The Maker Protocol, now evolved into the Sky ecosystem, stands as one of the most influential decentralized finance (DeFi) platforms on Ethereum. Since its inception in 2015, it has pioneered innovations in stablecoin technology, decentralized governance, and real-world asset (RWA) integration. This comprehensive guide explores the core components of the Sky Protocol—its stablecoins, vault mechanisms, governance model, and risk management systems—while highlighting how users can interact with and benefit from this robust financial infrastructure.
An Overview of the Sky Protocol and Its Features
The Sky Protocol is a decentralized application (dApp) built on the Ethereum blockchain, designed to enable the creation of collateral-backed stablecoins. Governed by holders of the MKR token, the protocol operates through a transparent, community-driven decision-making process known as scientific governance. This includes Executive Voting and Governance Polling, ensuring that all changes to risk parameters, system upgrades, and asset approvals are made with broad consensus.
Each MKR token staked in a voting contract grants one vote, empowering stakeholders to directly influence the direction and stability of the ecosystem. The protocol's resilience lies not only in its smart contract architecture but also in its global network of contributors, developers, and autonomous teams who continuously refine its functionality.
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The Dai Stablecoin: A Decentralized Store of Value
Dai is a decentralized, over-collateralized cryptocurrency soft-pegged to the US dollar. Unlike centralized stablecoins backed by fiat reserves, Dai maintains its peg through a combination of smart contracts, collateral assets, and dynamic monetary policy tools controlled by Sky Ecosystem Governance.
Users generate Dai by depositing approved collateral—such as ETH or WBTC—into Sky Protocol Vaults. These vaults allow individuals to borrow against their holdings without selling them, providing liquidity while retaining exposure to asset appreciation. Once created, Dai can be used like any digital currency: sent peer-to-peer, spent for goods and services, or held as a stable store of value during market volatility.
Key Monetary Functions of Dai
Dai fulfills the four essential roles of money:
- Store of Value: As a stablecoin, Dai preserves purchasing power even amid crypto market swings.
- Medium of Exchange: Accepted across numerous DeFi platforms and merchant services globally.
- Unit of Account: Used within dApps for pricing transactions and tracking balances.
- Standard of Deferred Payment: Facilitates debt settlement within the protocol via repayment of generated Dai plus Stability Fees.
Every Dai in circulation is backed by excess collateral stored on-chain, making all transactions fully auditable and transparent on the Ethereum blockchain.
USDS: The Next-Generation Stablecoin
In 2025, following the rebrand from MakerDAO to Sky, the ecosystem introduced USDS, a new dollar-pegged stablecoin designed for global scalability and regulatory alignment. Like Dai, USDS is collateral-backed and operates within the Multi-Collateral Dai (MCD) framework.
What Sets USDS Apart?
While functionally similar to Dai, USDS introduces forward-looking features aimed at institutional adoption:
- Potential Freeze Functionality: Although not yet active, USDS uses an upgradeable proxy (ERC1967) that allows for future implementation of a freeze mechanism via governance vote. This feature could align with legal requirements in jurisdictions where Sky seeks enforcement capabilities over RWA-backed positions.
- Transparent Governance Process: Any future activation would require extensive community discussion and be subject to checks and balances under the Sky Atlas governance framework.
- Decentralized Appeals Mechanism: Ensures fairness in rare cases where freezes might be considered.
USDS can be obtained through:
- Direct conversion from Dai via a free, liquid converter contract
- Earning yields through the Sky Savings Rate (SSR)
- Receiving rewards via Sky Token Rewards (STR)
- Trading on third-party exchanges and DeFi protocols
How Sky Vaults Enable Collateralized Borrowing
Sky Vaults are smart contracts that let users lock up digital assets to generate Dai or USDS. Each vault is non-custodial—users retain full control of their collateral as long as they maintain sufficient collateralization ratios.
Step-by-Step Vault Interaction
- Create and Collateralize a Vault
Use interfaces like Oasis Borrow or community-built tools (e.g., Zerion, Instadapp) to open a vault and deposit supported assets. - Generate Dai/USDS
After funding, initiate a transaction to mint stablecoins against your locked collateral. - Repay Debt and Stability Fee
To reclaim collateral, repay the borrowed amount plus the accruing Stability Fee—paid exclusively in Dai or USDS. - Withdraw Collateral
Once debt is cleared, withdraw your assets back to your wallet. Empty vaults remain usable for future deposits.
Each collateral type requires a separate vault, enabling users to diversify across multiple assets.
Risk Management: Liquidations and Auctions
To protect the system from undercollateralization, the Sky Protocol automatically liquidates risky vaults when their value drops below predefined thresholds.
Liquidation Ratio and Triggers
The Liquidation Ratio varies per asset based on volatility. For example:
- ETH may have a 150% ratio
- Less volatile assets may require only 110%
When breached, Keepers—automated bots or traders—instantly trigger liquidation auctions.
Auction Mechanisms
- Collateral Auctions: Sell off liquidated assets for Dai to cover debt + penalties.
- Reverse Collateral Auctions: Initiate after full debt coverage to return surplus collateral efficiently.
- Debt Auctions: Mint MKR if system deficits occur, selling it for Dai to recapitalize.
- Surplus Auctions: Distribute excess protocol revenue by auctioning surplus Dai for MKR, which is then burned.
These mechanisms ensure solvency even during extreme market conditions.
Real World Asset (RWA) Vaults: Bridging Traditional Finance
Sky was among the first DeFi protocols to integrate RWAs—off-chain assets like bonds, real estate, or loans—into its collateral base.
How RWA Vaults Work
Unlike traditional crypto-backed vaults, RWA vaults involve:
- Legal agreements governing asset ownership
- Third-party custodians securing physical assets
- Off-chain valuation and compliance processes
Key components include:
- RWA Urn: The vault instance managed by governance-approved entities
- RWA Token: Non-transferable digital representation of the asset
- RWA Oracle: Updates price data and legal documentation (via IPFS hash)
Liquidation occurs off-chain over weeks or months through legal proceedings.
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The Role of External Actors
Keepers
Automated actors who maintain price stability by arbitraging Dai toward its $1 peg and participating in auctions.
Price Oracles
Decentralized nodes feed real-time asset prices into the system via trusted Oracle Feeds. Data passes through the Oracle Security Module (OSM), delaying updates by one hour to prevent manipulation.
Emergency Oracles
Act as last-resort defenders, capable of freezing compromised oracles or triggering Emergency Shutdown.
The Dai Savings Rate (DSR) and Sky Savings Rate (SSR)
The Dai Savings Rate allows any Dai holder to earn passive yield by locking funds in a dedicated smart contract. Accessible via SummerFi or other gateways, DSR adjusts dynamically:
- Increased when Dai trades below $1 to boost demand
- Decreased when above $1 to reduce scarcity
In 2025, USDS launched with the Sky Savings Rate, using ERC4626 tokenized vault standards for enhanced interoperability.
Governance of the Sky Protocol
MKR holders govern every aspect of the protocol—from risk settings to system upgrades.
Core Governance Tools
- Proposal Polling: Gauges community sentiment before formal votes
- Executive Voting: Enacts binding changes via Proposal Contracts
- Governance Security Module (GSM): Delays execution up to 24 hours for emergency review
Key Risk Parameters Controlled by Governance
| Parameter | Purpose |
|---|---|
| Debt Ceiling | Caps total borrowing per collateral type |
| Stability Fee | Interest rate paid on generated debt |
| Liquidation Ratio | Minimum collateral-to-debt threshold |
| Liquidation Penalty | Discourages undercollateralization |
| Auction Durations | Controls speed of liquidation processes |
Risk Mitigation Strategies
Despite strong design principles, risks remain:
- Smart Contract Vulnerabilities: Mitigated through formal verification, audits, and bug bounties.
- Black Swan Events: Addressed via diversified collateral, OSM delays, and Emergency Shutdown.
- Market Irrationality: Managed via DSR adjustments and Keeper incentives.
- User Complexity: Reduced through improved documentation and intuitive UIs.
- Technology Risks: Accepted as inherent in experimental systems; mitigated through rigorous testing.
Emergency Shutdown: Last Resort Protection
Emergency Shutdown halts all operations to protect user assets during crises. It unfolds in three phases:
- Freeze system and allow vault owners to withdraw excess collateral
- Complete all outstanding auctions
- Enable Dai holders to claim proportional collateral at Target Price ($1)
Though rare, this mechanism ensures final recourse in worst-case scenarios.
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Frequently Asked Questions (FAQ)
Q: What backs the value of Dai?
A: Dai is over-collateralized by digital assets like ETH and WBTC locked in Sky Vaults. Every Dai is backed by more than $1 worth of collateral.
Q: Can I lose money using Sky Vaults?
A: Yes—if your collateral value drops below the Liquidation Ratio, your position may be liquidated with a penalty fee applied.
Q: How does USDS differ from traditional stablecoins?
A: USDS combines decentralization with potential regulatory compliance features like upgradeable freeze functions—only activatable via community vote.
Q: Who controls the Sky Protocol?
A: No single entity does. MKR token holders collectively govern through transparent voting mechanisms.
Q: Is my Dai safe during a market crash?
A: The system is designed to remain solvent via liquidations and surplus buffers. In extreme cases, Emergency Shutdown protects holder claims.
Q: Can I earn yield on my stablecoins?
A: Yes—via the Dai Savings Rate (DSR) for Dai holders and Sky Savings Rate (SSR) for USDS users.
This document reflects the state of the Sky Protocol as of early 2025, integrating years of development since the original 2017 white paper. By combining decentralization with institutional-grade financial tools, Sky continues to lead the evolution of open, transparent, and globally accessible finance.