Where does sUSDS yield come from? Is it just printed from thin air?
This is the most fundamental question. sUSDS yield doesn't come from minting new tokens — it comes from Sky Protocol's real revenue.
Three revenue streams:
1. Stability Fees: Users who borrow USDS against collateral (e.g., ETH) pay an annual stability fee — typically 5–8%. This is the protocol's largest revenue source.
2. PSM Fees (Peg Stability Module): When users swap stablecoins like USDC directly for USDS, the protocol collects a small conversion fee.
3. RWA Income: Sky invests a portion of its treasury in real-world assets (U.S. Treasuries, short-term bonds), and the interest flows back into protocol revenue.
All three streams flow into Sky's Surplus Buffer. After deducting operating costs, the remainder is distributed to sUSDS holders at the Sky Savings Rate.
In plain terms: holding sUSDS means indirectly sharing the interest paid by everyone who borrows from Sky, plus the Treasury yields from the protocol's RWA investments. The yield is backed by real underlying assets — not thin air.
What's the difference between sUSDS and sDAI? Which should I use?
Many users migrating from DSR (DAI Savings Rate, the MakerDAO-era version) ask this. Technical level: sDAI is a product of the old architecture (MakerDAO → DAI ecosystem); sUSDS is the new version after Sky Protocol's brand upgrade. The underlying logic is identical — both are 'deposit yield-bearing stablecoin, hold yield-bearing receipt token.' Practical differences: Yield rate — Sky Savings Rate (sUSDS) is typically the same as or close to DAI Savings Rate (sDAI), as both share the same governance adjustment mechanism. But at certain times, Sky governance may set SSR higher than DSR to attract migration. Liquidity — sUSDS DeFi integration is catching up: after 2025, major DEXs (Curve) and lending protocols (Morpho) support sUSDS, but sDAI has a longer history and some smaller platforms may still only recognize sDAI. Migration incentives — Sky offered seamless USDC → USDS conversion channels and higher SSR during the brand transition to naturally migrate holders to sUSDS. Recommendation: Put new funds directly into sUSDS; for existing sDAI positions, no urgent switch needed given near-identical yields — check platform support first.
What are the main risks of sUSDS? What you must know before holding it
Yield-bearing doesn't mean risk-free. sUSDS risks fall into three layers.
Layer 1: Protocol Risk (most severe) If Sky Protocol's smart contracts are exploited, deposited USDS could be entirely lost. Sky is one of DeFi's oldest protocols with multiple audits, but no protocol in history has been 'impossible to hack.' Risk assessment: low but non-zero.
Layer 2: Rate Risk (most common) Sky Savings Rate is governance-determined and can be lowered at any time. If overall DeFi interest rates decline (e.g., Fed rate cuts, reduced on-chain borrowing demand), SSR could drop from 8% to 3% or lower. Your USDS principal is unaffected, but expected interest income shrinks.
Layer 3: USDS Depeg Risk (indirect) If USDS itself depegs (even temporarily), sUSDS's USD-denominated value falls. USDS's peg relies on overcollateralization and PSM — historically MakerDAO's DAI experienced brief minor depegs during extreme market conditions, but always recovered quickly.
Conclusion: sUSDS is a relatively low-risk yield option in DeFi — but not risk-free. Think of it as 'DeFi fixed deposit': carries more protocol-layer risk than holding plain USDC, but far safer than participating in complex DeFi strategies.
Analogy: sUSDS is like a savings passbook that automatically appreciates
Imagine depositing money at a bank that doesn't pay interest — instead it gives you a passbook representing your share of deposits. The number of passbook units stays the same (say, 100 units), but as the bank earns interest, each unit can be redeemed for more and more cash:
Real workflow: (1) Start with 1,000 USDC. (2) Swap USDC to USDS at sky.money (1:1, PSM zero slippage). (3) Deposit USDS into SSR contract, receive sUSDS (e.g., 1,000 USDS → 980 sUSDS, since the exchange rate already reflects accumulated past yield). (4) One year later, 980 sUSDS redeems for approximately 1,080 USDS. (5) Swap USDS back to USDC — no manual reward claiming at any step.
Best use case: Idle stablecoins with no immediate deployment plan and low risk tolerance — sUSDS lets your stablecoins auto-compound, like parking cash in a high-yield savings account.
sUSDS's core tradeoff is 'liquidity vs. yield efficiency.' sUSDS itself is liquid (redeem anytime), but using sUSDS as DeFi collateral introduces liquidation risk. By contrast, simply holding sUSDS in the SSR contract is the most frictionless approach — no borrowing, no liquidity provision, no impermanent loss — but yield is limited to just the SSR layer. Another tradeoff is 'protocol concentration risk': putting all funds in sUSDS means all eggs in the Sky Protocol basket. If your stablecoin savings are substantial, consider diversifying across yield products from different issuers: USDC, sUSDS, sfrxUSD, etc.