# TwoKinksInterestRateModel ## TwoKinksInterestRateModel An interest rate model with two different slope increase or decrease each after a certain utilization threshold called **kink** is reached. ## Solidity API #### MULTIPLIER\_PER\_BLOCK The multiplier of utilization rate per block that gives the slope 1 of the interest rate scaled by EXP\_SCALE ```solidity int256 MULTIPLIER_PER_BLOCK ``` *** #### BASE\_RATE\_PER\_BLOCK The base interest rate per block which is the y-intercept when utilization rate is 0 scaled by EXP\_SCALE ```solidity int256 BASE_RATE_PER_BLOCK ``` *** #### KINK\_1 The utilization point at which the multiplier2 is applied ```solidity int256 KINK_1 ``` *** #### MULTIPLIER\_2\_PER\_BLOCK The multiplier of utilization rate per block that gives the slope 2 of the interest rate scaled by EXP\_SCALE ```solidity int256 MULTIPLIER_2_PER_BLOCK ``` *** #### BASE\_RATE\_2\_PER\_BLOCK The base interest rate per block which is the y-intercept when utilization rate hits KINK\_1 scaled by EXP\_SCALE ```solidity int256 BASE_RATE_2_PER_BLOCK ``` *** #### RATE\_1 The maximum kink interest rate scaled by EXP\_SCALE ```solidity int256 RATE_1 ``` *** #### KINK\_2 The utilization point at which the jump multiplier is applied ```solidity int256 KINK_2 ``` *** #### JUMP\_MULTIPLIER\_PER\_BLOCK The multiplier of utilization rate per block that gives the slope 3 of interest rate scaled by EXP\_SCALE ```solidity int256 JUMP_MULTIPLIER_PER_BLOCK ``` *** #### RATE\_2 The maximum kink interest rate scaled by EXP\_SCALE ```solidity int256 RATE_2 ``` *** #### constructor Construct an interest rate model ```solidity constructor(int256 baseRatePerYear_, int256 multiplierPerYear_, int256 kink1_, int256 multiplier2PerYear_, int256 baseRate2PerYear_, int256 kink2_, int256 jumpMultiplierPerYear_) public ``` **Parameters** | Name | Type | Description | | ----------------------- | ------ | -------------------------------------------------------------------------------------------------------------- | | baseRatePerYear\_ | int256 | The approximate target base APR, as a mantissa (scaled by EXP\_SCALE) | | multiplierPerYear\_ | int256 | The rate of increase or decrease in interest rate wrt utilization (scaled by EXP\_SCALE) | | kink1\_ | int256 | The utilization point at which the multiplier2 is applied | | multiplier2PerYear\_ | int256 | The rate of increase or decrease in interest rate wrt utilization after hitting KINK\_1 (scaled by EXP\_SCALE) | | baseRate2PerYear\_ | int256 | The additional base APR after hitting KINK\_1, as a mantissa (scaled by EXP\_SCALE) | | kink2\_ | int256 | The utilization point at which the jump multiplier is applied | | jumpMultiplierPerYear\_ | int256 | The multiplier after hitting KINK\_2 | *** #### getBorrowRate Calculates the current borrow rate per slot (block) ```solidity function getBorrowRate(uint256 cash, uint256 borrows, uint256 reserves) external view returns (uint256) ``` **Parameters** | Name | Type | Description | | -------- | ------- | ------------------------------------ | | cash | uint256 | The amount of cash in the market | | borrows | uint256 | The amount of borrows in the market | | reserves | uint256 | The amount of reserves in the market | **Return Values** | Name | Type | Description | | ---- | ------- | -------------------------------------------------------------------------------- | | \[0] | uint256 | The borrow rate percentage per slot (block) as a mantissa (scaled by EXP\_SCALE) | *** #### getSupplyRate Calculates the current supply rate per slot (block) ```solidity function getSupplyRate(uint256 cash, uint256 borrows, uint256 reserves, uint256 reserveFactorMantissa) public view virtual returns (uint256) ``` **Parameters** | Name | Type | Description | | --------------------- | ------- | ----------------------------------------- | | cash | uint256 | The amount of cash in the market | | borrows | uint256 | The amount of borrows in the market | | reserves | uint256 | The amount of reserves in the market | | reserveFactorMantissa | uint256 | The current reserve factor for the market | **Return Values** | Name | Type | Description | | ---- | ------- | -------------------------------------------------------------------------------- | | \[0] | uint256 | The supply rate percentage per slot (block) as a mantissa (scaled by EXP\_SCALE) | *** #### utilizationRate Calculates the utilization rate of the market: `borrows / (cash + borrows - reserves)` ```solidity function utilizationRate(uint256 cash, uint256 borrows, uint256 reserves) public pure returns (uint256) ``` **Parameters** | Name | Type | Description | | -------- | ------- | ------------------------------------ | | cash | uint256 | The amount of cash in the market | | borrows | uint256 | The amount of borrows in the market | | reserves | uint256 | The amount of reserves in the market | **Return Values** | Name | Type | Description | | ---- | ------- | ----------------------------------------------------------- | | \[0] | uint256 | The utilization rate as a mantissa between \[0, EXP\_SCALE] | *** --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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