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  • Frax Ecosystem Overview
  • FXS & veFXS
    • Frax Shares (FXS)
    • veFXS
    • Gauges
    • FXS Distribution
    • FXS Smart Contract & Addresses
  • GOVERNANCE
    • Frax Governance Overview
    • How It Works
    • Advanced Concepts
    • Fraxtal Snapshot Voting
  • FRAX V1 - ORIGINAL
    • Original Design
    • Staking Contracts
    • FRAX ABI & Token Addresses
    • Frax V1 Pool ABI & Addresses
    • Core Frax Multisigs
  • FRAX V2 - Algorithmic Market Operations (AMO)
    • AMO Overview
    • AMO Minter
    • Collateral Investor
    • Curve
    • Uniswap v3
    • FRAX Lending
    • Decentralization Ratio (DR)
  • FRAX V3 - 100% CR AND MORE
    • Overview
    • Fraxtal
    • AMOs
    • RWAs
    • sFRAX
    • FXBs
    • sFRAX Token Addresses
    • sFRAX & FXB Multisigs
  • Bridging
    • Fraxferry
    • LayerZero x Stargate
    • Fraxtal Bridge
  • Frax Price Index
    • Overview (CPI Peg & Mechanics)
    • Frax Price Index Share (FPIS)
    • FPIS Distribution
    • CPI Tracker Oracle
    • FPI Controller Pool
    • veFPIS
    • FPIS Conversion / FPIS Locker
    • FPI and FPIS Token Addresses
    • FPI Multisigs
  • Fraxswap
    • Overview
    • Technical Specifications
    • Fraxswap Contract Addresses
  • Fraxlend
    • Fraxlend Overview
    • Key Concepts
    • Lending
    • Borrowing
    • Advanced Concepts
      • Position Health & Liquidations
      • Interest Rates
      • Vault Account
    • ABI & Code
    • Fraxlend Multisigs
  • Frax Ether
    • Overview
    • frxETH and sfrxETH
    • Technical Specifications
    • Redemption
    • frxETH V2
    • frxETH V2 Technical Details
    • frxETH Code & V2 Addresses
    • frxETH and sfrxETH Token Addresses
    • frxETH Multisigs
  • BAMM
    • Overview
  • Frax Oracle
    • Frax Oracle Overview
    • How It Works
    • Advanced Concepts
    • Fraxtal Merkle Proof Oracles
  • Guides & FAQ
    • FAQ
    • Staking
    • Uniswap Migration / Uniswap V3
    • Fraxswap / FPI
  • Miscellany
    • All Contract Addresses
    • Bug Bounty
    • Miscellaneous & Bot Addresses
    • API
  • Other
    • Audits
    • Media Kit / Logos
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  1. Frax Ether

frxETH and sfrxETH

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Last updated 7 months ago

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ETH in the Frax ecosystem comes in two forms, frxETH (Frax Ether), and sfrxETH (Staked Frax Ether).

frxETH

frxETH acts as a stablecoin loosely pegged to ETH, so that 1 frxETH always represents 1 ETH and the amount of frxETH in circulation matches the amount of ETH in the Frax ETH system. When ETH is sent to the frxETHMinter, an equivalent amount of frxETH is minted. Holding frxETH on its own is not eligible for staking yield and should be thought of as analogous as holding ETH. frxETH peg is defined as 1% on each side of 1.00 exchange rate meaning the frxETH peg is defended to keep the exchange rate between 1.01-.9900 ETH per 1 frxETH.

sfrxETH

sfrxETH is a ERC-4626 vault designed to accrue the staking yield of the Frax ETH validators. At any time, frxETH can be exchanged for sfrxETH by depositing it into the sfrxETH vault, which allows users to earn staking yield on their frxETH. Over time, as validators accrue staking yield, an equivalent amount of frxETH is minted and added to the vault, allowing users to redeem their sfrxETH for a greater amount of frxETH than they deposited.

The exhange rate of frxETH per sfrxETH increases over time as staking rewards are added to the vault. By holding sfrxETH you hold a % claim on an increasing amount of the vault's frxETH, splitting staking rewards up among sfrxETH holders proportional to their share of the total sfrxETH. This is similar to other autocompounding tokens like Aave's aUSDC and Compound's cUSDC.

frxETH
sfrxETH