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DAI and USDS are not backed by a company holding dollars in a bank. They are backed by crypto and other assets locked in smart contracts, deliberately worth more than the tokens they support, and anyone can verify the whole arrangement on-chain at any moment.
That makes them the largest working example of a fundamentally different answer to the stablecoin problem. Where USDC and USDT ask you to trust an issuer and its accountants, Sky asks you to trust code, collateral ratios, and governance. This guide covers how that backing actually works, what sits in the collateral stack today, the difference between the two tokens, and the risks the model trades for its transparency.
Fiat-backed stablecoins remove the accountant's uncertainty by hiring an accountant. Sky removes the accountant entirely, and replaces that risk with collateral volatility and governance.
Key Takeaways
- Collateral, not reserves. Assets are locked in smart contracts, not held by a company.
- The system is overcollateralized. Roughly $14.39B in collateral against $10.6B in obligations.
- USDS is the flagship now. It overtook DAI in supply after the 2024 Sky rebrand.
- They convert one-for-one. Sky's official converter swaps DAI and USDS at par.
- Backing is verifiable live. No attestation delay, but governance risk replaces issuer risk.
How the Backing Actually Works
The mechanism is closer to a loan than a deposit, and understanding that single point makes everything else clear.
Instead of sending dollars to an issuer, a user locks approved collateral into an on-chain vault and mints new tokens against it. Repaying the debt burns those tokens and releases the collateral, so supply expands and contracts with borrowing demand rather than with dollar deposits.
The vault must always hold more value than it has borrowed. If collateral falls below the required ratio, the protocol liquidates the position automatically and auctions the assets, which is what keeps the system solvent through market crashes.
What Sits in the Collateral Stack
The collateral behind USDS in 2026 is more diversified than the crypto-only design the protocol launched with, and it now spans eight categories.
The largest component is other stablecoins, including USDC, USDT, and PYUSD held across peg stability structures and lending positions. Alongside those sit on-chain crypto lending positions, over-the-counter crypto lending, and short-duration US Treasury bills deployed through the protocol's allocators.
That last item is worth noticing. A protocol built as the decentralized alternative to fiat-backed tokens now holds Treasury bills and other stablecoins in its own collateral stack, which narrows the philosophical distance between the two models considerably.
The Overcollateralization Buffer
The number that matters is the gap between what the protocol owes and what stands behind it.
As of mid-2026, total protocol collateral stood at roughly $14.39 billion against about $10.6 billion in loan coverage. Independent analysis of the agent-level allocators put system-wide collateral near $13.9 billion backing around $11.9 billion of issued stablecoins, leaving roughly 116% coverage at that layer.
Individual vaults are typically overcollateralized well beyond that, often in the 110% to 200% range depending on the asset. The buffer exists to absorb price drops in volatile collateral before the tokens themselves are threatened, which is the structural equivalent of the excess reserves discussed in our guide to what backs Tether.
DAI or USDS: What Changed
The two-token situation confuses people, and the history explains it quickly.
DAI launched in December 2017 under MakerDAO, initially backed only by ETH, then moving to multi-collateral backing in 2019. In August 2024, MakerDAO rebranded to Sky and launched USDS as an upgraded flagship, alongside a new governance token.
Crucially, DAI was not deprecated. Holders can convert between DAI and USDS one-for-one through Sky's official converter in either direction, and both are backed by the same collateral system. USDS overtook DAI in circulating supply during 2025, but DAI still anchors billions across DeFi pools and networks where USDS has not deployed.
The Peg Stability Module
One component deserves separate attention because it is both the most effective peg tool and the biggest dependency in the design.
The Peg Stability Module lets users swap USDC for DAI or USDS at exactly $1.00 in either direction. When the token drifts above or below the peg, that swap creates instant arbitrage that pulls it back, which is why these tokens hold their peg more tightly than a purely crypto-backed design would.
The trade-off is that a meaningful share of effective backing becomes USDC. A decentralized stablecoin that relies on a centralized one for peg defense inherits some of that issuer's risk, which is the sharpest criticism of the model and worth weighing against the transparency it offers.
What You Trade for On-Chain Backing
The advantages are real. Collateral is visible on-chain in real time rather than in a monthly report; there is no corporate parent that could fail, and no bank account holding your backing that could be frozen over a weekend, which is exactly the failure mode described in our guide to what a stablecoin depeg is.
The risks simply move rather than disappear. Smart contract exploits, oracle failures feeding bad prices into liquidations, collateral volatility during sharp crashes, and governance decisions by token holders that change risk parameters are all live exposures the fiat-backed model does not have.
Sky's operating record is a genuine point in its favor here. The protocol has run through Black Thursday, the Terra collapse, FTX, and the Silicon Valley Bank failure without a core protocol exploit, which is close to a decade of stress testing.
Where It Fits Against USDT and USDC
Crypto-collateralized tokens are a small share of the market, with Sky's two tokens together around $13 billion against a market where fiat-backed coins hold roughly 90% of value.
The choice between models is not about which is safer in general but which risk you would rather carry. Fiat-backed tokens like those covered in our guide to what backs USDC concentrate risk in an issuer, its banks, and its accountants, with the compensation being simplicity and regulatory standing.
Sky concentrates risk in code, collateral prices, and governance, with the compensation being verifiability and the absence of a single company that can fail. Neither eliminates risk, and pretending otherwise is how people get surprised.
Conclusion
What backs DAI and USDS? Overcollateralized positions locked in smart contracts, spanning other stablecoins, on-chain and OTC crypto lending, and short-duration Treasury bills, with roughly $14.39 billion in collateral against $10.6 billion in obligations.
The two tokens share that same backing and convert at par, with USDS now the larger flagship and DAI continuing as the original. Both hold their peg partly through a module that swaps USDC at a dollar, which is the model's most effective tool and its most debated dependency.
The honest summary is that Sky offers a different trade rather than a better one. You give up the simplicity of a company holding dollars and receive collateral you can inspect yourself, along with a set of risks that live in code and governance rather than in a bank.
Read Next:
- What Backs USDC? Circle's Reserves Explained
- What Backs Tether? USDT Reserves Explained
- How Are Stablecoins Backed? Reserves, Attestations & Audits
FAQs:
1. What backs DAI and USDS?
Both are backed by overcollateralized positions locked in smart contracts rather than reserves held by a company, spanning other stablecoins like USDC, on-chain and OTC crypto lending, and short-duration US Treasury bills. Total protocol collateral stood at roughly $14.39 billion against about $10.6 billion in obligations in mid-2026.
2. What is the difference between DAI and USDS?
They share the same collateral system and convert one-for-one through Sky's official converter. DAI launched in 2017 under MakerDAO, while USDS arrived with the 2024 Sky rebrand as the upgraded flagship and overtook DAI in supply during 2025, though DAI remains active across DeFi.
3. Is DAI safer than USDC?
Neither is safer in general; they carry different risks. DAI removes issuer and bank risk by holding collateral on-chain where anyone can verify it, but adds smart contract, oracle, collateral volatility, and governance risk that fiat-backed tokens do not have.
4. Why does a decentralized stablecoin hold USDC?
The Peg Stability Module lets users swap USDC for DAI or USDS at exactly $1.00, creating arbitrage that defends the peg far more tightly than crypto collateral alone could. The trade-off is that a meaningful share of effective backing becomes USDC, importing some of that issuer's risk.
5. Has Sky ever been exploited?
The protocol has operated for close to a decade through Black Thursday, the Terra collapse, FTX, and the Silicon Valley Bank failure without a core protocol exploit. That record is a meaningful data point, though it is not a guarantee against future smart contract or governance failures.
Disclaimer:
This content is provided for informational and educational purposes only and does not constitute financial, investment, legal, or tax advice; no material herein should be interpreted as a recommendation, endorsement, or solicitation to buy or sell any financial instrument, and readers should conduct their own independent research or consult a qualified professional.
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