Unrewarded USDS

Unrewarded USDS refers to USDS balances that exist in circulation but are not earning yield through any of the Sky Protocol's three reward mechanisms: the Sky Savings Rate (via sUSDS), the Integration Boost, or USDS Token Rewards (including both SKY and Agent token rewards) ^[1]. The concept occupies a central position in Sky Protocol's economic architecture because unrewarded USDS represents stablecoin supply on which the protocol incurs no savings cost, creating a structural revenue advantage that funds the Surplus Buffer, Pioneer Chain incentives, and Smart Burn Engine operations.

The distinction between rewarded and unrewarded USDS emerged as a formal governance concept during the September 2024 transition from MakerDAO to Sky Protocol, when the introduction of the Sky Savings Rate at an initial 12.5% APY dramatically increased the protocol's interest expense relative to its predecessor Dai Savings Rate regime ^[28]. By the first quarter of 2025, the economics of rewarded versus unrewarded supply had become a central governance concern, as elevated savings rate payments contributed to a $5 million quarterly loss ^[28]. As of February 2026, USDS circulates at approximately $9.2 billion ^[29], while sUSDS — the tokenized savings position — accounts for roughly half that figure, implying that billions of dollars in USDS remain unrewarded across wallets, liquidity pools, lending protocols, and cross-chain deployments.

Definition and Scope

The Sky Atlas formally codifies unrewarded USDS as a defined governance term, establishing precise boundaries that determine how multiple protocol mechanisms — from savings rate calculations to Pioneer Chain funding — interact with idle stablecoin supply. Understanding the definition requires examining both the current Atlas specification and the forward-looking Laniakea design, which refines the concept for a multichain future.

Formal Atlas Definition

Section A.0.1.1.37 of the Sky Atlas provides the canonical definition: "Unrewarded USDS are USDS balances that are not receiving the Sky Savings Rate, Integration Boost or USDS Token Rewards. USDS Token Rewards include both SKY and Agent token rewards." ^[1] This definition is constructed as a negative — USDS is unrewarded unless it falls into one of three specific reward categories. The formulation deliberately avoids referencing where USDS is held or how it is used; only the presence or absence of an active reward mechanism determines the classification.

The Laniakea specification, which represents the target-state protocol design authored by Sky's architect Rune Christensen, provides a complementary definition oriented toward multichain deployment. In the Agent Primitives appendix, unrewarded USDS is defined as "bridged USDS not earning SSR through sUSDS, Integration Boost, or Agent holdings" ^[22]. This Laniakea formulation substitutes "Agent holdings" for the Atlas's broader "USDS Token Rewards," reflecting the architectural shift toward the Star agent framework where Stars manage reward distribution ^[22].

The Three Reward Pathways

USDS transitions from unrewarded to rewarded status through exactly three mechanisms, each serving a distinct segment of the stablecoin ecosystem:

Sky Savings Rate (via sUSDS) — The primary reward pathway. Users deposit USDS into the Sky Savings Rate smart contract and receive sUSDS, an ERC-4626 tokenized vault share whose exchange rate increases continuously at the SSR ^[2]^[27]. The SSR is structurally set at 0.3% below the Base Rate, with the spread decomposed into a 0.2% Distribution Reward Fee and a 0.1% Sky Spread retained by the protocol ^[3]. Governance adjusts the SSR through Executive Votes or the SP-BEAM (Stability Parameter Bounded External Access Module), which permits operators to modify the rate within a floor of 200 basis points and a ceiling of 3,000 basis points ^[20].
Integration Boost — A governance-approved mechanism that pays DeFi protocol partners the equivalent of the SSR on unrewarded USDS balances held within their smart contracts ^[4]. Integration Boost addresses a structural limitation: protocols that need to hold raw USDS — for liquidity provision, specific contract logic, or compatibility reasons — cannot easily wrap it into sUSDS ^[22]. The Atlas specifies that partners are "under no obligation to pass through any portion of Integration Boost payments to their users," though competitive dynamics are expected to encourage it ^[5]. Payments follow a weekly, biweekly, or monthly cadence depending on the partner agreement ^[21].
USDS Token Rewards — Users who deposit USDS into the Token Rewards module earn SKY governance tokens and Agent tokens (such as SPK and GROVE) ^[6]. The distribution rate is normalized each Executive Vote so that the effective yield equals the SSR: the protocol calculates the total dollar value needed to match the SSR for the period and divides by the current SKY market price to determine the token quantity distributed ^[7].

What Remains Unrewarded

Any USDS balance not actively participating in one of these three mechanisms is classified as unrewarded. Common categories include:

Wallet balances — USDS held in externally owned accounts (EOAs) without deposit into sUSDS or Token Rewards contracts
DEX liquidity pools — USDS paired with other tokens in automated market makers such as Uniswap, Curve, or Raydium, where the base token sits in pool contracts without SSR or Integration Boost coverage
Lending protocol collateral — USDS deposited as collateral on platforms like Aave or Morpho that have not been approved for Integration Boost
Cross-chain balances — USDS bridged to networks where native SSR infrastructure is not yet available or where Integration Boost has not been deployed
Operational buffers — USDS held by Prime Agents in SubProxy accounts, ALM Proxies, or PSM positions as part of their allocation mandates ^[8]

The Laniakea forecast model tracks unrewarded USDS as a distinct supply parameter (unrewarded_usds_user), defined as "USDS not earning savings rate" ^[23]. In the model's baseline scenario configuration, $3.7 billion out of a $9.65 billion total USDS base is projected as unrewarded — approximately 38% of total supply ^[25].

Technical Architecture

The mechanics governing unrewarded USDS are embedded in Sky Protocol's rate hierarchy, savings infrastructure, and multichain deployment framework. Each reward pathway operates through distinct smart contract interactions, creating a layered system where USDS can shift between rewarded and unrewarded status as it moves through the DeFi ecosystem.

Rate Hierarchy and the Base Rate

All reward rates in Sky Protocol derive from the Base Rate, defined in the Atlas as "the key interest rate in the system" that "defines all other rates by various spreads" ^[17]. The rate hierarchy establishes how much the protocol pays — and to whom — on different categories of USDS:

Rate	Relationship to Base Rate	Recipients
Sky Savings Rate (SSR)	Base Rate - 0.3%	sUSDS holders ^[3]
Agent Rate	Base Rate - 0.1%	Prime Agents on unrewarded balances ^[9]
Integration Boost	Equal to SSR	Partner protocol smart contracts ^[4]
Token Rewards	Normalized to SSR	USDS depositors in Token Rewards module ^[7]
Unrewarded USDS (end users)	0%	No recipient — protocol retains revenue

The 0.2% spread between the Agent Rate and the SSR equals the Distribution Reward Fee ^[9], meaning Prime Agents holding unrewarded USDS earn the SSR plus the Distribution Reward Fee as combined compensation. For sUSDS balances held by Prime Agents, the SSR already accrues natively, so an additional 0.2% top-up is paid through the Monthly Settlement Cycle to achieve Agent Rate parity ^[11].

The sUSDS Savings Mechanism

The sUSDS token implements the ERC-4626 tokenized vault standard, functioning as an exchange-rate-accruing wrapper around USDS deposits ^[27]. When users deposit USDS, they receive sUSDS tokens whose redemption value increases continuously as the SSR accrues. The savings rate does not integrate natively into the USDS ERC-20 token itself — holders must actively deposit into the savings contract to earn yield ^[2]. This architectural choice creates the structural condition for unrewarded USDS: any USDS not deposited into the savings contract, the Integration Boost program, or the Token Rewards module earns zero yield by default.

The SSR is not fixed. Governance can modify it through Executive Votes, and the SP-BEAM module allows authorized operators to adjust the rate within bounded parameters: a minimum of 200 basis points (2%), a maximum of 3,000 basis points (30%), and a step size of 400 basis points (4%) per adjustment ^[20]. Historical SSR settings have ranged from an initial 12.5% at the September 2024 launch down to 4.5% following a series of governance-approved reductions in early 2025 ^[28].

Integration Boost Mechanics

The Integration Boost operates as a manual analogue to the savings rate, designed for contexts where sUSDS integration is impractical. The Atlas specifies the payment formula directly: "Sky makes payments to Integration Boost partners equal to the Sky Savings Rate times the Unrewarded USDS balances in their protocol" ^[4]. Partner protocols must submit verifiable on-chain deposit data, with the Core Council Risk Advisor calculating net deposits through dedicated API endpoints for Ethereum and Solana ^[4].

As of February 2026, active Integration Boost instances documented in the Atlas agent artifacts include Solana-based protocols Kamino, Drift, Save Finance, and Lifinity, all operating under the Keel Prime Agent's oversight ^[4]. Integration Boost recipients are additionally eligible for the Distribution Reward — a separate 0.2% annualized fee on qualifying USDS and sUSDS balances ^[15] — though no balance can receive Distribution Reward payments from multiple sources simultaneously ^[16].

Protocol Economics

Unrewarded USDS occupies a paradoxical position in Sky Protocol's financial model: it represents a loss of yield for individual holders but generates structural revenue advantages for the protocol as a whole. The economic dynamics of unrewarded supply directly influence profitability, surplus accumulation, and the sustainability of the protocol's incentive programs.

Revenue Impact

Sky Protocol generates revenue primarily through Stability Fees charged on vault borrowers who mint USDS against collateral, and through yield on Real-World Asset (RWA) allocations. These revenue streams accrue regardless of whether the minted USDS subsequently enters the savings contract ^[18]. The protocol's cost structure, by contrast, scales with the quantity of rewarded USDS: SSR payments to sUSDS holders, Integration Boost disbursements to partner protocols, and Token Reward emissions all represent expenses proportional to the rewarded supply base.

The Laniakea whitepaper frames the net revenue formula as: Net Revenue = (Base Rate x Deployed Capital) - (Savings Rate x sUSDS Deposits) ^[24]. Unrewarded USDS increases the first term (deployed capital generating fees) without increasing the second term (savings obligations), creating a direct positive contribution to net revenue. The Laniakea current accounting framework classifies SSR, Integration Boost, and DSR payments collectively as "Savings" expense — the cost of capital paid to attract and retain USDS supply ^[26]. In fiscal year 2025, this Savings category totaled approximately $194 million out of $285 million in total expenses, representing roughly 68% of all protocol spending ^[26].

The Q1 2025 experience illustrated the sensitivity of this dynamic. With the SSR at 12.5% and a large share of USDS in the savings contract, interest payments exceeded revenue growth, producing a $5 million quarterly loss — Sky Protocol's first loss since the rebrand ^[28]. A governance liaison characterized the situation directly: "USDS is a major drag on earnings. DAI makes money. USDS, not so much" ^[28]. The subsequent reduction of the SSR from 12.5% to 4.5% over six weeks was a policy response targeting the rewarded-to-unrewarded ratio, reducing the per-unit cost of rewarded USDS to restore profitability.

Agent Rate Compensation

While end users holding unrewarded USDS earn nothing, Prime Agents (the institutional operators within Sky's Star framework) receive explicit compensation for their unrewarded balances through the Agent Rate. The Atlas defines this as "the rate that Prime Agents earn on Unrewarded USDS, Dai, and sUSDS balances that they hold" ^[8], set at 0.1% below the Base Rate ^[9]. Prime Agents receive the full Agent Rate on unrewarded USDS and DAI balances through the Monthly Settlement Cycle ^[10].

This compensation mechanism reflects a deliberate design choice. Prime Agents hold unrewarded USDS in operational contexts — SubProxy accounts, ALM (Asset-Liability Management) Proxies, and PSM positions — as part of their mandate to maintain peg stability and manage capital allocation ^[8]. Without Agent Rate compensation, Stars would bear the full opportunity cost of holding idle capital for protocol infrastructure, creating a misalignment between their operational duties and economic incentives.

Surplus Buffer Dynamics

The Surplus Buffer — defined as "the difference between Sky's assets and liabilities" ^[18] — grows when protocol revenue exceeds expenses. Because unrewarded USDS generates no savings expense, it contributes to surplus accumulation more efficiently than rewarded supply. Revenue from Stability Fees and RWA yields on vaults whose minted USDS remains unrewarded flows directly into the Surplus Buffer without offset.

The Surplus Buffer funds downstream protocol operations through a waterfall allocation: expenses are deducted from gross revenue at Step 0, with remaining net revenue flowing to subsequent allocation steps including Smart Burn Engine operations, treasury management, and reserve accumulation ^[19]. Among the Step 0 expenses are SSR payments to sUSDS holders, SSR payments through Integration Boost, Distribution Rewards, Reimbursement Rewards, and Pioneer Rewards ^[19] — each of which reduces the Surplus Buffer only insofar as USDS is rewarded through the corresponding mechanism.

Role in the Sky Ecosystem

Beyond its direct impact on protocol economics, unrewarded USDS serves as a calculation basis for two major ecosystem mechanisms: the Pioneer Chain incentive system and the Allocation System's Agent Rate compensation.

Pioneer Chain Incentive Pool

The Pioneer Chain Primitive uses unrewarded USDS as the funding basis for chain expansion incentives. The Atlas specifies that "each Monthly Settlement Cycle, an amount of funds equivalent to the Sky Savings Rate multiplied by the balance of Unrewarded USDS is paid into a separate account controlled by the Pioneer Prime (the 'Pioneer Incentive Pool')" ^[12]. This payment splits 80/20: eighty percent must be used as incentives to promote general USDS adoption on the Pioneer Chain, while the remaining twenty percent may be retained by the Pioneer Prime as income ^[12].

The formula — Pioneer Incentive Pool = SSR x Unrewarded USDS (on Pioneer Chain) — creates a direct financial incentive for Pioneer Stars to grow USDS deployment on their chains. As more USDS bridges to a Pioneer Chain without converting to sUSDS or receiving Integration Boost, the Pioneer Star's income pool expands ^[12]. Conversely, when Integration Boost is deployed to a protocol on a Pioneer Chain, that USDS becomes "rewarded" and exits the Pioneer Incentive Pool calculation — the two mechanisms are mutually exclusive at the balance level ^[22].

This interaction between Integration Boost and Pioneer Rewards creates a strategic tension for Pioneer Stars. Deploying Integration Boost to partner protocols converts unrewarded USDS into rewarded USDS, improving yield for those protocol users but reducing the Pioneer Star's own incentive pool funding. The Laniakea design treats this as a self-regulating mechanism: Pioneer Stars are incentivized to grow total USDS supply on their chain (increasing the unrewarded base) while selectively deploying Integration Boost where it generates the highest marginal adoption ^[22].

Allocation System

Within the Allocation System Primitive, unrewarded USDS appears in a distinct operational context. When Prime Agents hold USDS in SubProxy accounts, ALM Proxies, or PSM positions, that USDS meets the formal definition of unrewarded — it is not earning the SSR, receiving Integration Boost, or generating Token Rewards ^[8]. The Agent Rate mechanism compensates Prime Agents for holding these operational balances, effectively internalizing the cost of peg stability infrastructure so that Stars do not bear the full opportunity cost of idle capital ^[9].

The Laniakea prime settlement methodology further distinguishes between idle USDS and idle sUSDS in its five-step settlement calculation: idle USDS earns the Base Rate as reimbursement, while idle sUSDS earns only the spread above the Base Rate since the SSR portion already accrues natively ^[11]. This tiered settlement ensures that neither token type is over- or under-compensated in the agent framework.

Distribution Reward Interaction

The Distribution Reward operates alongside unrewarded USDS mechanisms without changing a balance's rewarded/unrewarded classification. A protocol receiving Integration Boost on its unrewarded USDS balances is simultaneously eligible for the Distribution Reward — a standard 0.2% annualized fee on qualifying USDS and sUSDS balances ^[13]^[15]. From January 2026, an additional 0.3% Boosted Distribution Reward Rate became available for qualifying integrators, bringing the maximum Distribution Reward to 0.5% annually ^[14]. Distribution Rewards are classified as a Rewards expense in the Laniakea accounting framework — distinct from the Savings classification applied to SSR and Integration Boost payments ^[26].

Historical Context

The structural dynamics of unrewarded stablecoin supply predate the formal "Unrewarded USDS" terminology, tracing back to the early DAI ecosystem where the same economic logic applied under different names.

From the Dai Savings Rate to the Sky Savings Rate

Under MakerDAO's governance, the Dai Savings Rate (DSR) functioned as the sole savings mechanism for DAI holders. However, DSR utilization remained low for most of its existence — in August 2023, approximately 9% of DAI holders used the DSR even at an 8% rate ^[28]. This low utilization meant that the vast majority of circulating DAI was effectively "unrewarded," generating Stability Fee revenue for the protocol without incurring savings rate expense. The Enhanced DSR (EDSR) introduced tiered rates to manage costs as utilization grew, throttling payouts above certain utilization thresholds.

The September 2024 rebrand introduced USDS and the Sky Savings Rate, set initially at 12.5% to incentivize migration from DAI ^[28]. The elevated rate succeeded in attracting deposits — the savings contract reached $3 billion in assets under management — but also dramatically increased the protocol's interest expense. Many holders converted DAI to USDS specifically to capture the higher yield, converting previously unrewarded balances into rewarded ones without generating new collateral demand to offset the cost ^[28].

The Q1 2025 Profitability Crisis

The first quarter of 2025 exposed the economic consequences of a high reward ratio. Sky Protocol reported a $5 million loss versus a $31 million profit in Q4 2024 ^[28]. Interest payments had increased by 102% as USDS adoption incentivized broader savings participation. CoinDesk reported that much of the supply growth "came from Ethena depositing over $450 million into staked USDS — essentially redirecting yield rather than generating new users" ^[28]. This dynamic — where existing capital migrated to rewarded status without expanding the fee-generating collateral base — illustrated the protocol's sensitivity to the rewarded-to-unrewarded ratio.

Governance responded with a rapid series of SSR reductions: from 12.5% to 8.75% on February 10, 2025; to 6.5% on February 24; and to 4.5% on March 24, 2025 ^[28]. By Q2 2025, DSR and SSR expenses had fallen 51% to $34 million, restoring profitability.

Current State

As of February 2026, the Sky Frontier Foundation estimates USDS circulating supply at approximately $9.2 billion, having grown 74% over the previous year ^[29]. The Foundation projects a target of $21 billion in USDS supply with an estimated $611 million in gross ecosystem revenue for 2026 ^[29]. sUSDS supply accounts for approximately $5 billion of the total, implying that roughly $4.2 billion in USDS — approximately 46% of circulating supply — remains unrewarded through the savings mechanism alone.

The Laniakea forecast model's baseline scenario projects $3.7 billion in unrewarded USDS user balances against a $9.65 billion total supply (approximately 38%), suggesting that additional USDS is captured by Integration Boost and Token Rewards beyond what the raw sUSDS gap indicates ^[25]. The remaining gap between the forecast model's 38% and the observed ~46% sUSDS-based estimate likely reflects balances receiving Integration Boost payments or Token Rewards that are classified as "rewarded" despite not being held as sUSDS.

Metric	Approximate Value	Source
USDS total supply	$9.2 billion	Sky Frontier Foundation, February 2026 ^[29]
sUSDS supply	~$5 billion	Market data, February 2026
Sky Savings Rate	4.5% APY	Governance vote, March 2025 ^[28]
Laniakea model unrewarded projection	$3.7B (38% of base)	Forecast model scenario ^[25]
FY 2025 Savings expense	~$194 million	Laniakea accounting framework ^[26]

The SSR has remained at 4.5% since March 2025, reflecting governance's preference for moderate reward costs following the Q1 2025 loss. The DSR continues to operate in parallel at 3.5%, but the Atlas mandates that it "must gradually be reduced to 0% over time," concentrating future savings activity in the SSR ^[20].

Criticism and Debate

The unrewarded USDS dynamic has generated governance debate across several dimensions, reflecting tensions between protocol profitability, user experience, and competitive positioning.

User Experience and Yield Accessibility

Critics note that USDS earns zero yield by default, requiring active steps to convert to sUSDS or deposit into Token Rewards — a friction point that competitors like Ethena's USDe or rebasing stablecoins address through native yield mechanisms. Blockworks reported that "smaller users have pulled back from reward participation" while "the sweet spot for sUSDS is really these large, more institutional-type holders," suggesting that unrewarded USDS disproportionately affects retail participants who may not be aware of or equipped to access the savings contract ^[30].

Integration Boost Allocation Debate

The AEP-8 governance proposal, introduced by GFX Labs in February 2025 and resubmitted in March 2025, argued that Integration Boost funding should be focused exclusively on cross-chain adoption rather than Ethereum-native protocols. The proposal contended that Ethereum-native USDS could more easily convert to sUSDS, making Integration Boost on mainnet less necessary. The proposal was ultimately rejected, with governance affirming that Integration Boost serves legitimate needs across all chains ^[4].

Protocol Subsidy Concerns

The Pioneer Incentive Pool formula — SSR multiplied by unrewarded USDS on a Pioneer Chain — has raised questions about whether the protocol effectively subsidizes Pioneer Stars at the expense of savings available for the Surplus Buffer. Each dollar of unrewarded USDS on a Pioneer Chain generates an SSR-equivalent payment to the Pioneer Star, funds that would otherwise accrue to the protocol surplus ^[12]. Defenders argue that the Pioneer mechanism is self-regulating: as USDS adoption grows on a Pioneer Chain and more balances convert to sUSDS or receive Integration Boost, the unrewarded pool shrinks, naturally reducing the Pioneer subsidy ^[22].

Future Development

The Laniakea specification envisions a future where the SSR is determined algorithmically based on USDS price stability and Actively Stabilizing Collateral (ASC) liquidity, rather than through governance votes ^[27]. This algorithmic approach would dynamically adjust the cost of rewarding USDS, potentially influencing the equilibrium between rewarded and unrewarded supply in real time.

The broader stablecoin market opportunity — estimated at over $300 billion in idle stablecoins not earning yield ^[24] — suggests that Sky Protocol's demand-side primitives (SSR, Integration Boost, Distribution Rewards) will continue evolving to capture unrewarded supply both within and beyond the Sky ecosystem. SkyLink, the protocol's multichain solution, is designed to make core Sky features — including native SSR, native Token Rewards, and native USDC-to-USDS conversion — available across all deployed chains, potentially reducing the structural conditions that create unrewarded USDS on secondary networks ^[29].

USDS - The stablecoin whose balances are classified as rewarded or unrewarded
sUSDS - The yield-bearing ERC-4626 token representing USDS deposited into the Sky Savings Rate
Sky Savings Rate - The variable rate earned by sUSDS holders and used to calculate Integration Boost payments
Integration Boost - The mechanism paying SSR-equivalent yield on unrewarded USDS in partner protocols
Distribution Rewards - The companion demand-side primitive paying integrators a 0.2% fee on qualifying balances
Allocation System Primitive - Contains the formal Atlas definition of Unrewarded USDS and the Agent Rate compensation mechanism
Pioneer Chain Primitive - The framework where Pioneer Incentive Pool funding is calculated from unrewarded USDS
Sky Token Rewards - One of three mechanisms that classifies USDS as rewarded under the Atlas definition
DAI - The predecessor stablecoin that faced the same structural yield gap for balances held natively in DeFi contracts
Keel - Solana's Pioneer Prime whose Pre-Pioneer Incentive Pool is funded by SSR applied to unrewarded USDS