Setting additional collateral check params
There are two additional parameters that the user can optionally enable to improve the final collateral check:
- Collateral hints - the user can set an array of tokens that they want to prioritize during a collateral check. I.e., the tokens passed in
collateralHintswill be added first to the TWV in the same order as they are passed, and the rest are checked afterwards. Since collateral checks finish early once they determine thattwvUSD >= debtUSD, passing the tokens that contribute the most value to account's TWV can save a lot of gas, by minimizing the number of required price oracle calls. - Minimal health factor - by default, the collateral check verifies that the health factor is above 1. The user may pass any value higher than 1 (in bp) if they wish to ensure a particular threshold of account health.
This is done using the following ICreditFacadeV3Multicall function:
/// @notice Sets advanced collateral check parameters
/// @param collateralHints Optional array of token masks to check first to reduce the amount of computation
/// when known subset of account's collateral tokens covers all the debt
/// @param minHealthFactor Min account's health factor in bps in order not to revert, must be at least 10000
function setFullCheckParams(uint256[] calldata collateralHints, uint16 minHealthFactor) external;Usage
address[] memory collateralHints = new address[](2);
uint256 usdcMask = creditManager.getTokenMaskOrRevert(usdc);
uint256 linkMask = creditManager.getTokenMaskOrRevert(link);
collateralHints[0] = usdcMask;
collateralHints[1] = linkMask;
MultiCall[] memory calls = new MultiCall[](5);
calls[0] = MultiCall({
target: address(creditFacade),
callData: abi.encodeCall(ICreditFacadeV3Multicall.setFullCheckParams, (collateralHints, minHealthFactor))
});
/// Rest of the calls here
...
creditFacade.multicall(calls);