InterestRateModel

Given supply and demand values, the InterestRateModel is queried to calculate and return both fixed and variable rates. Contains parameters as state variables that are used to get the different points in the utilization curve for an asset. There's one InterestRateModel contract per enabled asset.

Public State Variables

fixedCurveA

function fixedCurveA() external view returns (uint256)

Scale factor of the fixed curve.

fixedCurveB

function fixedCurveB() external view returns (int256)

Origin intercept of the fixed curve.

fixedMaxUtilization

function fixedMaxUtilization() external view returns (uint256)

Asymptote of the fixed curve.

floatingCurveA

function floatingCurveA() external view returns (uint256)

Scale factor of the floating curve.

floatingCurveB

function floatingCurveB() external view returns (int256)

Origin intercept of the floating curve.

floatingMaxUtilization

function floatingMaxUtilization() external view returns (uint256)

Asymptote of the floating curve.

View Methods

fixedBorrowRate

function fixedBorrowRate(uint256 maturity, uint256 amount, uint256 borrowed, uint256 supplied, uint256 backupAssets) external view returns (uint256)

Gets the rate to borrow a certain amount at a certain maturity with supply/demand values in the fixed rate pool and assets from the backup supplier.

Parameters

Name	Type	Description
maturity	uint256	maturity date for calculating days left to maturity.
amount	uint256	the current borrow's amount.
borrowed	uint256	ex-ante amount borrowed from this fixed rate pool.
supplied	uint256	deposits in the fixed rate pool.
backupAssets	uint256	backup supplier assets.

Returns

Type	Description
uint256	rate of the fee that the borrower will have to pay (represented with 18 decimals).

floatingBorrowRate

function floatingBorrowRate(uint256 utilizationBefore, uint256 utilizationAfter) external view returns (uint256)

Returns the interest rate integral from utilizationBefore to utilizationAfter.

Minimum and maximum checks to avoid negative rate.

Parameters

Name	Type	Description
utilizationBefore	uint256	ex-ante utilization rate, with 18 decimals precision.
utilizationAfter	uint256	ex-post utilization rate, with 18 decimals precision.

Returns

Type	Description
uint256	the interest rate, with 18 decimals precision.