---
# System prepended metadata

title: HAI New Collateral Parameters
tags: [guide, HAI, public]

---

## Parameters Needed for New Collaterals

### General

- Collateral Name
- Contract Address of collateral token

### [Collateral Auction House](https://docs.letsgethai.com/detailed/auctions/cah.html)
- **`minimumBid`** - Sets the minimum system coin bid required to participate in collateral auctions.
- **`minDiscount`** - Defines the initial discount rate at which auctions commence.
- **`maxDiscount`** - Sets the upper limit for the discount rate that auctions can achieve.
- **`perSecondDiscountUpdateRate`** - Determines the rate at which the discount increases for each second the auction is live.

### Oracle / Price Feed
- UNI v3 oracle or chainlink aggregator compatible. (e.g. redstone classic is compatible with chainlink aggregator interface)


### [SAFEEngine](https://docs.letsgethai.com/detailed/modules/safe_engine.html)
- **`debtCeiling`** - The max amount of debt that can be generated globally by the collateral type.
- **`debtFloor`** - The min amount of debt that can be generated by a SAFE of that collateral type.


### [Oracle Relayer](https://docs.letsgethai.com/detailed/modules/oracle_relayer.html)
- **`safetyCRatio`** - Ratio applied to the collateral price to define the safety price.
- **`liquidationCRatio`** - Ratio applied to the collateral price to define the liquidation price.

### [TaxCollector](https://docs.letsgethai.com/detailed/modules/tax_collector.html)
 - **`stabilityFee`** - Stability fee applied only to the collateral type.

### [LiquidationEngine](https://docs.letsgethai.com/detailed/modules/liq_engine.html)
- **`liquidationPenalty`** - Penalty applied to the debt of the SAFE that is being liquidated. This penalty represents an excess in the amount of debt that the collateral auction needs to cover.
- **`liquidationQuantity`** - Max amount of debt that can be liquidated in each liquidation.