# FAQs 

### Are Rates Fixed or Variable?

Both interest and savings rates are configurable parameters via governance, and both are variable throughout the course of a CDP or staked position's lifetime. Changes do not apply retroactively however, only after they are effected on-chain.

### Why are Only Some Wallets "Officially Supported"?

These wallets (Lace, Eternl, Tokeo) have been tested most thoroughly, and will most likely provide the smoothest user experience on the platform. If you have another wallet you prefer, it will appear as an option on the wallet connection widget.

### What does this "Redundant Collateral" Warning Mean?

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In addition to the colllateral weight parameters which influence their borrowing powers, each CNT has a **"Maximum Proportion"** parameter which indicates the maximum percentage of the **debt** that can be collateralised by that asset (see [Synthetic Parameters](/how-to-use-butane/butane-basics/synthetic-parameters.md)). Values deposited over the maximum amount (which can be roughly determined by multiplying $$\text{MP} \cdot \text{W}$$ by the current debt value in USD, where $$\text{MP}$$ and $$\text{W}$$ are the max proportion and weight parameters, respectively) aren't included in health factor calculations, however users can still deposit excess collateral if desired. The "rebalance" button will set the collateral amounts to be the current max values based on this calculation.


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