TwoKinksInterestRateModel

TwoKinksInterestRateModel has three utilization segments separated by KINK_1 and KINK_2. Signed slope inputs allow a segment to rise or fall, while the returned borrow rate is floored at zero.

Constructor

constructor(
    int256 baseRatePerYear,
    int256 multiplierPerYear,
    int256 kink1,
    int256 multiplier2PerYear,
    int256 baseRate2PerYear,
    int256 kink2,
    int256 jumpMultiplierPerYear,
    bool timeBased,
    uint256 blocksPerYear
)

baseRatePerYear and baseRate2PerYear cannot be negative, and the kinks must satisfy 0 < kink1 < kink2. Annual rates are divided by the implementation’s slots/year value and stored in immutable per-block-or-second fields. A time-based deployment requires blocksPerYear = 0; a block-based deployment requires a nonzero value.

Public parameters

• BASE_RATE_PER_BLOCK_OR_SECOND, MULTIPLIER_PER_BLOCK_OR_SECOND, and KINK_1
• BASE_RATE_2_PER_BLOCK_OR_SECOND, MULTIPLIER_2_PER_BLOCK_OR_SECOND, and RATE_1
• KINK_2, JUMP_MULTIPLIER_PER_BLOCK_OR_SECOND, and RATE_2
• inherited isTimeBased() and blocksOrSecondsPerYear()

All rate and utilization values use 1e18 mantissa scaling. RATE_1 and RATE_2 are precomputed constructor values used to keep the three curve segments continuous.

Rate functions

function getBorrowRate(
    uint256 cash,
    uint256 borrows,
    uint256 reserves,
    uint256 badDebt
) external view returns (uint256);

function getSupplyRate(
    uint256 cash,
    uint256 borrows,
    uint256 reserves,
    uint256 reserveFactorMantissa,
    uint256 badDebt
) public view returns (uint256);

function utilizationRate(
    uint256 cash,
    uint256 borrows,
    uint256 reserves,
    uint256 badDebt
) public pure returns (uint256);

The model is immutable. Identify the exact deployed address and constructor values returned by a market’s interestRateModel(); a model family name is not enough to reproduce the curve.