# Types

## Market Rule

Market Rule defines the rules on which asset's can be used as collateral and can be borrowed. For each asset the rules are defined by the i-th entry of the vector where i is the asset's AssetId. If the entry in None then the asset can not be used as collateral nor borrowed.

## Decimal Multiplier

Decimal Multiplier defines the number that represents one token. For example if a PSP22 token has 6 decimals it means that the one token is represented by the number 1_000_000, in such case the Decimal Multiplier is 1_000_000.

## Interest Rate Model

Interest Rate Model defines the parameters that are used for calculation of the current borrow rate (which doesn't include fees). It is 7 numbers defining the target rate per millisecond multiplied by 10^18 at utilization rates : 68%, 84%, 92%, 96%, 98%, 99%, 100%.

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