sUSDe, sUSDS, and sDAI are the three largest yield-bearing stablecoin wrappers in DeFi, with combined supply north of $13B as of May 2026 per DeFiLlama. All three follow the same form factor: deposit a stable token, receive a yield-bearing receipt that appreciates against the base. But the yield source, rate behavior, custodianship, and risk surface differ in ways that matter to anyone sizing a position.
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sUSDe earns from perpetual funding rates and ETH staking via Ethena's delta-neutral hedge. sUSDS earns the Sky Savings Rate, set by Sky governance and funded by Sky's CDP system plus a tokenized T-bill allocation. sDAI earns the DAI Savings Rate, the legacy track Sky maintains for users who have not migrated DAI to USDS. The three are not interchangeable; choosing among them is a choice about which risk regime you want to underwrite.
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This article walks through each wrapper's mechanism, current rate, supply, audit posture, and primary risk vector. It covers the DAI to USDS to sUSDS migration path Sky has been pushing since the 2024 rebrand, the sUSDe cooldown and secondary-market discount, and the practical question of when one wrapper makes more sense than another. The aim is enough mechanism to choose intelligently, not a recommendation.
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sUSDe is the staked, yield-bearing form of Ethena's USDe synthetic dollar. USDe itself is collateralized by a delta-neutral position: long staked ETH (and liquid restaking tokens), short an equivalent notional of ETH perpetual futures. The hedge cancels price exposure, and the funding-rate payments plus staking yield accrue to sUSDe holders. Details in Ethena USDe and sUSDe explained.
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sUSDS is the staked form of USDS, the rebranded successor to DAI that Sky launched in September 2024. USDS is a CDP-backed stablecoin, collateralized primarily by ETH, staked ETH, and a tokenized US Treasury allocation managed through Sky's RWA partners. sUSDS pays the Sky Savings Rate (SSR), set by Sky governance and currently 3.75% per sky.money.
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sDAI is the staked form of DAI, the original Maker stablecoin that Sky still maintains alongside USDS. sDAI pays the DAI Savings Rate (DSR), which historically tracks below the SSR because Sky is steering users toward USDS. Both DAI and USDS remain fully redeemable through the Maker / Sky modules, and DAI to USDS conversion is one-for-one via the Sky upgrade contract.
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The mechanics behind each yield are fundamentally different, even though the form factor is identical. Understanding the source matters because each source breaks under different conditions.
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sUSDe yield comes from market structure. Crypto perpetual futures have a funding rate that clears imbalances between longs and shorts. Long-biased speculators dominate the order book most of the time, so funding is structurally positive and shorts get paid. Ethena's hedge sits on the short side. The yield is variable, market-driven, and uncorrelated with traditional fixed income. It compresses when sentiment cools and can flip negative for short windows.
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sUSDS yield comes from governance plus T-bills. The Sky Savings Rate is set by Sky governance based on the protocol's net interest margin: stability-fee revenue from CDP borrowers plus T-bill yield from the RWA allocation, minus operating costs and surplus retention. Governance can raise or cut the rate. Sky publishes the rate change history and the surplus buffer that backs the SSR.
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sDAI yield comes from the legacy DSR. The DAI Savings Rate is a separate parameter Sky governance maintains for DAI holders. It is typically set below the SSR to encourage migration to USDS. Mechanically the DSR is funded the same way as the SSR (CDP fees plus RWA), but the rate is administered separately.
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The table below summarizes the three across the dimensions that drive a sizing decision. All numbers as of May 24, 2026; cross-check against DeFiLlama Yields and each issuer's site before deploying capital.
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The pattern: sUSDe pays the highest expected APY but with variance and tail risk that the others lack. sUSDS pays a mid-single-digit administered rate backed by Sky's CDP economics and RWA allocation. sDAI pays a lower administered rate on the legacy track Sky maintains for compatibility. The right pick depends less on the headline APY than on which risk you would rather underwrite.
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All three wrappers have multiple audit reports published, but the surface being audited differs.
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Ethena sUSDe audits. Quantstamp, Pashov, Cantina, and Spearbit have audited Ethena's minting, staking, and accounting contracts. The audit list is at ethena-labs.gitbook.io. Audits cover the smart contract layer; they do not audit the hedge execution, the perp venue counterparties, or the Off-Exchange Settlement custody flow, which sit offchain and are addressed via attestation rather than audit.
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Sky sUSDS and sDAI audits. Sky inherited Maker's audit lineage going back to 2017, with reports from ChainSecurity, Trail of Bits, and PeckShield, plus a long-running formal verification program documented at github.com/makerdao/audits. The CDP system has the longest production track record of any DeFi protocol. RWA custody sits offchain and is governed by Sky's RWA partners, which publish attestations rather than full audits.
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The practical difference: Sky's onchain code has been live and battle-tested for nearly nine years; Ethena's has been live for roughly two years. Both have credible audits. Ethena carries additional offchain operational risk (perp venues, custody providers) that Sky does not, while Sky carries offchain RWA custody risk that Ethena does not.
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Sky has been steering users from DAI to USDS since the September 2024 rebrand. The migration is one-for-one, gas-only, and reversible. The path:
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Step 1: DAI to USDS. Use the Sky upgrade contract at sky.money or via the contract directly. Deposit DAI, receive USDS at 1:1. There is no fee beyond gas. Reverse swap (USDS to DAI) is supported through the same contract and rate.
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Step 2: USDS to sUSDS. Approve the sUSDS contract and stake USDS via the Sky app. You receive sUSDS at the current exchange rate, which starts at 1:1 at protocol launch and rises over time as the Sky Savings Rate compounds. Unstaking is instant (no cooldown), unlike sUSDe's seven-day window.
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Holders who want to skip the wrapper and earn the SSR through other venues can deposit USDS into Spark Protocol's sDAI-equivalent vault, which mirrors the SSR through a separate composable interface. Most users go direct to sUSDS for the canonical wrapper. Migration data: Sky publishes the share of legacy DAI that has migrated to USDS at sky.money.
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The framing that helps most users:
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sUSDe makes sense when you have DeFi protocol comfort, can tolerate APY variance, and want exposure to a yield source uncorrelated with traditional rates. Sizing should account for funding-flip windows and the seven-day cooldown. Most yield aggregators that target stablecoin returns allocate some share to sUSDe for the funding spread, and Aave V3 lists sUSDe as collateral with bespoke risk parameters.
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sUSDS makes sense when you want an administered, lower-variance rate backed by Sky's nine-year CDP track record and the RWA allocation. The 3.75% rate is below the front-end T-bill yield, but the wrapper is fully onchain, instantly redeemable, and composable across Spark, Aave, Morpho, and Curve. It is the safest of the three by track record.
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sDAI makes sense when you are holding DAI for legacy reasons (existing CDP positions, integrations that have not added USDS support, or platforms that only accept DAI) and want to earn the DSR without converting. For new positions, sUSDS pays more and is the canonical track Sky is steering toward. Most users should migrate to sUSDS unless there is a specific reason to stay on DAI.
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All three are deeply integrated into DeFi, but the integration depth differs.
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sUSDS has the deepest DeFi integration because it inherits the DAI integration footprint. Aave, Compound, Morpho, Spark, Curve, Pendle, and most yield aggregators support sUSDS as collateral, base asset, or yield-bearing input. Spark Protocol, which is the Sky-aligned lending market, has sUSDS as a first-class asset and offers the lowest USDC borrow rates against sUSDS collateral on most days.
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sUSDe has fast-growing integration depth but a younger footprint. Aave V3 lists sUSDe with capped exposure, Morpho Blue runs sUSDe markets, and Pendle has been the dominant venue for sUSDe yield trading (PT-sUSDe and YT-sUSDe markets). Curve hosts large USDe / USDC pools that let users skip the sUSDe cooldown by swapping out. See Pendle PT and YT tokens explained for the yield-trading mechanics.
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sDAI integration is the broadest in absolute count, since DAI has been the longest-running CDP stablecoin in DeFi. But Sky is migrating the integration set to USDS and sUSDS over time. New integrations target sUSDS by default; legacy integrations continue to support sDAI without active development.
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sUSDS is the most frictionless. Stake USDS, receive sUSDS. Unstake at any time, receive USDS plus accrued yield. No cooldown, no exit penalty, no secondary-market discount required. Conversion to DAI or USDC is one swap away through Spark or any DEX.
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sDAI has the same instant-redemption profile as sUSDS. The friction is upstream: converting between DAI and USDS through the Sky upgrade contract takes one extra transaction. Holders converting fresh capital should consider going straight to USDS and skipping the DAI step.
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sUSDe has the most friction. The standard unstake path is a seven-day cooldown from sUSDe to USDe. Users who need liquidity faster trade sUSDe directly on Curve or other DEXs, accepting a small discount (typically under 30 basis points in calm markets, wider during stress). The discount prices the cooldown cost in. Sizing positions for the cooldown matters more than sizing for the headline APY in most stress scenarios.
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By track record, sUSDS (and sDAI, which shares the same underlying Sky protocol) carry the longest production history with nine years of CDP operation and consistent audit cadence. sUSDe is younger and carries additional offchain operational risk (perp venues, custody) but has performed reliably across multiple funding regimes since launch. The honest answer is they have different risk surfaces, not different absolute safety levels. See risks of yield-bearing stablecoins for the full taxonomy.
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USDS and DAI are the peg-targeted tokens; sUSDS and sDAI trade at exchange rates to their base that rise over time. A peg loss in USDS or DAI would propagate to the wrapper proportionally. Both bases have held peg through every stress event since 2020, including the March 2023 USDC depeg (DAI was briefly affected because of its USDC collateral; the issue was resolved within days and Sky has since rebalanced collateral mix).
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Depends on sizing and time horizon. For capital that can sit through a funding-flip window without forced exit, the long-run expected APY has historically outpaced the SSR. For capital that may need to exit during stress, the secondary-market discount on sUSDe during stress can wipe out months of accrued yield. Position sizing matters more than the headline APY.
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For new positions, sUSDS pays more and is the canonical track Sky is steering toward. For existing sDAI positions, migration is one transaction (sDAI to DAI, DAI to USDS, USDS to sUSDS) and gas-only. The pickup is the SSR minus DSR spread, which has run 50-150 bps across 2025-2026. Most holders should migrate unless there is a specific integration reason to stay on DAI.
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USDC yield platforms (Aave, Morpho, Sky-via-Spark) pay variable lending rates on USDC supply, typically 3-7% depending on utilization. sUSDS pays a fixed administered rate (3.75%). sUSDe pays a variable market rate (often higher than USDC lending but with tail risk). For a head-to-head, see best USDC yield platforms 2026 and the Sky Savings Rate deep dive.
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Sources and methodology. Supply figures and protocol TVL pulled from DeFiLlama on May 24, 2026. Sky Savings Rate per Sky governance via sky.money at the same date. sUSDe APY range verified against app.ethena.fi/yield and the Ethena transparency dashboard. Audit lineage cross-referenced against github.com/makerdao/audits and Ethena audits page. Figures refresh continuously; verify before deploying capital.
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