Contract

Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta

More Options

• Similar
• Submit Audit
• Compare

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

import "./InterestRateModel.sol";

/**
 * @title JumpRateModel Contract
 */
contract JumpRateModel is InterestRateModel {
    event NewInterestParams(
        uint256 baseRatePerBlock, uint256 multiplierPerBlock, uint256 jumpMultiplierPerBlock, uint256 kink
    );

    uint256 private constant BASE = 1e18;

    /**
     * @notice The approximate number of blocks per year that is assumed by the interest rate model
     */
    uint256 public constant blocksPerYear = 9556363;

    /**
     * @notice The multiplier of utilization rate that gives the slope of the interest rate
     */
    uint256 public multiplierPerBlock;

    /**
     * @notice The base interest rate which is the y-intercept when utilization rate is 0
     */
    uint256 public baseRatePerBlock;

    /**
     * @notice The multiplierPerBlock after hitting a specified utilization point
     */
    uint256 public jumpMultiplierPerBlock;

    /**
     * @notice The utilization point at which the jump multiplier is applied
     */
    uint256 public kink;

    /// @dev we know that we do not need to use safemath, however safemath is still used for safety
    /// and to not modify existing code.

    /**
     * @notice Construct an interest rate model
     * @param baseRatePerYear The approximate target base APR, as a mantissa (scaled by BASE)
     * @param multiplierPerYear The rate of increase in interest rate wrt utilization (scaled by BASE)
     * @param jumpMultiplierPerYear The multiplierPerBlock after hitting a specified utilization point
     * @param kink_ The utilization point at which the jump multiplier is applied
     */
    constructor(uint256 baseRatePerYear, uint256 multiplierPerYear, uint256 jumpMultiplierPerYear, uint256 kink_) {
        baseRatePerBlock = baseRatePerYear / blocksPerYear;
        multiplierPerBlock = multiplierPerYear / blocksPerYear;
        jumpMultiplierPerBlock = jumpMultiplierPerYear / blocksPerYear;
        kink = kink_;

        emit NewInterestParams(baseRatePerBlock, multiplierPerBlock, jumpMultiplierPerBlock, kink);
    }

    /**
     * @notice Calculates the utilization rate of the market: `borrows / (cash + borrows - reserves)`
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market (currently unused)
     * @return The utilization rate as a mantissa between [0, BASE]
     */
    function utilizationRate(uint256 cash, uint256 borrows, uint256 reserves) public pure returns (uint256) {
        // Utilization rate is 0 when there are no borrows
        if (borrows == 0) {
            return 0;
        }

        return (borrows * BASE) / (cash + borrows - reserves);
    }

    /**
     * @notice Calculates the current borrow rate per block, with the error code expected by the market
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market
     * @return The borrow rate percentage per block as a mantissa (scaled by BASE)
     */
    function getBorrowRate(uint256 cash, uint256 borrows, uint256 reserves) public view override returns (uint256) {
        uint256 util = utilizationRate(cash, borrows, reserves);

        if (util <= kink) {
            return ((util * multiplierPerBlock) / BASE) + baseRatePerBlock;
        } else {
            uint256 normalRate = ((kink * multiplierPerBlock) / BASE) + baseRatePerBlock;
            uint256 excessUtil = util - kink;
            return ((excessUtil * jumpMultiplierPerBlock) / BASE) + normalRate;
        }
    }

    /**
     * @notice Calculates the current supply rate per block
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market
     * @param reserveFactorMantissa The current reserve factor for the market
     * @return The supply rate percentage per block as a mantissa (scaled by BASE)
     */
    function getSupplyRate(uint256 cash, uint256 borrows, uint256 reserves, uint256 reserveFactorMantissa)
        public
        view
        override
        returns (uint256)
    {
        uint256 oneMinusReserveFactor = BASE - reserveFactorMantissa;
        uint256 borrowRate = getBorrowRate(cash, borrows, reserves);
        uint256 rateToPool = (borrowRate * oneMinusReserveFactor) / BASE;
        return (utilizationRate(cash, borrows, reserves) * rateToPool) / BASE;
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.23;

/**
 * @title InterestRateModel Interface
 */
abstract contract InterestRateModel {
    /// @notice Indicator that this is an InterestRateModel contract (for inspection)
    bool public constant isInterestRateModel = true;

    /**
     * @notice Calculates the current borrow interest rate per block
     * @param cash The total amount of cash the market has
     * @param borrows The total amount of borrows the market has outstanding
     * @param reserves The total amount of reserves the market has
     * @return The borrow rate per block (as a percentage, and scaled by 1e18)
     */
    function getBorrowRate(
        uint cash,
        uint borrows,
        uint reserves
    ) external view virtual returns (uint);

    /**
     * @notice Calculates the current supply interest rate per block
     * @param cash The total amount of cash the market has
     * @param borrows The total amount of borrows the market has outstanding
     * @param reserves The total amount of reserves the market has
     * @param reserveFactorMantissa The current reserve factor the market has
     * @return The supply rate per block (as a percentage, and scaled by 1e18)
     */
    function getSupplyRate(
        uint cash,
        uint borrows,
        uint reserves,
        uint reserveFactorMantissa
    ) external view virtual returns (uint);
}

{
  "remappings": [
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "ds-test/=lib/openzeppelin-contracts-upgradeable/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": true,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"uint256","name":"baseRatePerYear","type":"uint256"},{"internalType":"uint256","name":"multiplierPerYear","type":"uint256"},{"internalType":"uint256","name":"jumpMultiplierPerYear","type":"uint256"},{"internalType":"uint256","name":"kink_","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"baseRatePerBlock","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"multiplierPerBlock","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"jumpMultiplierPerBlock","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"kink","type":"uint256"}],"name":"NewInterestParams","type":"event"},{"inputs":[],"name":"baseRatePerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"blocksPerYear","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"cash","type":"uint256"},{"internalType":"uint256","name":"borrows","type":"uint256"},{"internalType":"uint256","name":"reserves","type":"uint256"}],"name":"getBorrowRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"cash","type":"uint256"},{"internalType":"uint256","name":"borrows","type":"uint256"},{"internalType":"uint256","name":"reserves","type":"uint256"},{"internalType":"uint256","name":"reserveFactorMantissa","type":"uint256"}],"name":"getSupplyRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isInterestRateModel","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"jumpMultiplierPerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"kink","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"multiplierPerBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"cash","type":"uint256"},{"internalType":"uint256","name":"borrows","type":"uint256"},{"internalType":"uint256","name":"reserves","type":"uint256"}],"name":"utilizationRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"}]

0x604060808152600436101561001357600080fd5b600090813560e01c806315f24053146101cd5780632191f92a146101b25780636e71e2d8146101905780638726bb8914610174578063a385fb9614610157578063b8168816146100df578063b9f9850a146100c1578063f14039de146100a35763fd2da3391461008257600080fd5b3461009f578160031936011261009f576020906003549051908152f35b5080fd5b503461009f578160031936011261009f576020906001549051908152f35b503461009f578160031936011261009f576020906002549051908152f35b503461009f57608036600319011261009f576004359160243560443590670de0b6b3a764000092606435840390848211610143575082828561013461012f9461012f61013b988c9860209d61024a565b610207565b04936102c0565b049051908152f35b634e487b7160e01b81526011600452602490fd5b503461009f578160031936011261009f57602090516291d18b8152f35b503461009f578160031936011261009f57602091549051908152f35b503461009f576020906101ab6101a5366101e8565b916102c0565b9051908152f35b503461009f578160031936011261009f576020905160018152f35b503461009f576020906101ab6101e2366101e8565b9161024a565b606090600319011261020257600435906024359060443590565b600080fd5b8181029291811591840414171561021a57565b634e487b7160e01b600052601160045260246000fd5b9190820180921161021a57565b9190820391821161021a57565b9061025592916102c0565b6003548082116102865750670de0b6b3a76400006102796102839260005490610207565b0460015490610230565b90565b90610283916102ba6102b1670de0b6b3a7640000926102ab8461027960005484610207565b9461023d565b60025490610207565b04610230565b91811561031857670de0b6b3a7640000820292670de0b6b3a763ffff198385040161021a576102f7926102f291610230565b61023d565b908115610302570490565b634e487b7160e01b600052601260045260246000fd5b50505060009056fea26469706673582212204b66603499437a61b730aa07bac49791b452964b84feb74e607ee60fefc24cbb64736f6c63430008170033