Summary
This RFC proposes onboarding Saturn’s sUSDat as a new yield source for Lazy Summer Protocol. sUSDat offers a differentiated yield opportunity with an estimated 11.5%+ APY plus token upside. sUSDat’s yield is derived via Strategy’s digital credit product, STRC.
Key highlights:
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Differentiated Real Yield Source – Saturn brings offchain public credit products onchain. sUSDat is backed by Strategy’s STRC, a preferred equity instrument targeting an 11.5% yield while seeking to maintain par value with low volatility.
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Scalable Yield - sUSDat is designed to maintain 11%+ base yield at billions in AUM.
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Institutional-grade Infrastructure and Transparency - Saturn works with Galaxy for STRC custody and trade execution, and integrates with Chainlink and Accountable to provide real-time proof of reserves, STRC price feeds, and a dedicated transparency page.
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Saturn token allocation – sUSDat accrues Saturn points, expected to convert into Saturn tokens at TGE.
Motivation
The Opportunity: Scalable, durable yield from Digital Credit
The DeFi landscape continues to evolve with new yield sources offering competitive returns. sUSDat offers structurally unique exposure to digital credit that differs from typical DeFi yield sources:
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11.5% Yield without Compression – STRC is designed to scale to large size without significant yield compression. Unlike trading strategies bound to the size or volume of crypto markets, STRC’s size is capped Strategy’s access to traditional capital market size. For context, Strategy was able to issue (and access the cash for) ~$900M of MSTR in a single week in March, which is equivalent to their yearly preferred dividend obligations.
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Robust Liquidity Profile – STRC is a publicly traded equity on the Nasdaq with ~$200M of average daily trading volume. STRC’s liquidity profile enables sUSDat to have efficient staking / unstaking without liquidators taking on extended duration risk as seen with other private credit RWAs.
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Institutional-grade infrastructure & transparency – Saturn uses Galaxy for custody and trade execution, Chainlink for oracle services, and Accountable for asset verification.
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Additional token incentives – Users benefit from the Saturn points program, with token upside at TGE.
Why
Lazy Summer users across different risk profiles could benefit from this yield source:
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Higher-risk vault users may value sUSDat’s competitive 11.5%+ APY.
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Lower-risk vault users may appreciate sr-sUSDat’s senior tranche structure and principal protection mechanism.
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DAO-managed vaults could benefit from a high APY source with built-in protection options to offset some riskier allocations.
Specifications
sUSDat
| Field | Value |
|---|---|
| Protocol | Saturn |
| Vault Type | ERC-4626 |
| Token | USDC |
| Network | Ethereum Mainnet |
| Contract Address | TBD (Whitelist required for access) |
| Est. APY | 12-15% + points |
| Protection Level | None |
| Minimum Deposit | N/A |
| Lockup | 3–7 day cooldown for unstake |
Yield Breakdown
sUSDat
sUSDat holders receive the yield passed through from USDat, the unstaked token backed by M0’s M earning 3.5% from tokenized treasuries.
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sUSDat net yield = STRC yield + USDat yield (Discretion/Depending on Staking Ratio)
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Estimated sUSDat yield = 11.5% + 3.5% = ~ 15%
- As of 03/22/2026, but USDat:sUSDat ratio is subject to change
How it works
To acquire sUSDat, Lazy Summer would first need to obtain USDat - either by minting it directly through Saturn after completing KYC, or by purchasing it on a DEX. Once USDat is acquired, it can be permissionlessly staked into sUSDat.
After users stake:
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The M0-backed treasuries underlying USDat are off-ramped.
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STRC is purchased via Galaxy as execution broker.
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STRC is held with Clear Street, Galaxy’s custody partner.
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STRC pays a ~11.5% annualized dividend monthly, which accrues to sUSDat holders via NAV appreciation.
The sUSDat exchange rate = total vault NAV / total sUSDat supply, updated dynamically onchain via Chainlink oracle (every 24 hours or on a 10 bps price move). Accountable provides independent, real-time proof-of-reserves verification, with a NAV oracle updating every 24 hours or on a 50 bps move.
Withdrawals are asynchronous: the fund rotates STRC back to USDat, which is redeemed to the user within a 3–7 day cooldown period.
sUSDat allocation breakdown
sUSDat will be backed 100% with STRC initially with a dynamic ratio depending on STRC risk analysis. The reserve dynamically allocates between Treasuries and digital credit based on the Loan-To-Value (LTV) of our digital credit strategy.
LTV = Total Liabilities Including All Obligations Senior to STRC / Value of Strategy’s Bitcoin NAV
A lower LTV signals a stronger Bitcoin & Equity buffer, while a higher LTV signals increased leverage and risk.
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Lower LTV: greater digital credit exposure for higher yield.
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Higher LTV: shift toward Treasuries for enhanced stability.
This adaptive model strengthens reserve stability under stress and optimizes yield during normal conditions.
Security
| Attribute | Details |
|---|---|
| Backers | YZi Labs, Sora Ventures, key angels from USDai, USDE, and USDH |
| Smart Contract Audits | Three Sigma + Certora (3 completed audits) |
| Oracle | Chainlink STRC Price(24hr / 10bps), NAV oracle (24hr / 50bps) |
| Proof of Reserves | Accountable - real-time verification of offchain STRC holdings |
| Custody | Clear Street (via Galaxy) - execution and custody functions separated |
| Access Control | OpenZeppelin role-based access (Processor, Compliance, Admin roles) |
| Blacklist / Pause | Supported for legal compliance and fund protection |
| Code | Open-source; upgradeable contracts |
| KYC | Required for USDat minting; permissionless for sUSDat staking |
Terms
| Term | Details |
|---|---|
| Entry Window | April 15th, 2026 - July 15th, 2026 (90 days) |
| Minimum Deposit | N/A |
| Principal Lockup | None - withdraw anytime (3–7 day processing cooldown) |
| Token Token Lockup | Top 200 Saturn token holders subject to a 50% 1-year cliff |
| Eligibility | KYC required for USDat minting; permissionless for sUSDat staking |
Entry closes when either:
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3 months elapsed from program start, OR
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$1B in total TVL reached
Once entry closes, no new deposits can enter and points allocation is finalized with no further dilution.
Risk considerations
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STRC Price Volatility – sUSDat exchange rate is calculated from NAV, which is subject to STRC market price fluctuations. STRC is designed to trade near $100 par with monthly rate resets, but short-term dislocations can impact NAV.
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On/Off-Chain Operations – The conversion of USDat to sUSDat requires on/off-ramp operations through Galaxy and Clear Street, posing operational and counterparty dependency risk.
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Dividend Deferral Risk – STRC dividends are formally discretionary, though Strategy has strong incentives to maintain them given ~$2.25B in cash reserves (~28.5 months of coverage) and demonstrated equity market access.
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Smart Contract Risk – Standard DeFi risks apply despite three completed audits. Both USDat and sUSDat contracts are upgradeable.
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Token Value Risk – Saturn points value is subject to market conditions and FDV at TGE.
Questions for the community
Seeking feedback from SUMR token holders, Block Analitica, and the Lazy Summer community on the following:
Informal support indicator
Should Lazy Summer DAO proceed with onboarding Saturn sUSDat?
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Yes - Onboard as a new yield source
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No - Do not onboard at this time
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Abstain - Need more information
If approved, which Lazy Summer vault is most appropriate for this yield source?
- Lower Risk USDC Vault on ETH
Discussion points for @BlockAnalitica & community @chrisb @halaprix @Sixty @jensei
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Risk Assessment – Does STRC’s senior position in Strategy’s preferred equity stack, Strategy’s strong access to equity markets, and Strategy’s ~28.5-month cash coverage provide sufficient yield stability for inclusion?
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Allocation Size – Given the 3–7 day withdrawal cooldown and asynchronous on/off-ramp operations, what allocation size and liquidity buffer would be appropriate for Lazy Summer?
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KYC Implications – What are the operational considerations for Lazy Summer DAO to complete KYC requirements for USDat minting? Can sUSDat be sourced via DEX to bypass this requirement?
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Token Exposure – How should Saturn points/token allocation be valued and distributed to vault depositors?
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Oracle & NAV Risk – Are the 24–25 hour oracle update cadences and 50 bps NAV tolerance acceptable parameters for vault NAV calculations and rebalancing?