Analysis of LSDFi leader Lybra Finance: How stable is it? What are the risks of "two-story nesting dolls"?

Original author: nobody (Twitter: @defioasis)

Original editor: Colin Wu

Note: This article is only for information sharing, and has no interest relationship with the project mentioned, and does not make any form of endorsement.

With the continuous rise of the ETH pledge rate and the LSD track becoming the largest TVL asset class, more income strategies around xETH, and the integration of DeFi in the LSD field with assets of 18.52 billion US dollars is becoming a new trend of community attention. According to Dune Analytics data, as of June 13, LSDfi TVL reached 420 million US dollars, only about 2.3% of LSD TVL; of which Lybra Finance accounted for 41.1%; on May 29, there were about 40 million; ETH/stETH inflows in USD set a new record for one-day growth, but their market share is declining as competitors join in. Lybra Finance LBR achieved an increase of more than 30; times in May, but after entering June, it may be affected by the sell-off of early profit earners, the market panic about contract issues and the macro environment, and it has fallen sharply from a high point. Investors should pay attention to risks. In fact, the establishment of a stable currency on LSD is the core of Lybra. This article will analyze Lybra Finance around the eUSD stable currency.

Core Business

Lybra Finance allows users to deposit ETH or stETH on the platform as collateral to mint the corresponding eUSD, and the liquidation line is 150%;, that is; $;1 eUSD is at least; $;1.5 equivalent of stETH as collateral. By holding the minted eUSD, users can earn interest income from it (just hold it, similar to a bank current deposit), which is supported by the LSD income generated by the deposited ETH/stETH, which means that when the user passes Lybra When depositing ETH/stETH to mint eUSD, the deposited ETH/stETH will be used to participate in LSD, and participation in LSD will be rewarded for verifying and maintaining the security of the Ethereum network. These rewards are generated in the form of stETH , which is converted into eUSD by the Lybra Finance protocol as interest income and distributed to users. As of June 13, the annualized interest income generated by holding eUSD is about 9.08%;. (Note: Depositing ETH on Lybra will be converted into stETH)

Protocol Income

Lybra does not charge fees for the minting and repayment of eUSD, and its main agreement income comes from the service fee charged after the income obtained from LSD, which is 1.5% of the total amount of eUSD in circulation; the annualized service fee (this service The fee will be accumulated once per second according to the current actual eUSD circulation), and the LSD income after deducting the service fee will be distributed to eUSD holders. The collected annualized service fee will be allocated to the LBR Staking Pool, and users can obtain 100% of the service fee by staking LBR into esLBR.

Stability

eUSD is actually an overcollateralized stablecoin.

(1;) At least; $;1.5;: $;1 equivalent of stETH as collateral, and supports the rigid redemption of eUSD against ETH (need to pay; 0.5%; redemption fee, denominated in ETH)

(2;) Less than 150%; liquidation mechanism of mortgage rate: any user can become a liquidator and use eUSD as payment currency to purchase liquidated stETH collateral at a discounted price (1- liquidation reward rate)

(3;) Based on the first two, when the eUSD price fluctuates, there will be arbitrage opportunities. When eUSD<$;1, arbitrageurs can purchase eUSD at a discount in the secondary market, and then rigidly redeem eUSD for ETH worth;$;1, as the number of arbitrageurs who repeatedly operate increases, the price will slow down. Slowly liquidated; when eUSD>$;1, arbitrageurs can deposit ETH/stETH as collateral to mint new eUSD, and then sell eUSD on the secondary market, waiting for more arbitrageurs to perform this operation , the price will be slowly lowered. After returning to the anchor, arbitrageurs will repurchase eUSD from the secondary market to repay the loan. The price difference before and after eUSD is the profit of the arbitrageur.

(4;) Curve provides eUSD exit liquidity. As of June 13, the circulation of eUSD was about 81.4 million US dollars, through Lybra's LBR emission incentives, 8.5 million eUSD has been operating in Curve's eUSD/USD LP Pool, with a TVL of about 21.4 million US dollars, daily transactions The volume is about 100,000 US dollars, and the liquidity utilization rate is 0.43%. However, the Curve eUSD/USD LP Pool ratio continues to be out of balance. What is rather strange is that the Curve v2 pool deployed by eUSD is used for volatile asset transactions instead of anchoring pegged assets, which may lead to mischief, triggering liquidation by guiding eUSD to decoupling upwards, and extracting liquidation assets from it.

In addition, the greatest significance of stablecoins lies in their adoption. It remains to be seen how effective eUSD is and whether it can be integrated and adopted by other on-chain protocols.

There are two points to note about rigid redemption:

One is that the rigid redemption needs to pay the "0.5%" fee of the redeemed ETH, which may lead to a "0.5%" tacitly allowed fluctuation space if there is an underwater offset of eUSD to "$;1" , because for arbitrageurs, only when the downward deviation is greater than; 0.5%; there is room for profit arbitrage.

The second is that rigid redemption does not mean repaying eUSD debts. Users who have minted eUSD can choose to provide rigid redemption services and get "0.5%" redemption payment fees, as well as higher LBR APY, fee compensation, etc. excitation. If a redemption occurs, the user who provides the redemption service will lose part of the collateral, reduce the corresponding debt at the same time, and get the "0.5%" redemption fee paid by other users, which means that after starting the service , the user's collateral will become the redemption liquidity of other users.

Risk Response

eUSD, or the entire LSDfi track, is essentially a second layer of nesting dolls. After depositing ETH/stETH into Lybra, it will be uniformly converted into stETH, relying on the original asset ETH and stETH, which is the largest ETH; 2.0; platform Lido reputation, has become a reliable asset in the DeFi field, so stETH can be regarded as a Matryoshka of ETH; eUSD is a stable currency minted on top of stETH collateral, which is the second layer of dolls. Users can obtain two incomes, deposit ETH into Lido to obtain the first pledge income and stETH certificate, and then cast the stETH mortgage into eUSD to obtain the second interest income. Through the double-layer nesting doll, users increase the income of holding ETH. High returns and high risks often complement each other, which is a major test for the platform, and the liquidation mechanism is an important guarantee for the platform to prevent risks and block the spread of risks.

Generally speaking, since 1 eUSD is mortgaged by at least; $;1.5 equivalent of ETH/stETH, this means that under normal circumstances, the overall mortgage rate of the Lybra Finance protocol must be above 150%.

For liquidation that does not touch the platform's risk control (that is, the overall mortgage rate of the agreement>; 150%;), when the borrower (casting eUSD) is liquidated, the user can become the liquidator, with the help of Keeper (a specific participant who plays the role of liquidation) ); Use your own eUSD balance to liquidate up to 50% of the borrower's collateral, and get 109% of the repaid eUSD value; collateral assets, and Keeper gets 1% of the repaid eUSD value; collateral assets. (Note: ;10%; is the liquidation reward, of which 9%; to the liquidator, ;1%; to the Keeper, but only applicable to liquidation using official liquidation tools)

For example: A deposited 1 stETH as collateral and minted 1400 eUSD a week ago, during this week, the dollar value of ETH dropped from;$;2200; to;$;2000;, at this time A's mortgage Rate = 2000/1400; =; 142%; <; 150%;. At this time, B acts as a Keeper to initiate liquidation for A, and the maximum liquidable collateral is 1 stETH*;0.5;=;0.5 stETH. Liquidator C has a balance of 500 eUSD, all of which are used to repay on behalf of A, C will receive 500/2000*;109%;=;0.2725 stETH, equivalent to 545 eUSD, and B as a Keeper will receive 500/2000*;1%; =;0.0025 stETH, equivalent to 5 eUSD. After C repays the debt for A, A's debt is 1400-500;=;900 eUSD, and the collateral value is 1-0.2725-0.0025;=;0.725 stETH, and the mortgage rate at this time is;0.725*;2000/900; =;161%;＞;150%;

It can also be seen that there is a time difference between the liquidation initiated by the Keeper and the liquidation performed by the liquidator. Therefore, it is not as long as the mortgage rate is lower than 150%; it will be liquidated immediately. There is a process similar to queuing, which is similar to DeFi The liquidation of the on-chain lending agreement is relatively similar.

At another extreme, the overall mortgage rate of the Lybra Finance agreement is lower than 150%; in this case, borrowers with a mortgage rate lower than 125% will face full liquidation of their collateral. In the case of complete liquidation, the liquidator pays eUSD equivalent to the debt of the borrower (liquidated person) to obtain a collateral value equivalent to the debt of the borrower * (mortgage rate - 1%;), which is deducted by 1 %; is owned by Keeper. The collateral and debts of the borrower, that is, the liquidated party, are cleared. If in a more extreme case, the mortgage rate is lower than 101%; that is, the mortgage rate < (100%; + Keeper reward ratio), the Keeper will not receive any rewards.