How Does fx Protocol Work?
fx Protocol is a DeFi platform that splits ETH collateral into a low-volatility token (fETH) and a leveraged token (xETH), while minting fxUSD, a decentralized stablecoin backed by liquid staking tokens. With $30M in TVL and novel volatility-splitting mechanics, its C+ grade reflects the experimental nature of its dual-token design and the complexity of managing multiple leveraged sub-pools.
TVL
$65M
Sector
Stablecoin
Risk Grade
C+
Value Grade
C-
Core Mechanisms
1.4.3
NovelDual-token volatility splitting: fETH (low-volatility) and xETH (leveraged long)
Novel mechanism that mathematically separates ETH collateral volatility into two derivative tokens; fETH absorbs minimal volatility while xETH captures amplified exposure
6.1.1
NovelfxUSD backed by LST sub-pools (wstETH, sfrxETH, WBTC)
Omni-stablecoin backed by multiple independent sub-pools of different collateral types with varying leverage ratios
4.1.4
NovelxPOSITION leveraged tokens with fixed leverage up to 10x
Leveraged long positions with flashloan-assisted entry and exit; novel in providing fixed leverage ratios via bonding curve
6.3.2
Stability pool with liquidation bonus for undercollateralized positions
Standard stability pool mechanism similar to Liquity for absorbing liquidations
6.4.1
Chainlink oracles for ETH/USD and LST exchange rates
Standard Chainlink price feeds for collateral valuation
2.1.2
FXN token with revenue sharing and gauge voting
Standard governance token with Curve-style gauge voting for emission direction
How the Pieces Interact
During extreme ETH price drops (>40% in 24h), the volatility splitting mechanism may not maintain the mathematical invariant, causing fETH to absorb more volatility than designed and xETH to face liquidation cascades
10x leveraged positions amplify liquidation cascades; flashloan-assisted entry enables rapid leverage buildup that can unwind violently during price declines
If one LST collateral type (e.g., sfrxETH) depegs or its exchange rate deviates, the affected sub-pool can impair fxUSD backing while other sub-pools remain healthy, creating complex partial undercollateralization
Stability pool may be insufficient to absorb cascading liquidations across multiple xPOSITION markets during a sharp market decline
Thin DEX liquidity for fxUSD could cause peg deviations during high redemption volume, as secondary market price diverges from NAV
What Could Go Wrong
- The dual-token volatility splitting mechanism (fETH/xETH) is a novel approach to stablecoin design that separates ETH collateral into low-volatility and leveraged components, creating untested edge cases at extreme market conditions.
- fxUSD as an omni-stablecoin backed by multiple sub-pools of liquid staking tokens introduces complex interactions between different collateral types and leverage ratios across xPOSITION markets.
- xPOSITION leveraged tokens (up to 10x) amplify ETH price movements and use flashloan-assisted leverage, creating cascading liquidation risk during sharp price declines.
- Protocol relies on Curve and Balancer pool liquidity for fxUSD peg maintenance; thin liquidity in these pools could cause significant deviations during market stress.
Volatility Splitting Breakdown During ETH Flash Crash
ModerateTrigger: ETH price drops >45% within 24 hours, overwhelming the mathematical invariant that separates fETH and xETH volatility exposure
- 1.Sharp ETH price decline triggers xPOSITION liquidations across 5x-10x leveraged positions — Liquidation volume overwhelms the stability pool, creating bad debt in xPOSITION markets
- 2.Volatility splitting invariant breaks as xETH cannot absorb all downside beyond its collateral — fETH begins absorbing ETH volatility beyond its designed tolerance, causing fETH to deviate from its low-volatility target
- 3.fxUSD sub-pools backed by affected LSTs become undercollateralized — fxUSD peg breaks as aggregate backing falls below 100%
- 4.Curve/Balancer pool liquidity for fxUSD is exhausted by sellers — fxUSD trades at significant discount on secondary markets, compounding panic
- 5.Remaining fxUSD holders face diluted backing across sub-pools — Recovery requires ETH price recovery or additional capital injection to restore full backing
Risk Profile at a Glance
Overall: C+ (39/100)
Lower score = safer