FRAX vs DAI: Hybrid-Algorithmic vs Overcollateralized

FRAX vs DAI Overview

FRAX and DAI represent two fundamentally different approaches to decentralized stablecoin design. FRAX launched in December 2020 as the first fractional-algorithmic stablecoin, using a dynamic mix of collateral and algorithmic stabilization. DAI launched in 2017 as a purely overcollateralized stablecoin backed by crypto assets locked in smart contract vaults. Both protocols have since undergone major transformations: FRAX abandoned its algorithmic component in 2023, and DAI rebranded to USDS under the Sky Protocol in 2024.

Despite their convergence toward full collateralization, these protocols differ in collateral composition, governance structure, yield mechanisms, and regulatory positioning. The following table summarizes the key differences as of mid-2026.

For a broader view of the stablecoin landscape including centralized issuers, see our full stablecoin comparison tool.

Peg Mechanism Design

The core distinction between FRAX and DAI lies in how each protocol maintains its dollar peg. Their approaches reflect different philosophies about the tradeoffs between capital efficiency, decentralization, and stability.

FRAX: From Fractional-Algorithmic to Fully Backed

FRAX v1 introduced a novel hybrid collateral ratio that adjusted dynamically based on market conditions. When FRAX traded above $1, the protocol lowered its collateral ratio, requiring less backing per minted token. When it traded below $1, the ratio increased. The unbacked portion was stabilized through FXS seigniorage: minting FRAX required burning FXS proportional to the algorithmic fraction.

FRAX v2 (March 2021) introduced Algorithmic Market Operations (AMOs): autonomous smart contracts that deployed protocol-owned liquidity into Curve, Aave, and other venues. AMOs deepened FRAX liquidity without requiring additional collateral, but could not mint unbacked FRAX beyond the base stability mechanism.

In February 2023, FIP-188 passed with 98% approval to increase the collateral ratio to 100%, permanently eliminating the algorithmic component. FRAX v3 is fully backed. In January 2025, Frax launched frxUSD as the successor stablecoin, backed by BlackRock's BUIDL fund (US Treasury bills, cash, and repurchase agreements tokenized by Securitize).

DAI: Overcollateralized Vaults and PSM

DAI uses a straightforward overcollateralization model. Users deposit collateral (ETH, WBTC, stETH, USDC, and other approved assets) into Maker Vaults and can borrow DAI up to a protocol-defined ratio, typically 150% or higher depending on the collateral type. If the collateral value drops below the liquidation threshold, the vault is automatically liquidated through on-chain auctions.

The Peg Stability Module (PSM) provides a secondary mechanism: users can swap USDC for DAI at a 1:1 ratio (minus a small fee), creating a hard floor and ceiling around the peg. This was added in December 2020 after DAI repeatedly traded above $1 due to demand exceeding supply. The PSM made the peg tighter but introduced significant USDC exposure: USDC accounted for roughly 38% of DAI collateral as of early 2026.

Collateral Composition

The composition of collateral determines a stablecoin's risk profile, yield potential, and degree of decentralization. Both FRAX and DAI have shifted significantly toward real-world assets (RWAs), blurring the line between on-chain and traditional finance.

FRAX's pivot to BlackRock BUIDL for frxUSD backing represents a deliberate move toward institutional-grade collateral. DAI's collateral is more diverse but also more complex: the mix of on-chain crypto vaults, USDC PSM exposure, and off-chain Treasury holdings creates a layered risk profile. DAI's RWA allocation generates roughly 80% of Sky Protocol's fee revenue despite representing a smaller share of total collateral by value.

For a deeper analysis of how different reserve strategies affect stability, see our research on stablecoin peg mechanisms compared.

Yield Strategies: sFRAX vs sDAI

Both protocols offer yield-bearing vault tokens that let holders earn passive returns on their stablecoin holdings. These vaults follow the ERC-4626 tokenized vault standard, making them composable across DeFi protocols.

sFRAX and sfrxUSD

sFRAX is the legacy staking vault for FRAX. It distributes protocol yield weekly to depositors and targets the Federal Reserve's Interest on Reserve Balances (IORB) rate. As of March 2026, sFRAX yields approximately 0.72% APY with $56.5M in TVL. The low yield reflects the winding down of Legacy FRAX.

sfrxUSD is the successor vault for the new frxUSD stablecoin. It operates as a non-rebasing ERC-4626 vault with no unstaking fee, offering 5-8% APY through a combination of carry-trade strategies, AMO operations, and T-bill yield. sfrxUSD is natively supported on Ethereum, Fraxtal, Arbitrum, and Optimism with approximately $35M in TVL.

sDAI and sUSDS

sDAI was the original DAI Savings Rate vault, now largely deprecated in favor of sUSDS. The Sky Savings Rate (SSR) currently yields 3.75% APY, down from peaks above 8% in 2024. sUSDS holds approximately $5.5B in TVL, making it one of the largest DeFi yield products by deposits.

The SSR is funded by stability fees charged on Maker Vault borrowers, interest on US Treasury holdings, OTC crypto-backed lending revenue, and corporate debt returns. Sky Protocol also distributes 600 million SKY tokens per year to participating USDS holders through Sky Token Rewards (STRs), adding a governance token incentive layer on top of the base savings rate.

Note: Yield rates for both protocols fluctuate based on market conditions, protocol revenue, and governance decisions. The GENIUS Act, signed into law in July 2025, prohibits interest or staking payouts on qualifying "payment stablecoins," which may affect how both protocols structure yield products going forward.

Governance Models

Both FRAX and DAI are governed by their respective token holders, but their governance mechanisms differ in structure, token economics, and decision-making processes.

FRAX Governance (veFXS)

FRAX uses a vote-escrow model inspired by Curve. Holders lock their governance token (FRAX, formerly FXS) for periods ranging from one week to four years, receiving veFXS in return. A four-year lock grants 4 veFXS per token, with the balance decaying linearly toward expiry. Each veFXS equals one governance vote, with proposals requiring a two-day voting window and majority approval to pass. veFXS holders also direct FXS emissions to liquidity pools through a weekly gauge system and receive protocol revenue via FXS buybacks. The governance token (formerly FXS) was rebranded to FRAX on December 30, 2025, and serves as the native gas token for the Fraxtal L2.

DAI Governance (SKY, formerly MKR)

DAI's original governance token MKR was converted to SKY at a 1:24,000 ratio as part of the Sky Protocol rebrand in August 2024. SKY holders vote on stability fees, collateral parameters, savings rates, and protocol upgrades. The Sky Protocol also introduced Seal Rewards and activation rewards as additional incentive mechanisms. SKY has a market cap of approximately $1.4B (ranked #47 on CoinMarketCap), compared to FRAX's governance token at roughly $24M. Over 1 billion SKY tokens have been repurchased by the protocol through its buyback program.

Protocol Evolution

Both protocols have undergone transformative changes since launch, driven by market events, competitive pressure, and regulatory shifts. Understanding this evolution is essential for assessing where each protocol stands today.

FRAX: Three Versions in Five Years

FRAX v1 (December 2020) pioneered fractional-algorithmic design, dynamically adjusting its collateral ratio based on market demand. FRAX v2 (March 2021) introduced AMOs for autonomous liquidity deployment. The March 2023 USDC depeg during the Silicon Valley Bank crisis exposed FRAX's vulnerability: it fell to approximately $0.88 because a significant portion of its collateral was USDC. This event accelerated the passage of FIP-188, which moved FRAX to 100% collateralization. By January 2025, Frax launched frxUSD backed by BlackRock BUIDL, along with the Fraxtal L2, Fraxlend lending markets, Fraxswap (a TWAMM-based DEX), and frxETH liquid staking (53,835 ETH, approximately $113M in TVL).

DAI: From Black Thursday to Sky

DAI's defining crisis was Black Thursday on March 12, 2020. ETH crashed 43% in a single day, spiking gas prices above 200 Gwei and preventing liquidation bots from bidding in collateral auctions. Over $8.3M in collateral was liquidated for effectively 0 DAI, creating approximately $4.5M in unbacked DAI. MakerDAO responded by minting roughly 20,000 MKR to recapitalize and adding USDC as collateral on March 17, 2020.

The protocol grew steadily from there, reaching $10B in DAI supply by 2024. The "Endgame" plan culminated in the August 2024 rebrand to Sky Protocol, introducing USDS and SKY tokens. Major exchanges completed automatic DAI-to-USDS migration in early 2026: Binance delisted DAI trading pairs on April 7, and Coinbase completed its conversion by May 6.

Risk Profiles

No stablecoin is risk-free. FRAX and DAI carry distinct risk profiles shaped by their design choices and collateral strategies.

• Smart contract risk: both protocols rely on complex smart contract systems. DAI has a longer track record (since 2017) but also more legacy code surface area. FRAX's AMO system adds additional contract complexity.
• Collateral concentration: frxUSD depends heavily on BlackRock BUIDL as its primary backing. USDS has more diversified collateral but heavy USDC exposure (~38%) through the PSM introduces centralized issuer risk.
• Governance risk: FRAX's veFXS model concentrates voting power among long-term lockers. SKY governance has faced criticism for vote concentration, with just four entities accounting for nearly all votes in the rebrand approval.
• Regulatory risk: the GENIUS Act creates uncertainty for both protocols. frxUSD is explicitly designed for GENIUS compliance, while USDS's decentralized structure may not fit the "payment stablecoin" definition, potentially excluding it from legal protections.
• Liquidity risk: USDS has ~$10B in market cap and 400+ platform integrations. frxUSD at ~$125M is significantly smaller, which limits its liquidity depth and slippage characteristics in large trades.

How to Choose Between FRAX and DAI

The right choice depends on your priorities and use case.

If yield maximization is your primary goal: sfrxUSD currently offers higher APY (5-8%) compared to sUSDS (3.75%), though sfrxUSD's TVL is much smaller, which may affect exit liquidity for large positions.

If liquidity and ecosystem breadth matter most: USDS (DAI) is the clear winner with $10B in market cap, 400+ integrations, and native support on Ethereum, Base, and Solana. frxUSD is available on 25+ chains via LayerZero but has a fraction of the liquidity depth.

If regulatory compliance is a concern: frxUSD was explicitly designed to comply with the GENIUS Act and EU MiCA regulations. USDS's decentralized structure creates ambiguity around its regulatory classification.

If you want exposure to a broader DeFi ecosystem: Frax offers an integrated suite including Fraxlend, Fraxswap, frxETH liquid staking, and the Fraxtal L2. Sky Protocol focuses on its core lending and savings products but benefits from deeper third-party integrations.

For Bitcoin-native stablecoin use cases, neither FRAX nor DAI operates on the Bitcoin network. Users seeking dollar-denominated value on Bitcoin can explore USDB on Spark, which enables instant, near-zero-fee stablecoin transfers natively on Bitcoin without bridging.

Frequently Asked Questions

Is FRAX still an algorithmic stablecoin?

No. FRAX abandoned its algorithmic component in February 2023 when governance proposal FIP-188 passed with 98% approval to increase the collateral ratio to 100%. The successor token, frxUSD, launched in January 2025 and is fully backed by BlackRock's BUIDL fund (US Treasury bills, cash, and repurchase agreements). FRAX is now a fully collateralized stablecoin, not an algorithmic one.

What happened to DAI and MakerDAO?

MakerDAO rebranded to Sky Protocol in August 2024 as part of its "Endgame" plan. DAI was renamed to USDS (upgradeable at a 1:1 ratio), and MKR was converted to SKY at a 1:24,000 ratio. Major exchanges including Binance, Coinbase, and OKX completed automatic DAI-to-USDS migration in early 2026. Legacy DAI tokens remain technically active but are no longer traded on most platforms.

Which has higher yield: sFRAX or sDAI?

As of mid-2026, sfrxUSD (the successor to sFRAX) offers 5-8% APY, while sUSDS (the successor to sDAI) offers approximately 3.75% APY. However, sUSDS has dramatically more TVL (~$5.5B vs ~$35M for sfrxUSD), meaning better exit liquidity for large positions. Both rates are set by governance and fluctuate with market conditions and protocol revenue. For a broader yield comparison, see our stablecoin yield comparison tool.

Has FRAX or DAI ever lost its peg?

Both have experienced depeg events. FRAX fell to approximately $0.88 during the March 2023 Silicon Valley Bank crisis because of its USDC collateral exposure. DAI's worst crisis was Black Thursday (March 12, 2020), when ETH's 43% crash caused liquidation failures and DAI traded as high as $1.20 due to a supply shortage. Both protocols recovered and implemented changes to prevent recurrence.

How does the GENIUS Act affect FRAX and DAI?

The GENIUS Act, signed into law in July 2025, creates a federal framework for "payment stablecoins" requiring 1:1 reserves, monthly attestations, and the ability to freeze sanctioned addresses. It also prohibits interest or staking payouts on qualifying payment stablecoins. frxUSD was explicitly designed for GENIUS compliance. USDS's decentralized structure may not meet the "payment stablecoin" definition, potentially placing it outside the Act's scope and its legal protections.

What is the difference between frxUSD and Legacy FRAX?

Legacy FRAX is the original stablecoin launched in 2020, now in wind-down mode with a shrinking supply (~$240M market cap, deflating at roughly 12% per year). frxUSD is its successor, launched January 2, 2025, backed by BlackRock BUIDL and designed for regulatory compliance. Users holding Legacy FRAX can migrate to frxUSD, which is the actively supported stablecoin within the Frax ecosystem going forward.

Is DAI decentralized?

Partially. DAI (now USDS) was designed as a decentralized stablecoin with no single issuer and governance distributed among token holders. However, several factors limit its practical decentralization: USDC accounts for roughly 38% of its collateral via the PSM, RWAs held through off-chain trustees introduce traditional counterparty risk, and vote concentration in governance has drawn criticism. The protocol remains more decentralized than centrally issued stablecoins like USDC or USDT, but the tradeoffs are real.

This tool is for informational purposes only and does not constitute financial advice. Data is approximate and based on publicly available information as of mid-2026. Market caps, yield rates, collateral compositions, and regulatory statuses change frequently. Always verify current data on each protocol's official documentation before making financial decisions.