The following readme describes all the functions and their parameters exposed by the partitionedLinearInterestRateModel class of the K2 SDK. This sub-class contains all the important functions from the K2 Partitioned Linear Interest Rate Model contract of the K2 Lending protocol.

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getUtilizationRatio function

Get the max utilisation percentage of the pool at 100% utilisation.

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Input Parameters

assumedLiquidity: Total liquidity in the pool, including available and borrowed funds
borrowedLiquidity: Liquidity borrowed from the pool
borrowAmount: Borrow amount

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Using getUtilizationRatio function

await sdk.partitionedLinearInterestRateModel.getUtilizationRatio(assumedLiquidity, borrowedLiquidity, borrowAmount);

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Return Parameters

Returns the max utilization percentage.

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maxSlashableAmountPerLivenessUpper function

Upper bound for the ETH slashing amount that can take place for a given liveness event.

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Input Parameters

assumedLiquidity: Total liquidity in the pool, including available and borrowed funds
borrowedLiquidity: Liquidity borrowed from the pool
borrowAmount: Borrow amount

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Using maxSlashableAmountPerLivenessUpper function

await sdk.partitionedLinearInterestRateModel.maxSlashableAmountPerLivenessUpper(assumedLiquidity, borrowedLiquidity, borrowAmount);

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Return Parameters

Returns the max ETH slashing amount possible for a given liveness event.

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maxSlashableAmountPerCorruptionUpper function

Upper bound for the ETH slashing amount that can take place for a given corruption event.

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Input Parameters

assumedLiquidity: Total liquidity in the pool, including available and borrowed funds
borrowedLiquidity: Liquidity borrowed from the pool
borrowAmount: Borrow amount

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Using maxSlashableAmountPerCorruptionUpper function

await sdk.partitionedLinearInterestRateModel.maxSlashableAmountPerCorruptionUpper(assumedLiquidity, borrowedLiquidity, borrowAmount);

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Return Parameters

Returns the max ETH slashing amount possible for a given corruption event.

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getInterestRate function

Get the current interest rate based on assumed (total) and available liquidity.

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Input Parameters

assumedLiquidity: Total liquidity in the pool, including available and borrowed funds
borrowedLiquidity: Liquidity borrowed from the pool
borrowAmount: Borrow amount
maxSlashableAmountPerLiveness: Maximum slashable amount per liveness
maxSlashableAmountPerCorruption: Maximum slashable amount per corruption

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Using getInterestRate function

await sdk.partitionedLinearInterestRateModel.getInterestRate(assumedLiquidity, borrowedLiquidity, borrowAmount, maxSlashableAmountPerLiveness, maxSlashableAmountPerCorruption);

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Return Parameters

Returns the current interest rate in RAY format.

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getMaxBorrowableAmount function

Get the expected max borrow amount for SBP using interest.

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Input Parameters

interestAmount: The interest amount
currentBorrowAmount: Curent debt principal
maxSlashableAmountPerLiveness: Maximum slashable amount per liveness
maxSlashableAmountPerCorruption: Maximum slashable amount per corruption
duration: Borrow duration

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Using getMaxBorrowableAmount function

await sdk.partitionedLinearInterestRateModel.getMaxBorrowableAmount(interestAmount, currentBorrowAmount, maxSlashableAmountPerLiveness, maxSlashableAmountPerCorruption, duration);

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Return Parameters

Returns the expected max borrow amount using interest.

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getExpectedInterest function

Get the expected interest accrued over a duration, assuming interest rate doesn’t change after the initial borrow.

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Input Parameters

newBorrowAmount: The debt principal to compute interest for
currentBorrowAmount: Curent debt principal
maxSlashableAmountPerLiveness: Maximum slashable amount per liveness
maxSlashableAmountPerCorruption: Maximum slashable amount per corruption
duration: Borrow duration

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Using getExpectedInterest function

await sdk.partitionedLinearInterestRateModel.getExpectedInterest(newBorrowAmount, currentBorrowAmount, maxSlashableAmountPerLiveness, maxSlashableAmountPerCorruption, duration);

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Return Parameters

Returns the expected interest accrued over a duration.

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getBorrowableAmountBounds function

Get the upper and lower boundaries on the given borrow amount.

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Input Parameters

currentBorrowAmount: Curent debt principal
maxSlashableAmountPerLiveness: Maximum slashable amount per liveness
maxSlashableAmountPerCorruption: Maximum slashable amount per corruption

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Using getBorrowableAmountBounds function

await sdk.partitionedLinearInterestRateModel.getBorrowableAmountBounds(currentBorrowAmount, maxSlashableAmountPerLiveness, maxSlashableAmountPerCorruption);

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Return Parameters

Returns the lower and upper bounds on new borrow amount.

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