sfrxUSD: Secure, Transparent, Yield-Bearing Stablecoin
sfrxUSD is Frax's yield-bearing stablecoin, with an onchain balance sheet and a Treasury-rate yield floor. How it works and why the floor matters.
sfrxUSD is Frax's yield-bearing stablecoin, built to deliver the highest risk-adjusted returns while maintaining a strict focus on security and transparency. Its distinguishing feature is a floor: when DeFi strategies do not meaningfully beat the U.S. Treasury rate, capital sits idle in the vault and earns that baseline rate instead.
With a rise in recent DeFi exploits, capital is becoming more selective. Users and partners are no longer just chasing high yields. They are prioritizing projects that have proven they can protect capital over time.
A track record that's earned
Frax has operated for over five years, securing billions in onchain assets without a security incident. That history sets the foundation for sfrxUSD. This track record is the result of deliberate choices:
- Favoring architectural simplicity over unnecessary complexity
- Integrating with battle-tested assets and protocols
- Maintaining active oversight of deployed capital with governed strategies
- Best-in-class security procedures, onchain and offchain
In an industry where risk often compounds quietly, these decisions have allowed Frax to remain resilient across market cycles. We wrote about that approach in more detail in Security is our product.
How sfrxUSD works
sfrxUSD is a yield-bearing version of frxUSD, the fully collateralized digital dollar. Users deposit frxUSD and receive sfrxUSD, which increases in value over time as yield is generated. Users get passive, onchain dollar yield without needing to actively manage positions or move funds between protocols.
Capital in sfrxUSD is managed by the Frax core team and deployed into a set of carefully selected strategies across DeFi. These strategies are continuously monitored and adjusted based on market conditions, and will always outperform the floor of U.S. Treasury yield.
If DeFi strategies do not yield higher than the U.S. Treasury yield in a substantive manner, the frxUSD remains safely in the sfrxUSD vault idly and earns the baseline risk-free rate. This essentially means sfrxUSD is an all-purpose vault that always has a risk-free rate APY floor, a powerful guarantee that few DeFi primitives can provide.
Today, this includes lending markets like Fraxlend and Aave, liquidity provisioning through Curve and Convex, and exposure to both DeFi-native and RWA-backed yield sources such as tokenized Treasuries and savings primitives.
Rather than optimizing for the highest possible yield at any given moment, sfrxUSD focuses on consistency and downside protection. Allocations are diversified and evolve through governance, ensuring the system adapts without introducing unnecessary risk.
Transparency by default
A defining feature of sfrxUSD is that its balance sheet is fully visible onchain at all times. The live sfrxUSD balance sheet provides:
- Real-time visibility into all positions
- Continuous proof of reserves
- The ability for anyone to independently verify the system
There is no reliance on delayed reporting or offchain attestations. Transparency is built into the product itself. Reserves backing frxUSD are published the same way, on the Frax transparency dashboard.
Built for integration
sfrxUSD is designed to function as a foundational yield layer for other products and ecosystems. For partners, it offers:
- A dollar-denominated asset with built-in yield, great for looping applications
- A strong security profile backed by a multi-year track record
- A simple integration path for end users
- Native availability across dozens of chains through Frax's hardened custom LayerZero mesh
This makes it well suited for wallets, DeFi protocols, and broader financial applications looking to offer trusted yield products without added complexity. Because sfrxUSD is already deployed across a wide set of networks, partners can integrate an asset that is not only secure and productive, but also ready for multichain users and liquidity from day one.
A shift toward quality
Market conditions have reinforced a clear trend. Capital is moving toward protocols that prioritize security over short-term high yields. sfrxUSD reflects that shift, combining our 5-year security track record with actively managed, risk-aware strategies that are fully transparent onchain.
The result is a yield-bearing stablecoin designed not just to perform, but to endure. Set-it-and-forget-it savings.