Borrowing

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Borrowing
Why would I use Teddy Cash for borrowing?
The Teddy Cash protocol offers interest-free loans and is more capital efficient than other borrowing systems (i.e. less collateral is needed for the same loan). Instead of selling AVAX to have liquid funds, you can use the protocol to lock up your AVAX, borrow against the collateral to withdraw TSD, and then repay your loan at a future date.
For example: Borrowers speculating on future AVAX price increases can use the protocol to leverage their AVAX positions up to 11 times, increasing their exposure to price changes. This is possible because TSD can be borrowed against AVAX, sold on the open market to purchase more AVAX — rinse and repeat.*
*Note: This is not a recommendation for how to use Teddy Cash. Leverage can be risky and should be used only by those with experience.
What do you mean by collateral?
Collateral is any asset which a borrower must provide to take out a loan, acting as a security for the debt. Currently, Teddy Cash only supports AVAX as collateral.
Is AVAX the only collateral accepted by Teddy Cash? 
Yes, AVAX is the only collateral type accepted by Teddy Cash.
How can the protocol offer interest-free borrowing?
The protocol charges one-time borrowing and redemption fees that algorithmically adjust based on the last redemption time. For example: If more redemptions are happening (which means TSD is likely trading at less than 1 USD), the borrowing fee would continue to increase, discouraging borrowing.
Other systems (e.g. MakerDAO) require variable interest rates to make borrowing more or less favorable, but do so implicitly since borrowers would not feel the impact upfront. Given that this also needs to be managed via governance, Teddy Cash instead opts for a fully decentralized and direct feedback mechanism via one-off fees.
How can I borrow with Teddy Cash?
To borrow you must open a Trove and deposit a certain amount of collateral (AVAX) to it. Then you can draw TSD up to a collateral ratio of 110%. A minimum debt of 2,000 TSD is required.
What is a Trove?
A Trove is where you take out and maintain your loan. Each Trove is linked to an Avalanche address and each address can have just one Trove. If you are familiar with Vaults or CDPs from other platforms, Troves are similar in concept.
Troves maintain two balances: one is an asset (AVAX) acting as collateral and the other is a debt denominated in TSD. You can change the amount of each by adding collateral or repaying debt. As you make these balance changes, your Trove’s collateral ratio changes accordingly.
You can close your Trove at any time by fully paying off your debt.
Do I have to pay fees as a borrower?
Every time you draw TSD from your Trove, a one-off borrowing fee is charged on the drawn amount and added to your debt. Please note that the borrowing fee is variable (and determined algorithmically) and has a minimum value of 0.5% under normal operation. The fee is 0% during Recovery Mode. A 200 TSD Liquidation Reserve charge will be applied as well, but returned to you upon repayment of debt.
How is the borrowing fee calculated?
The borrowing fee is added to the debt of the Trove and is given by a baseRate . The fee rate is confined to a range between 0.5% and 5% and is multiplied by the amount of liquidity drawn by the borrower.
For example: The borrowing fee stands at 0.5% and the borrower draws 4,000 TSD from his open Trove. Being charged a fee of 18.91 TSD, the borrower will obtain 3,781.09 TSD after the Liquidation Reserve and issuance fee are deducted.
When do I need to pay my loan back?
Loans issued by the protocol do not have a repayment schedule. You can leave your Trove open and repay your debt any time, as long as you maintain a collateral ratio of at least 110%.
What is the collateral ratio?
This is the ratio between the Dollar value of the collateral in your Trove and its debt in TSD. The collateral ratio of your Trove will fluctuate over time as the price of AVAX changes. You can influence the ratio by adjusting your Trove’s collateral and/or debt — i.e. adding more AVAX collateral or paying off some of your debt.
For example: Let’s say the current price of AVAX is $3,000 and you decide to deposit 10 AVAX. If you borrow 10,000 TSD, then the collateral ratio for your Trove would be 300%.
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If you instead took out 25,000 TSD that would put your ratio at 120%.
What is the minimum collateral ratio (MCR) and the "recommended" collateral ratio?
The minimum collateral ratio (or MCR for short) is the lowest ratio of debt to collateral that will not trigger a liquidation under normal operations (aka Normal Mode). This is a protocol parameter that is set to 110%. So if your Trove has a debt 10,000 TSD, you would need at least $11,000 worth of AVAX posted as collateral to avoid being liquidated.
To avoid liquidation during Recovery Mode, it is recommended to keep ratio comfortably above 150% (e.g. 200% or better 250%).
What happens if my Trove is liquidated?
You lose your collateral as your debt is paid off through liquidation, i.e. you will no longer be able to retrieve your collateral by repaying your debt. A liquidation thus results in a net loss of 9.09% (= 100% * 10 / 110) of your collateral’s Dollar value.
What is the Liquidation Reserve?
When you open a Trove and draw a loan, 200 TSD is set aside as a way to compensate gas costs for the transaction sender in the event your Trove being liquidated. The Liquidation Reserve is fully refundable if your Trove is not liquidated, and is given back to you when you close your Trove by repaying your debt. The Liquidation Reserve counts as debt and is taken into account for the calculation of a Trove's collateral ratio, slightly increasing the actual collateral requirements.
What happens if my Trove is redeemed against?
When TSD is redeemed, the AVAX provided to the redeemer is allocated from the Trove(s) with the lowest collateral ratio (even if it is above 110%). If at the time of redemption you have the Trove with the lowest ratio, you will give up some of your collateral, but your debt will be reduced accordingly.
The USD value by which your AVAX collateral is reduced corresponds to the nominal TSD amount by which your Trove’s debt is decreased. You can think of redemptions as if somebody else is repaying your debt and retrieving an equivalent amount of your collateral. As a positive side effect, redemptions improve the collateral ratio of the affected Troves, making them less risky.
Redemptions that do not reduce your debt to 0 are called partial redemptions, while redemptions that fully pay off a Trove’s debt are called full redemptions. In such a case, your Trove is closed, and you can claim your collateral surplus and the Liquidation Reserve at any time.
Let’s say you own a Trove with 2 AVAX collateralized and a debt of 3,200 TSD. The current price of AVAX is $2,000. This puts your collateral ratio (CR) at 125% (= 100% * (2 * 2,000) / 3,200). Let’s imagine this is the lowest CR in the Teddy Cash system and look at two examples of a partial redemption and a full redemption:
Example of a partial redemption
Somebody redeems 1,200 TSD for 0.6 AVAX and thus repays 1,200 TSD of your debt, reducing it from 3,200 TSD to 2,000 TSD. In return, 0.6 AVAX, worth $1,200, is transferred from your Trove to the redeemer. Your collateral goes down from 2 to 1.4 AVAX, while your collateral ratio goes up from 125% to 140% (= 100% * (1.4 * 2,000) / 2,000).
Example of a full redemption
Somebody redeems 6,000 TSD for 3 AVAX. Given that the redeemed amount is larger than your debt minus 200 TSD (set aside as a Liquidation Reserve), your debt of 3,200 TSD is entirely cleared and your collateral gets reduced by $3,000 of AVAX, leaving you with a collateral of0.5 AVAX (= 2 - 3,000 / 2,000).
How can you offer a collateral ratio as low as 110%?
By making liquidation instantaneous and more efficient, Teddy Cash needs less collateral to provide the same security level as similar protocols that rely on lengthy auction mechanisms to sell off collateral in liquidations.
How can I take advantage of leverage?
You can sell the borrowed TSD on the market for AVAX and use the latter to top up the collateral of your Trove. That allows you to draw and sell more TSD, and by repeating the process you can reach the desired leverage ratio.
Assuming perfect price stability (1 TSD = $1), the maximum achievable leverage ratio is 11x. It is given by the formula:
maximum leverage ration=MCR(MCR−100%) maximum\ leverage  \ ration = \frac{MCR}{(MCR - 100\%)}
maximum leverage ration=(MCR−100%)MCR​
maximum leverage ratio MCR ​where MCR is the Minimum Collateral Ratio.
Why did the collateral and debt of my Trove increase without my intervention?
If Troves are liquidated and the Stability Pool is empty (or gets emptied due to the liquidation), every borrower will receive a portion of the liquidated collateral and debt as part of a redistribution process.
General
Stability Pool and Liquidations
Last modified 1yr ago
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Outline
Why would I use Teddy Cash for borrowing?
What do you mean by collateral?
Is AVAX the only collateral accepted by Teddy Cash?
How can the protocol offer interest-free borrowing?
How can I borrow with Teddy Cash?
What is a Trove?
Do I have to pay fees as a borrower?
How is the borrowing fee calculated?
When do I need to pay my loan back?
What is the collateral ratio?
What is the minimum collateral ratio (MCR) and the "recommended" collateral ratio?
What happens if my Trove is liquidated?
What is the Liquidation Reserve?
What happens if my Trove is redeemed against?
How can you offer a collateral ratio as low as 110%?
How can I take advantage of leverage?
Why did the collateral and debt of my Trove increase without my intervention?