Interest Rate Strategy
The InterestRateStrategy contract manages loan interest rates with theses being dependent on the utilisation of liquidity within the lending pool reserve
Methods
calculateInterestRate()
function calculateInterestRate(uint256 reserveId, uint256 availableLiquidity, uint256 totalStableDebt, uint256 totalVariableDebt, uint256 averageStableBorrowRate, uint256 reserveFactor)
Calculates the interest rate depending on the reserve's state and configurations.
| Parameter Name | Type | Description |
|---|---|---|
| uint256 | id of the targeted reserve |
| uint256 | amount of liquidity available in the reserve |
| uint256 | total amount of stable debt |
| uint256 | total amount of variable debt |
| uint256 | average stable borrow rate |
| uint256 | reserve factor for the reserve, i.e. percentage of yield going to the protocol |
Returns
| Parameter Name | Type | Description |
|---|---|---|
| uint256 | liquidity rate of the reserve |
| uint256 | stable borrow interest rate |
| uint256 | variable borrow interest rate |
calculateInterestRates()
function calculateInterestRate(uint256 reserveId, address asset, address fToken, uint256 liquidityAdded, uint256 liquidityTaken, uint256 totalStableDebt, uint256 totalVariableDebt, uint256 averageStableBorrowRate, uint256 reserveFactor)
| Parameter Name | Type | Description |
|---|---|---|
| uint256 | id of the targeted reserve |
| address | address of the currency |
| address | address of the fToken proxy |
| uint256 | amount of liquidity added |
| uint256 | amount of liquidity taken |
| uint256 | total amount of stable debt |
| uint256 | total amount of variable debt |
| uint256 | average stable borrow rate |
| uint256 | reserve factor for the reserve, i.e. percentage of yield going to the protocol |
Calculates the interest rate depending on the reserve's state and configurations.
Returns
| Parameter Name | Type | Description |
|---|---|---|
| uint256 | liquidity rate of the reserve |
| uint256 | stable borrow interest rate |
| uint256 | variable borrow interest rate |
View Methods
variableRateSlope1()
function variableRateSlope1()
Returns slope1 of the variable interest rate.
variableRateSlope2()
function variableRateSlope2()
Returns slope2 of the variable interest rate.
stableRateSlope1()
function stableRateSlope1()
Returns slope1 of the stable interest rate.
stableRateSlope2()
function stableRateSlope2()
Returns slope2 of the stable interest rate.
baseVariableBorrowRate()
function baseVariableBorrowRate()
Returns the base variable borrow rate.
maxVariableBorrowRate()
function maxVariableBorrowRate()
Returns the max variable borrow rate.
ABI
Interest Rate Strategy ABI
{
"abi": [
{
"inputs": [
{
"internalType": "contract IAddressProvider",
"name": "addressprovider_",
"type": "address"
},
{
"internalType": "uint256",
"name": "optimalUtilizationRate_",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "baseVariableBorrowRate_",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "variableRateSlope1_",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "variableRateSlope2_",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "stableRateSlope1_",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "stableRateSlope2_",
"type": "uint256"
}
],
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"inputs": [],
"name": "EXCESS_UTILIZATION_RATE",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "OPTIMAL_UTILIZATION_RATE",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "addressProvider",
"outputs": [
{
"internalType": "contract IAddressProvider",
"name": "",
"type": "address"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "baseVariableBorrowRate",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"internalType": "uint256",
"name": "reserveId",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "availableLiquidity",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "totalStableDebt",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "totalVariableDebt",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "averageStableBorrowRate",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "reserveFactor",
"type": "uint256"
}
],
"name": "calculateInterestRate",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "",
"type": "uint256"
},
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{
"inputs": [
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"name": "reserveId",
"type": "uint256"
},
{
"internalType": "address",
"name": "asset",
"type": "address"
},
{
"internalType": "address",
"name": "fToken",
"type": "address"
},
{
"internalType": "uint256",
"name": "liquidityAdded",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "liquidityTaken",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "totalStableDebt",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "totalVariableDebt",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "averageStableBorrowRate",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "reserveFactor",
"type": "uint256"
}
],
"name": "calculateInterestRates",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
},
{
"internalType": "uint256",
"name": "",
"type": "uint256"
},
{
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"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "maxVariableBorrowRate",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "stableRateSlope1",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "stableRateSlope2",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "variableRateSlope1",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
},
{
"inputs": [],
"name": "variableRateSlope2",
"outputs": [
{
"internalType": "uint256",
"name": "",
"type": "uint256"
}
],
"stateMutability": "view",
"type": "function"
}
],
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"methodIdentifiers": {
"EXCESS_UTILIZATION_RATE()": "17319873",
"OPTIMAL_UTILIZATION_RATE()": "a15f30ac",
"addressProvider()": "2954018c",
"baseVariableBorrowRate()": "b2589544",
"calculateInterestRate(uint256,uint256,uint256,uint256,uint256,uint256)": "9b9c5b49",
"calculateInterestRates(uint256,address,address,uint256,uint256,uint256,uint256,uint256,uint256)": "7d8a872d",
"maxVariableBorrowRate()": "643d41f2",
"stableRateSlope1()": "0bdf953f",
"stableRateSlope2()": "ccab01a3",
"variableRateSlope1()": "7b832f58",
"variableRateSlope2()": "65614f81"
},
"rawMetadata": "{\"compiler\":{\"version\":\"0.8.16+commit.07a7930e\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IAddressProvider\",\"name\":\"addressprovider_\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"optimalUtilizationRate_\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"baseVariableBorrowRate_\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"variableRateSlope1_\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"variableRateSlope2_\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"stableRateSlope1_\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"stableRateSlope2_\",\"type\":\"uint256\"}],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"inputs\":[],\"name\":\"EXCESS_UTILIZATION_RATE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"OPTIMAL_UTILIZATION_RATE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"addressProvider\",\"outputs\":[{\"internalType\":\"contract IAddressProvider\",\"name\":\"\",\"type\":\"address\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"baseVariableBorrowRate\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"reserveId\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"availableLiquidity\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"totalStableDebt\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"totalVariableDebt\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"averageStableBorrowRate\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"reserveFactor\",\"type\":\"uint256\"}],\"name\":\"calculateInterestRate\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"reserveId\",\"type\":\"uint256\"},{\"internalType\":\"address\",\"name\":\"asset\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"fToken\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"liquidityAdded\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"liquidityTaken\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"totalStableDebt\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"totalVariableDebt\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"averageStableBorrowRate\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"reserveFactor\",\"type\":\"uint256\"}],\"name\":\"calculateInterestRates\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"maxVariableBorrowRate\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"stableRateSlope1\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"stableRateSlope2\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"variableRateSlope1\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"variableRateSlope2\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"author\":\"FluidNFT*\",\"details\":\"The model of interest rate is based on 2 slopes, one before the `OPTIMAL_UTILIZATION_RATE` point of utilization and another from that one to 100%\",\"kind\":\"dev\",\"methods\":{\"calculateInterestRate(uint256,uint256,uint256,uint256,uint256,uint256)\":{\"details\":\"Calculates the interest rates depending on the asset reserve's state and configurations.\",\"params\":{\"availableLiquidity\":\"The liquidity available in the corresponding fToken\",\"averageStableBorrowRate\":\"The weighted average of all the stable rate loans\",\"reserveFactor\":\"The reserve portion of the interest that goes to the treasury of the market\",\"totalStableDebt\":\"The total borrowed from the reserve at a stable rate\",\"totalVariableDebt\":\"The total borrowed from the reserve at a variable rate\"},\"returns\":{\"_0\":\"The liquidity rate, the stable borrow rate and the variable borrow rate*\"}},\"calculateInterestRates(uint256,address,address,uint256,uint256,uint256,uint256,uint256,uint256)\":{\"details\":\"Calculates the interest rates depending on the reserve's state and configurations\",\"params\":{\"asset\":\"The address of the reserve asset\",\"fToken\":\"The address of the reserve fToken\",\"liquidityAdded\":\"The liquidity added during the operation\",\"liquidityTaken\":\"The liquidity taken during the operation\",\"reserveFactor\":\"The reserve portion of the interest that goes to the treasury of the market\",\"totalStableDebt\":\"The total borrowed from the reserve a stable rate\",\"totalVariableDebt\":\"The total borrowed from the reserve at a variable rate\"},\"returns\":{\"_0\":\"The liquidity rate, the stable borrow rate and the variable borrow rate*\"}}},\"stateVariables\":{\"EXCESS_UTILIZATION_RATE\":{\"details\":\"This constant represents the excess utilization rate above the optimal. 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