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.
function fixedCurveA() external view returns (uint256)Scale factor of the fixed curve.
function fixedCurveB() external view returns (int256)Origin intercept of the fixed curve.
function fixedMaxUtilization() external view returns (uint256)Asymptote of the fixed curve.
function floatingCurveA() external view returns (uint256)Scale factor of the floating curve.
function floatingCurveB() external view returns (int256)Origin intercept of the floating curve.
function floatingMaxUtilization() external view returns (uint256)Asymptote of the floating curve.
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). |
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. |