Redemptions

clear debt on risky vaults by exchanging USDA for collateral assets

Redemptions are a new Vault mechanic introduced with the deployment of Arkadiko V2.

A redemption is the act of using USDA to pay off the debt of an open Arkadiko Vault and receiving equivalent collateral asset tokens in return. This mechanism enables anyone to provide stability to USDA by buying it on the open market under 1 USD and subsequently exchanging it for 1 USD worth of collateral in an open Arkadiko Vault.

This provides an economic incentive to perform this type of arbitrage, making sure that USDA does not fall too far in value below 1 USD.

Redemptions are not a new idea and have been successfully used in Liquity as means to provide peg stability.

Inner workings

Arkadiko Vaults are ordered by collateralization ratio which is the ratio between the value of your assets in your Vault and your active debt.

Some Vaults are more healthy than others, meaning that they have more room for their collateral assets to decrease before being flagged for liquidation. In general, our protocol tries to avoid liquidations as much as possible, as they incur a hefty penalty of 10% to the Vault owner’s assets.

Redemptions are permissionless in the sense that anyone can trigger a redemption. The process goes as follows:

  1. A redeemer queries the current least healthy Vault and receives back the amount of debt in that Vault.

  2. The redeemer then uses USDA to pay off the debt in the Vault.

  3. USDA is always valued at 1 USD by the protocol and based on the oracle price of the asset, the correct amount of collateral is taken from the Vault and sent to the redeemer.

  4. That Vault has now become more healthy as it has its debt paid off in exchange for collateral assets.

Note that a Redemption can also be partial and does not have to pay off all the debt in the Vault.

Ofcourse, this process of Redemptions is only profitable for the redeemer if he is able to purchase USDA somewhere for less than 1 USD. For example, a redeemer would take 1000 USD worth of STX and uses it to buy USDA. He then triggers a Redemption and receives back more than 1000 USD worth of STX, generating a small profit. It is possible because somewhere, there exists a market, currently in the form of Liquidity Pools where USDA is purchasable for less than 1 USD.

Now in order not to enter a negative spiral of Redemptions, a dynamic Redemption fee is used. This fee starts at 0.5% and increases each time a Redemption takes place. If no Redemptions have taken place for some time, the fee decays slowly back to its initial base fee of 0.5%.

Usually, the knowledge that a Redemption mechanism exists is enough for users to confide in the system and not sell USDA at a serious loss, as they know it will be arbitraged to 1 USD again. So the presence of Redemptions means that they will be needed less often than if there was a non-protocol native way to arbitrage USDA. Redemptions are a soft-peg mechanism which should be needed less often than the hard-peg mechanisms such as buying and selling in liquidity pools.

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