns (uint256);
    function vestingAmount() external view returns (uint256);
    function totalAssets() external view returns (uint256);
    function getUnvestedAmount () external view returns (uint256);
}
"
    },
    "contracts/tranches/interfaces/IAprPairFeed.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.28;


interface IAprPairFeed {
    struct TRound {
        // SD7x12
        int64 aprTarget;
        int64 aprBase;
        uint64 updatedAt;
        uint64 answeredInRound;
    }

    function updateRoundData(int64 newAprTarget, int64 newAprBase, uint64 timestamp) external;
    function decimals() external view returns (uint8);
    function description() external view returns (string memory);
    function getRoundData(uint64 roundId)external view returns (TRound memory);
    function latestRoundData() external view returns (TRound memory);
}

interface IAprPairFeedListener {
    function onAprChanged() external;
}

interface IStrategyAprPairProvider {
    function getAprPair () external view returns (int64 aprTarget, int64 aprBase, uint64 timestamp);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC4626.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (interfaces/IERC4626.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../token/ERC20/IERC20.sol";
import {IERC20Metadata} from "../token/ERC20/extensions/IERC20Metadata.sol";

/**
 * @dev Interface of the ERC-4626 "Tokenized Vault Standard", as defined in
 * https://eips.ethereum.org/EIPS/eip-4626[ERC-4626].
 */
interface IERC4626 is IERC20, IERC20Metadata {
    event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);

    event Withdraw(
        address indexed sender,
        address indexed receiver,
        address indexed owner,
        uint256 assets,
        uint256 shares
    );

    /**
     * @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
     *
     * - MUST be an ERC-20 token contract.
     * - MUST NOT revert.
     */
    function asset() external view returns (address assetTokenAddress);

    /**
     * @dev Returns the total amount of the underlying asset that is “managed” by Vault.
     *
     * - SHOULD include any compounding that occurs from yield.
     * - MUST be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT revert.
     */
    function totalAssets() external view returns (uint256 totalManagedAssets);

    /**
     * @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToShares(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
     * scenario where all the conditions are met.
     *
     * - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
     * - MUST NOT show any variations depending on the caller.
     * - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
     * - MUST NOT revert.
     *
     * NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
     * “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
     * from.
     */
    function convertToAssets(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
     * through a deposit call.
     *
     * - MUST return a limited value if receiver is subject to some deposit limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
     * - MUST NOT revert.
     */
    function maxDeposit(address receiver) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
     *   call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
     *   in the same transaction.
     * - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
     *   deposit would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewDeposit(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   deposit execution, and are accounted for during deposit.
     * - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function deposit(uint256 assets, address receiver) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
     * - MUST return a limited value if receiver is subject to some mint limit.
     * - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
     * - MUST NOT revert.
     */
    function maxMint(address receiver) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
     * current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
     *   in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
     *   same transaction.
     * - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
     *   would be accepted, regardless if the user has enough tokens approved, etc.
     * - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by minting.
     */
    function previewMint(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
     *
     * - MUST emit the Deposit event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
     *   execution, and are accounted for during mint.
     * - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
     *   approving enough underlying tokens to the Vault contract, etc).
     *
     * NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
     */
    function mint(uint256 shares, address receiver) external returns (uint256 assets);

    /**
     * @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
     * Vault, through a withdraw call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxWithdraw(address owner) external view returns (uint256 maxAssets);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
     *   call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
     *   called
     *   in the same transaction.
     * - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
     *   the withdrawal would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by depositing.
     */
    function previewWithdraw(uint256 assets) external view returns (uint256 shares);

    /**
     * @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   withdraw execution, and are accounted for during withdraw.
     * - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);

    /**
     * @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
     * through a redeem call.
     *
     * - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
     * - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
     * - MUST NOT revert.
     */
    function maxRedeem(address owner) external view returns (uint256 maxShares);

    /**
     * @dev Allows an on-chain or off-chain user to simulate the effects of their redemption at the current block,
     * given current on-chain conditions.
     *
     * - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
     *   in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
     *   same transaction.
     * - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
     *   redemption would be accepted, regardless if the user has enough shares, etc.
     * - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
     * - MUST NOT revert.
     *
     * NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
     * share price or some other type of condition, meaning the depositor will lose assets by redeeming.
     */
    function previewRedeem(uint256 shares) external view returns (uint256 assets);

    /**
     * @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
     *
     * - MUST emit the Withdraw event.
     * - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
     *   redeem execution, and are accounted for during redeem.
     * - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
     *   not having enough shares, etc).
     *
     * NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
     * Those methods should be performed separately.
     */
    function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "viaIR": true,
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}