What Is DAI? MakerDAO's Decentralized Stablecoin Explained

DAI is a decentralized stablecoin that targets a value of one US dollar, but instead of being backed by dollars sitting in a bank account, it is backed by crypto assets locked in smart contracts called vaults. It was created by MakerDAO (now largely rebranded as Sky) and remains one of the longest-running examples of a stablecoin that isn't issued or controlled by a single company.

Understanding DAI means understanding the mechanism that keeps it stable without a bank in the middle, and knowing where the real risks sit.

How DAI is created

DAI enters circulation when a user locks collateral, historically ETH, but now a wider basket of crypto and real-world assets, into a Maker vault and generates DAI against it. This isn't a sale; it's closer to taking out a loan against your own assets. The user still owns the underlying collateral and can reclaim it by repaying the DAI plus a small "stability fee," which functions like interest.

Every vault must remain overcollateralized, meaning the value of the locked assets must exceed the value of the DAI issued against it, typically by a wide margin. This buffer exists because crypto collateral is volatile. If ETH drops sharply, the vault's safety margin shrinks along with it.

Why overcollateralization matters

A fiat-backed stablecoin like USDC is backed roughly 1:1 by cash and short-term treasuries. DAI takes a different approach: because its collateral (crypto) is far more volatile than dollars, the system requires collateral worth significantly more than the DAI it backs, often 150% or higher depending on the asset. This gives the system room to absorb price drops without becoming under-collateralized.

If a vault's collateral value falls below its required threshold, it becomes eligible for liquidation. Keepers (automated bots or individuals) can trigger the liquidation, seize the collateral, sell enough to cover the outstanding DAI, and return any surplus to the vault owner, though a penalty fee applies. This mechanism is what actually keeps the system solvent; understanding liquidation is essential background for anyone using leverage in DeFi.

Keeping the peg near $1

Overcollateralization alone doesn't guarantee DAI trades at exactly $1. Two additional mechanisms help:

• Arbitrage incentives. If DAI trades below $1, vault owners are incentivized to buy cheap DAI and use it to repay their debt (effectively buying it at a discount), which reduces supply and pushes the price back up. If DAI trades above $1, minting new DAI and selling it becomes profitable, increasing supply.
• The Dai Savings Rate (DSR). MakerDAO governance can raise or lower the interest rate paid to users who lock DAI in the savings module. Raising the DSR makes holding DAI more attractive, pulling demand and supporting the peg; lowering it does the opposite.

This is a more actively managed system than a purely algorithmic model, and it's part of why DAI has generally weathered market stress better than uncollateralized algorithmic experiments like the one behind the Terra UST collapse.

DAI vs fiat-backed stablecoins

Feature	DAI	USDC / USDT
Backing	Crypto collateral (overcollateralized)	Cash and short-term treasuries
Issuance	Permissionless via smart contract vaults	Centralized issuer mints/redeems
Custody risk	On-chain, self-custodied collateral	Bank/custodian counterparty risk
Transparency	Fully on-chain, publicly auditable	Periodic attestations or audits
Peg mechanism	Arbitrage, liquidations, savings rate	Direct 1:1 redemption

Neither model is risk-free. DAI trades bank counterparty risk for smart contract risk and crypto market volatility; fiat-backed stablecoins trade that volatility for reliance on a regulated custodian actually holding what it claims. Comparing fiat-backed vs crypto-backed stablecoins in more depth is worth doing before choosing which to hold.

Where DAI is used

DAI functions as a base unit of account across much of DeFi: as collateral in lending markets, as one side of liquidity pool pairs on DEXs, and as a way to gain dollar exposure without touching a centralized exchange. Because minting DAI happens on-chain via smart contracts rather than through a bank, it has historically been more resistant to certain forms of censorship than centrally issued stablecoins, though it's not immune to protocol-level governance decisions.

It's worth noting that DAI's collateral basket has evolved over the years to include a growing share of tokenized real-world assets like short-term bonds, which increases yield potential for the protocol but also introduces off-chain legal and counterparty considerations that didn't exist in the original all-crypto design.

Risks to understand

DAI is not risk-free simply because it's decentralized. Smart contract bugs, oracle failures (bad price feeds triggering incorrect liquidations), extreme volatility outpacing liquidation speed, and governance risk (token holders voting on parameters that affect the system) are all real considerations. The system has been stress-tested by several sharp market crashes and has generally held its peg, but "generally" is not "always," and no stablecoin should be treated as a risk-free savings account.

Bottom line

DAI shows that a stablecoin can maintain its dollar peg without a bank vault full of cash, using overcollateralization, liquidations, and interest rate adjustments instead. It trades one set of risks (custodian trust) for another (crypto volatility and smart contract risk), which makes it a genuinely different tool than fiat-backed alternatives, not simply a decentralized copy of them. Anyone holding or using DAI should understand the vault mechanism behind it rather than treating it as a black box that happens to say "$1."