sUSDS is the savings-rate variant of USDS, the rebranded successor to MakerDAO's DAI stablecoin. Holders deposit USDS into the Sky Savings Module (the renamed DAI Savings Rate, or DSR) and receive sUSDS, an ERC-20 whose redemption value rises with the Sky Savings Rate. The yield is paid by Sky's portfolio of onchain lending positions, real-world-asset (RWA) loans, and direct ETH-backed collateral. As of April 25, 2026, the Sky Savings Rate sits in the 3.75-4.5% APY range, with several billion dollars deposited (Sky Protocol dashboard).
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This article explains how the savings rate is set, where the yield comes from, how sUSDS compares to T-bill-backed and synthetic-dollar yield tokens, and what changed in the Maker-to-Sky rebrand. The token remains the simplest non-T-bill yield stablecoin to hold and is the closest onchain analog to a high-yield savings account.
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sUSDS is a wrapper token that represents a deposit in Sky's savings module. A holder transfers USDS into the contract; the contract mints sUSDS at the current redemption ratio. Over time, the redemption ratio rises as savings-rate revenue accrues. The holder's sUSDS balance does not change; the price of sUSDS in USDS rises. As of April 23, 2026, 1 sUSDS redeems for ~1.094 USDS.
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USDS itself is the renamed DAI. The Sky upgrade (formerly MakerDAO's "Endgame" plan) renamed DAI to USDS at a 1:1 swap, with DAI continuing to circulate alongside USDS during a transition window. USDS supply was approximately $11 billion in March 2026 (DeFiLlama Sky page), with combined DAI + USDS supply around $13 billion. The combined USDS + DAI float makes Sky the third-largest dollar stablecoin issuer behind Tether and Circle.
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The savings module is the same mechanism that powered the DAI Savings Rate. The protocol mints USDS into the savings contract from its surplus buffer, funded by the interest Sky charges on its CDP-style vaults and on direct USDC reserves. The Sky Savings Rate (SSR) is set by governance. Recent SSR values: 9% (Q3 2024 peak), 6.5% (Q4 2024), 4.75% (Q2 2026).
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The Sky Savings Rate is funded by a portfolio. Understanding the portfolio explains the rate's stability and its ceiling.
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Every USDS in circulation is backed by collateral held in Sky vaults. The composition shifts with governance, but as of March 2026 the breakdown is:

Interest from the four buckets flows into Sky's surplus buffer. The buffer accumulates protocol revenue, pays MKR and SKY token-holder distributions, and funds the Sky Savings Rate. Governance sets SSR at a level that distributes most current revenue to depositors while maintaining a buffer for stress events.
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A holder deposits USDS into the savings contract. The contract increments an internal accumulator (called chi) at the SSR rate. sUSDS holdings remain numerically constant; the redemption value (USDS-per-sUSDS) is the current accumulator. There is no rebase, no balance change, no lockup. Withdrawal is instant.
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SSR is a governance variable. Sky token holders vote on adjustments through executive votes. The rate generally tracks the federal funds rate plus a spread reflecting RWA and crypto-lending demand, but governance can deviate. The September 2024 cut from 9% to 6.5% was a deliberate signal that Sky wanted to grow USDS supply rather than maximize per-holder yield.
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The 12-month range for SSR has been 4.75% to 9.0%. The current 4.75% reflects a Fed funds rate of ~4.5% plus a thin spread for protocol margin and RWA loan premium. The yield is paid in USDS terms, settling continuously into sUSDS. There are no fees. There is no minimum deposit.
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Pendle markets exist for sUSDS Principal Tokens. PT-sUSDS Mar-2026 implied an APY of 5.1% in early April, slightly above spot, reflecting the small risk premium PT holders earn for committing capital to maturity.
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SSR historically lags Fed-funds moves by 30 to 60 days. After the September 2024 Fed cut, SSR dropped from 6.5% to 6.0% in October and to 5.0% by December. After the January 2026 cut, SSR moved from 5.0% to 4.75%. Holders should expect continued tracking of the Fed's path, mediated by Sky governance discretion.
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The yield is conservatively paid relative to its underlying capacity, which compresses risk relative to synthetic-dollar tokens. Five risks remain.
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Sky's collateral is heterogeneous. A bad debt event in one vault (a sharp ETH crash that exceeds liquidation infrastructure, an RWA loan default, an oracle failure) can erode the surplus buffer. Maker has historically socialized losses through MKR/SKY dilution, but in extreme cases USDS could be undercollateralized. The 2020 Black Thursday event cost Maker approximately $6.65 million in unbacked DAI, against the supply of the time. The system has been hardened since.
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The 22% allocation to tokenized real-world credit means Sky is exposed to off-chain default risk. The HSBC, BlockTower, and Centrifuge wrappers are senior and short-dated, but a defaulting borrower (or a frozen custodian) takes time to resolve. Sky's RWA exposures are public and updated quarterly through governance forums.
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SSR is set by token-holder vote. A rapid migration of token holders, a contentious vote, or a delegate captures could change SSR mid-quarter. Sky's governance has been more conservative than aggressive, but there is no contractual floor on the rate.
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The savings module contracts are forks of the original DSR (live since 2019, no incidents). The USDS migration introduced new code surface, audited by Spearbit and ChainSecurity. The risk is non-zero but lower than for newer protocols.
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USDS targets $1.00. The token has historically held its peg within ~50 bps. A USDS depeg cascades into sUSDS: redemption value still rises, but the redeemed USDS may trade at a discount to a dollar. The Peg Stability Module's USDC reserve provides a hard floor at the 1:1 USDC-USDS swap rate, capped only by USDC's own peg.
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sUSDS is the most permissionless of the regulated-yield options. There is no KYC, no jurisdiction restriction, no lockup. The trade-off is the broader reserve composition and the dependence on Sky governance.
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Acquire USDS (DEX swap from USDC, or mint from a Sky vault), then deposit into the savings module via the Sky app. Yield accrues from block one. Withdrawal is instant.
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Spark is Sky's lending sub-DAO. Depositors can supply USDS and earn slightly elevated yield (lending demand on top of the savings rate floor). Spark also accepts sUSDS as collateral for borrowing other assets.
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PT-sUSDS markets allow locking in a fixed APY by buying Principal Tokens at a discount and holding to expiry. Useful for treasury teams that want rate certainty for a specific window.
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Aave V3 and Morpho Blue list sUSDS as collateral. Looped strategies (deposit sUSDS, borrow USDC, swap to USDS, redeposit) increase effective yield at the cost of liquidation risk and additional smart-contract surface.
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In August 2024, MakerDAO began its transition to Sky. The relevant changes for yield-bearing-stablecoin holders:

For most savers, the practical change was a name on the dashboard. Existing DAI deposits in the DSR were not auto-migrated; holders chose when to upgrade.
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The most common alternative to sUSDS is depositing USDC into Aave, Morpho, or a curated vault. The comparison reveals what each engine does and does not provide.
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sUSDS sits between baseline Aave and curated Morpho. It is the simplest non-custodial onchain yield. It does not require selecting a vault curator or accepting smart-contract risk on multiple lending markets.
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sUSDS holders take Sky's protocol risk: the heterogeneous reserve, the governance variable rate, the RWA exposures. Aave depositors take Aave's protocol risk plus USDC's issuer risk. Morpho curated-vault depositors take Morpho's protocol risk, the curator's strategy risk, and the accepted markets' isolated risks. The risk surfaces are different in shape; none is unambiguously safer.
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sUSDS holdings are accepted as collateral on Spark, Aave, and Morpho. The token can be used in DeFi without unwinding to USDS. Aave-deposited USDC must be withdrawn before composing into other strategies. Morpho-vault-deposited USDC similarly requires withdrawal.
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sUSDS appreciates through redemption value. Tax treatment in most jurisdictions treats this as accrued interest. Aave aTokens rebase. Morpho curated vaults issue ERC-4626 shares that appreciate. The accounting profile of each varies in practice.
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Spark Protocol is Sky's lending sub-DAO. The relationship matters for sUSDS holders.
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Spark accepts USDS, sUSDS, and other Sky-accepted assets as collateral. Spark's lending rates are derived from Sky's USDS issuance rate plus a markup. The Spark token (SPK) is distributed to depositors as an incentive on top of the underlying interest. A Spark sUSDS depositor effectively gets the SSR plus the Spark deposit rate plus the SPK token incentive, all on the same dollar.
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The arrangement creates a yield-stacking opportunity that sUSDS holders should understand. A common strategy: hold sUSDS for the SSR, deposit it into Spark for additional yield, accept SPK token incentives, and either hold or sell the SPK. The net APY can reach 7-9% during incentive windows. The trade-offs: additional smart-contract surface (Spark plus the deposit contract), governance dependence on Spark's distribution schedule, and exposure to SPK token price.
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sUSDS is Ethereum-only as of April 2026. A treasury team holding sUSDS to harvest the savings rate often needs to settle payments in USDC on Base, Arbitrum, Solana, or Polygon. Manual unwinding adds steps and slippage.
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Eco Routes handles the cross-chain settlement layer. A team submits an intent — pay 25,000 USDC on Polygon — and Routes selects the path: unwrap sUSDS to USDS, swap to USDC, bridge through CCTP, settle. Solvers compete on the route. The team holds yield-bearing positions on Ethereum and pays from any chain a counterparty needs. See the MakerDAO and DAI primer for context on the Sky stack, and stablecoin treasury APIs compared for routing options.
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Functionally yes, technically separate. sDAI wraps DAI and earns the DSR. sUSDS wraps USDS and earns the Sky Savings Rate. Both rates are set by Sky governance and historically move together. Read the MakerDAO and DAI primer for the full transition.
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The savings rate cannot go below zero, but a Sky bad-debt event could erode the surplus buffer and dilute SKY holders. In an extreme scenario, USDS could trade below $1.00. The Peg Stability Module provides a USDC-backed floor at the 1:1 swap rate.
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Different engine. sUSDS yield comes from lending and RWA loans (4-7% range). sUSDe yield comes from perp-funding rates (4-25% range). The premium sUSDe pays compensates for funding-rate volatility and exchange counterparty risk.
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Yes. There is no KYC at the protocol level. Holders should consult counsel on the SEC's evolving posture toward yield-distributing tokens, but the protocol does not exclude any jurisdiction.
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Sky governance votes on SSR through executive proposals. The rate generally tracks Fed funds plus a spread reflecting RWA and crypto-lending demand. Governance can deviate. Recent moves: 9% in Q3 2024, 6.5% in Q4 2024, 4.75% in Q2 2026.
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Yes. Aave V3, Morpho Blue, and Spark Protocol list sUSDS as collateral. LTVs range from 70% to 80%. The collateral retains its accruing yield while pledged. See stablecoin automation platforms for related strategies.
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