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QAdmin

Introduction​

The QAdmin contract contains meta-information on all supported Assets and available FixedRateMarkets for borrowing and lending for each Asset. An ERC20 Asset on Qonstant is (potentially) enabled for two purposes:

  1. For being supplied as collateral. The value of the collateral is determined by its USD value (as determined by on-chain Chainlink oracle), MULTIPLIED by its collateralFactor (a value between [0,1]). Generally, large or liquid tokens will have higher collateralFactors while small or illiquid tokens will have lower collateralFactors. A collateralFactor of zero implies that the Asset is not supported as a collateral token.

  2. For creating FixedRateMarkets for borrowing and lending the ERC20. The value of borrows of the ERC20 is determined by its USD value (as determined by the on-chain Chainlink oracle), DIVIDED by its marketFactor (a value between [0,1]). Generally, large or liquidt tokens will have higher marketFactors while small or illiquid tokens will have lower marketFactors.

Assets​

function assets(address token) external view returns(Asset memory)

Returns the Asset data for any given ERC20. An Asset is a struct with the following fields:

struct Asset {
    bool isEnabled;
    bool isYieldBearing;
    address underlying;
    address oracleFeed;
    uint collateralFactor;
    uint marketFactor;
    uint[] maturities;
}
  • isEnabled : True if the ERC20 is enabled on Qonstant, false otherwise.
  • isYieldBearing: Indicates if the Asset is a yield-bearing token.
  • underlying: The address of the underlying ERC20 token.
  • oracleFeed: The corresponding Chainlink oracle address for determining the value of the Asset.
  • collateralFactor: Used for discounting the value of collateral supplied in the ERC20. Value between [0,1], scaled by 1e8.
  • marketFactor: Used for applying a premium on the value of borrows of the ERC20. Value between [0,1], scaled by 1e8.
  • maturities: An iterable array of all the enabled maturities (UNIX timestamp in seconds) for the ERC20. An empty array implies there is no available FixedRateMarket for borrowing and lending this ERC20.

FixedRateMarket​

function fixedRateMarkets(address token, uint maturity) external view returns(address)

Returns the address of the FixedRateMarket. A FixedRateMarket is a self-contained smart contract that handles all borrowing and lending for a particular market. A FixedRateMarket is characterized by two fields:

  1. token: The underlying ERC20 token that can be borrowed or lent.
  2. maturity: The datetime (UNIX timestamp in seconds) after which borrows should be repaid, and when lendings may redeem their underlying.

Hence, for a particular ERC20, there may be multiple FixedRateMarkets corresponding to different maturity dates.