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
reserveId
uint256
id of the targeted reserve
availableLiquidity
uint256
amount of liquidity available in the reserve
totalStableDebt
uint256
total amount of stable debt
totalVariableDebt
uint256
total amount of variable debt
averageStableBorrowRate
uint256
average stable borrow rate
reserveFactor
uint256
reserve factor for the reserve, i.e. percentage of yield going to the protocol
Returns
Parameter Name
Type
Description
liquidityRate
uint256
liquidity rate of the reserve
stableBorrowRate
uint256
stable borrow interest rate
variableBorrowRate
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
reserveId
uint256
id of the targeted reserve
asset
address
address of the currency
fToken
address
address of the fToken proxy
liquidityAdded
uint256
amount of liquidity added
liquidityTaken
uint256
amount of liquidity taken
totalStableDebt
uint256
total amount of stable debt
totalVariableDebt
uint256
total amount of variable debt
averageStableBorrowRate
uint256
average stable borrow rate
reserveFactor
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
liquidityRate
uint256
liquidity rate of the reserve
stableBorrowRate
uint256
stable borrow interest rate
variableBorrowRate
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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"name": "",
"type": "uint256"
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],
"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"
},
{
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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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