How Does Frax Ether Work?
Frax Ether is the liquid staking product from Frax Finance, offering a unique dual-token approach to ETH staking. frxETH is pegged 1:1 to ETH and can be used in DeFi, while sfrxETH is a yield-bearing vault that accumulates all staking rewards. Users can either earn staking yield (by holding sfrxETH) or LP fees (by providing frxETH to Curve pools). The product holds roughly $126 million in staked ETH.
TVL
$116M
Sector
Liquid Staking
Risk Grade
C+
Value Grade
D+
Core Mechanisms
Liquid-Staking/Dual-Token
NovelfrxETH (peg token) + sfrxETH (yield-bearing vault token) dual-token model
Unlike rebasing models (stETH), Frax uses a dual-token system where frxETH is pegged to ETH and sfrxETH accumulates yield. Users who stake frxETH into sfrxETH earn all staking rewards, while frxETH holders in LPs earn trading fees instead.
Staking/ETH-Validator
Frax-operated Ethereum validators for ETH staking
Standard Ethereum PoS validator operation. Frax runs validators using deposited ETH and distributes staking rewards to sfrxETH holders.
Staking/Redemption-Queue
RedemptionQueueV2 for frxETH-to-ETH unstaking
Standard redemption queue pattern for liquid staking. Had a critical DoS vulnerability in December 2025 that was stealth-patched.
DEX/AMM/Liquidity-Pool
Curve frxETH/ETH pool for secondary market liquidity
Standard Curve stable pool for maintaining frxETH/ETH peg. frxETH holders who provide liquidity earn Curve fees instead of staking yield.
Oracle/Price-Feed
frxETH/ETH price feeds for DeFi integrations
Standard oracle integration for frxETH and sfrxETH pricing across lending protocols and other DeFi integrations.
Governance/Multi-Sig
Frax team multi-sig with governance oversight
Protocol parameters controlled by Frax team multi-sig. Governance through FXS token voting exists but team retains significant control.
Cross-Product/Ecosystem
Integration with broader Frax ecosystem (Fraxtal, FraxLend, frxUSD)
frxETH serves as collateral and yield source across multiple Frax products. Deep ecosystem integration.
How the Pieces Interact
The stealth-patched DoS vulnerability in December 2025 demonstrates opaque security practices. Future vulnerabilities may be handled similarly, leaving users unaware of risks in deployed contracts.
frxETH peg relies on Curve pool depth. If liquidity providers withdraw during a market stress event, frxETH can depeg from ETH. sfrxETH holders cannot quickly exit without accepting depeg discount.
frxETH used as collateral in FraxLend and other Frax products creates circular risk. A frxETH depeg could trigger liquidation cascades across the Frax ecosystem simultaneously.
Frax operates its own validators with a 2% insurance fund for slashing events. A mass slashing event exceeding the insurance buffer would impair sfrxETH exchange rate, with no external backstop.
The dual-token model creates a game-theoretic tension: if too many frxETH holders stake into sfrxETH, Curve pool liquidity thins and the peg weakens. If too many LP, sfrxETH yields become very attractive, draining LP.
What Could Go Wrong
- Critical DoS vulnerability in frxETH redemption queue (December 2025) was stealth-patched without public disclosure. The team denied the bug existed while quietly fixing it, raising serious trust concerns about security practices.
- Dual-token model (frxETH + sfrxETH) adds complexity: frxETH pegged to ETH must maintain liquidity while sfrxETH accumulates staking rewards. If frxETH liquidity pools thin, the peg mechanism weakens.
- Part of the sprawling Frax ecosystem (FRAX, frxUSD, Fraxtal L2, FraxLend, FraxSwap) where cross-product dependencies compound risk. A failure in one product can cascade to frxETH.
frxETH Depeg and Curve Pool Death Spiral
ModerateTrigger: A broad crypto market crash or Frax ecosystem-specific event triggers mass frxETH selling on Curve, depleting pool liquidity and breaking the ETH peg by >3%
- 1.Large frxETH holders sell into Curve pool during market stress — Curve pool becomes imbalanced; frxETH trades at 2-5% discount to ETH
- 2.Arbitrageurs cannot close the gap because redemption queue has multi-day delays — Depeg persists and widens as market participants lose confidence in peg mechanism
- 3.FraxLend liquidations trigger as frxETH collateral values drop — Cascading liquidations across Frax ecosystem products that accept frxETH as collateral
- 4.sfrxETH holders rush to unstake and sell frxETH, amplifying selling pressure — Reflexive depeg deepens; frxETH reaches 10%+ discount to ETH
Risk Profile at a Glance
Overall: C+ (38/100)
Lower score = safer