DAI Stablecoin

What Is DAI?

DAI is a crypto-collateralized stablecoin that maintains a soft peg to the US dollar. It was created by MakerDAO, one of the oldest decentralized finance protocols on Ethereum, and launched in December 2017. Rather than relying on bank-held reserves like USDC or USDT, DAI is generated when users deposit cryptocurrency into smart contracts called Vaults and borrow DAI against that collateral.

The key innovation is decentralization: no single company controls DAI's issuance or reserves. The collateral backing every unit of DAI is verifiable on-chain, and all protocol parameters are set by MKR governance token holders through on-chain voting. This makes DAI one of the few stablecoins that operates without a centralized issuer, positioning it as a partially algorithmic and crypto-collateralized hybrid.

As of mid-2026, DAI has a circulating supply of approximately $4.7 billion. Combined with its successor token USDS, the Sky Protocol manages over $13 billion in stablecoin supply, making it the third-largest stablecoin issuer.

How It Works

DAI is created through a process of overcollateralization. Users deposit assets worth more than the DAI they wish to generate, creating a buffer that absorbs price volatility. The core mechanism revolves around Maker Vaults.

Vault Mechanics

To generate DAI, a user follows these steps:

1. Deposit a supported collateral asset (ETH, WBTC, stablecoins, or real-world assets) into a Maker Vault smart contract
2. Generate DAI up to the vault's maximum debt ceiling, determined by the collateral's liquidation ratio
3. Use the generated DAI freely: trade, lend, hold, or spend it
4. To reclaim the collateral, repay the DAI plus any accrued stability fee

Each collateral type has its own risk parameters. ETH-A vaults, the most common type, require a minimum collateralization ratio of 150%. This means depositing $1,500 worth of ETH to generate a maximum of 1,000 DAI. In practice, most users maintain ratios well above the minimum to avoid liquidation.

Collateral Types

DAI launched in 2017 as Single-Collateral DAI (SAI), accepting only ETH. The upgrade to Multi-Collateral DAI in November 2019 expanded the system to support dozens of asset types. Collateral categories include:

• Cryptocurrencies: ETH, WBTC, LINK, and other ERC-20 tokens with multiple vault types offering different risk/fee tradeoffs
• Stablecoins: USDC and other stablecoins used as collateral during high-volatility periods, often at near-100% ratios
• Liquidity provider tokens: tokens representing positions in decentralized exchanges
• Real-world assets (RWAs): tokenized US Treasury bills and other traditional financial instruments, first onboarded in April 2021 via Centrifuge

Stability Fee

The stability fee is a continuously accruing interest rate charged on DAI generated from Vaults. It functions like a borrowing cost: the longer you hold an open vault, the more DAI you owe when closing it. MKR governance sets the rate for each collateral type, adjusting it to influence DAI supply and demand. Higher fees discourage borrowing and reduce DAI supply, pushing the price up. Lower fees encourage borrowing and expand supply, pushing the price down.

Stability Mechanisms

DAI's dollar peg is maintained through several interlocking mechanisms that create economic incentives to keep the price near $1.00.

Liquidations

When a vault's collateral value drops below its minimum ratio, the position becomes eligible for liquidation. The system uses automated Dutch auctions (Liquidations 2.0, introduced after the Black Thursday incident in March 2020): auction prices start high and decrease over time, allowing keepers to purchase collateral at a discount and repay the vault's debt.

The liquidation penalty (typically 13% to 15%) is added to the vault's debt, incentivizing vault owners to maintain healthy collateralization ratios. Key auction parameters include the starting price multiplier, price decay rate, and maximum simultaneous auctionable debt: all tuned by governance.

// Simplified vault health check
const collateralValue = ethPrice * ethDeposited;
const collateralizationRatio = collateralValue / daiDebt;
const liquidationRatio = 1.50; // 150% for ETH-A

if (collateralizationRatio < liquidationRatio) {
  // Vault is unsafe — liquidation auction begins
  // Dutch auction: price starts at collateralValue * BUF
  // and decreases by CUT every STEP seconds
  triggerLiquidation(vaultId);
}

DAI Savings Rate (DSR)

The DSR is a variable interest rate paid to DAI holders who lock tokens in the DSR smart contract. It acts as a monetary policy lever: raising the DSR increases demand for DAI (users buy DAI to earn yield), which pushes the price up. Lowering the DSR reduces demand, pushing the price down. There is no lockup period or minimum deposit.

The DSR is funded by stability fees collected from vault owners, creating a closed economic loop between DAI borrowers (who pay fees) and DAI holders (who earn the DSR).

Emergency Shutdown

As a last resort, MKR holders can trigger Emergency Shutdown, which freezes the entire system and allows all DAI holders to redeem their tokens for the underlying collateral at current oracle prices. This mechanism exists to protect users in case of a governance attack, critical smart contract bug, or prolonged market collapse.

MKR Governance

The MKR token gives holders voting power over all protocol parameters: collateral types, risk parameters, stability fees, the DSR, and debt ceilings. Governance follows an on-chain model where token-weighted votes determine outcomes.

MKR also serves as the system's backstop. When the protocol operates profitably (stability fee revenue exceeds the DSR payout), surplus DAI is used to buy and burn MKR, reducing supply. When the system suffers bad debt that exceeds its surplus buffer, new MKR is minted and auctioned to recapitalize the protocol: diluting existing MKR holders but keeping DAI solvent. This mint and burn mechanism aligns MKR holders' interests with prudent risk management.

Evolution and the Sky Rebrand

DAI has undergone several major transformations since its launch:

• December 2017: Single-Collateral DAI (SAI) launches with ETH as the only accepted collateral
• November 2019: Multi-Collateral DAI (MCD) introduces the DSR, multiple collateral types, and the modern vault system
• March 2020: Black Thursday exposes auction vulnerabilities when ETH drops 43% in hours, leading to $8.3 million in zero-bid liquidations and $4.5 million in protocol bad debt
• April 2021: Real-world assets first onboarded as collateral via Centrifuge, bridging traditional finance instruments into the system
• September 2024: Sky Protocol rebrand goes live, introducing USDS (DAI successor) and SKY (MKR successor at a 1:24,000 conversion ratio)

The Sky rebrand, part of Maker's "Endgame" plan, aims to create a more modular and accessible ecosystem. DAI and MKR remain fully functional: users can convert between DAI and USDS at a 1:1 ratio, and between MKR and SKY at 1:24,000. However, major exchanges have begun auto-converting DAI balances to USDS, signaling a gradual migration.

Use Cases

DAI's decentralized nature makes it valuable in contexts where censorship resistance and transparency matter more than the regulatory certainty of fiat-backed alternatives.

• DeFi collateral: DAI is widely used across lending protocols, liquidity pools, and yield strategies as a stable unit of account that doesn't depend on a single issuer's banking relationships
• Leveraged exposure: traders deposit ETH, generate DAI, buy more ETH, and repeat: creating leveraged long positions without a centralized exchange or margin account
• Savings: the DSR provides a permissionless, variable-rate savings account accessible to anyone with an Ethereum wallet, requiring no KYC or minimum balance
• Cross-border transfers: DAI can be sent globally without intermediaries, useful in jurisdictions with limited banking access or capital controls
• Stablecoin diversification: protocols and treasuries hold DAI alongside USDC and USDT to reduce single-issuer risk

For Bitcoin-native stablecoin approaches, including stablecoins that operate on Layer 2 networks like Spark, see the stablecoins on Bitcoin landscape research article.

Risks and Considerations

Smart Contract Risk

DAI's entire collateral base sits in smart contracts on Ethereum. A critical vulnerability in the vault, auction, or oracle contracts could compromise the system. While the codebase has been extensively audited and battle-tested since 2017, complex smart contract systems carry inherent risk that cannot be fully eliminated.

Oracle Dependency

The system relies on price oracles to determine collateral values and trigger liquidations. During Black Thursday in March 2020, network congestion delayed oracle updates and prevented keeper bots from bidding in auctions, allowing attackers to win $8.3 million in collateral with zero-DAI bids. MakerDAO responded with the Liquidations 2.0 upgrade to Dutch auctions, but oracle manipulation remains a systemic concern for any overcollateralized system.

Governance Centralization

MKR governance voting is token-weighted, meaning large holders wield outsized influence. The November 2024 vote to retain the Sky branding illustrated this: four entities controlled nearly 98% of the votes cast. Governance attacks, voter apathy, or poorly calibrated risk parameters can threaten DAI's stability.

Collateral Composition Risk

As MakerDAO expanded collateral to include centralized stablecoins (USDC) and real-world assets, DAI's decentralization guarantee has weakened. If a significant portion of DAI is backed by assets that can be frozen or seized by centralized entities, DAI inherits some of the counterparty risk it was designed to avoid. The hybrid collateral approach creates tradeoffs between capital efficiency and censorship resistance.

Depeg Scenarios

While DAI has historically maintained its peg well, extreme market conditions can cause temporary deviations. A rapid collapse in ETH price could trigger mass liquidations, and if the auction system fails to clear debt efficiently, the protocol must mint new MKR as a backstop. Prolonged depeg events erode confidence and can create negative feedback loops. For a broader analysis of how stablecoins maintain their pegs, see the stablecoin peg mechanisms comparison.

This glossary entry is for informational purposes only and does not constitute financial or investment advice. Always do your own research before using any protocol or technology.