# Liquidating a Borrower

Liquidations are vital for Cryndex, as they protect the protocol's integrity if a loan becomes undercollateralised. Liquidators are motivated by bonus tokens obtained from borrowers. Each collateral token offers a unique bonus incentive. You can check the bonus for each collateral token by using the `getLiquidationBonus(address token)` on the treasury.

In order to liquidate a borrower, a liquidator must use the liquidate function on the treasury:

```solidity
/// @notice Computes liquidation parameters and updates debt position
/// @param token Collateral token to seize
/// @param asset Debt asset to repay
/// @param debtToCover Amount of asset to repay
/// @param account Account to liquidate
/// @return Amount Liquidated
function liquidate(
    address token,
    address asset,
    uint256 debtToCover,
    address account
) external returns (uint256);
```

A liquidator can pay back a maximum of 50% of a borrower's debt in exchange for a 1:1 ratio of the borrowers collateral. A borrower can only be liquidated if their health factor drops below 1, you can check the health factor of a borrower by using the `calculateHealthFactor(address account)` function on the treasury.

If you want to check the collateral balance of an account you can use the `getCollateralBalance(address account, address token)` function and to check the debt balance you can use the `getDebtBalance(address account, address asset)` function. Both of these functions exist on the treasury.


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