Sperax DAO

Title: SIP-21: Increase USDC redemption fee

Author(s): Sperax Core Team

Reference: N / A

Created: [11/16/22]

Labels: [ex: #Governance, #LiquidityMining, #YieldStrategy, etc.]

Simple Summary

This summary proposes a fee adjustment for redeeming USDC from the USDs collateral pool. Increasing USDC’s redemption fee will incentivize users to withdraw other stablecoins, leaving USDC inside the pool. This produces a barrier for anyone using USDs as a cheap way to USDC from other whitelisted collateral.

Abstract

Over the last 30 days, USDC and DAI has been nearly 100% redeemed by community members. This likely resulted from the combination of volatile times and low redeem fees for USDs. With a redeem fee of 0.2%, it was often more profitable to use the SperaxUSD protocol to swap than it was to swap using Uniswap.

Motivation

A higher redemption fee will deter this activity, working toward reducing reliance on VST and FRAX. In the future this will be replaced with dynamic fees to obtain diversified USDs collateral.

Overview

Users have been using Sperax USD as a means to swap various collateral types. For example, when VST introduced GLP vaults users were minting USDs with VST and redeeming USDC. You can see in the screenshot from app.sperax.io/analytics, the USDC has been completely drained, leaving only FRAX and VST.

Despite a good depth in terms of liquidity for our Uniswap v3 USDs/USDC pool, we have been seeing the majority of the users redeeming their USDs tokens for USDC. Below is an example of a situation where the user may redeem instead of swap.

In the above situation, it was more profitable for this user to redeem for USDC instead of swap USDs for USDC on Uniswap. By increasing the redemption fee, more users will be encouraged to swap on the Uniswap pool instead of redeeming from the protocol itself.

This will be further replaced with Dynamic fees in the future: The mint/redeem fee will fluctuate based on how much yield is offered for the collateral type, and the target weight for that collateral type in the pool. For example, if the collateral pool has too much VST, and the VST collateral yield strategy is low, the redeeming fee for VST would lessen and VST minting would become more expensive. In contrast, if the collateral pool has too little USDC, redeeming for USDC becomes more expensive, and minting with USDC becomes cheaper.

Technical Specification

Increase USDC redeem fee from 0.2% to 0.5%