Stablecoin Peg Stability: USDS, DAI, and USDE Compared

Stablecoins aren't cash. They're just code wrapped in financial engineering. Over the 90 days ending August 5, 2026, USDS, Dai, and Ethena USDe all posted a net price change of 0%. Flat line on paper, sure. But look under the hood and secondary market prices kept twitching. Those tiny slips show how fast liquidity pools, protocol redemptions, and hungry arbitrageurs step in when order flow shifts.

Market Capitalization and Volatility Baselines

Size means depth, plain and simple. USDS rules this group with a massive $9.84 billion market cap. Dai sits in second at $4.59 billion, while Ethena USDe holds $3.90 billion. Big balance sheets build deep exchange order books, soaking up sudden trades without slipping the spot price.

Price swings across all three stayed quiet over the 90-day window. Both USDS and Dai notched an annualized volatility of 0.3%. Ethena USDe came in a bit higher at 0.5%. Half a percent isn't huge, but it proves synthetic, yield-generating tokens don't react like plain old collateralized coins when markets move.

Drawdowns and Arbitrage Recovery Speeds

How long a peg stays down matters far more than a quick price tick. Dragged-out discounts trigger real liquidation risks for anyone using stablecoins as collateral in debt positions.

Dai took a 0.1% maximum drawdown starting May 28, 2026, then clawed back to par on May 30, 2026. That quick two-day window shows textbook arbitrage in action. Traders bought discounted Dai on decentralized venues to wipe out protocol debt or hit redemptions. Dai closed out the 90-day run at $0.999936, up from its starting price of $0.999707, after hitting its worst day on May 29, 2026, at -0%.

USDS matched Dai's 0.1% max drawdown. Its slump lasted from June 1, 2026, to June 3, 2026, taking its worst daily hit on June 2, 2026. Traders closed that gap inside 48 hours, setting up the token's best daily surge on June 4, 2026. USDS started the window at $0.999636 and reached $1 by August 5, 2026.

Ethena USDe dragged its feet. USDe recorded a 0.2% max drawdown that kicked off on May 15, 2026, and lasted until July 1, 2026. Its worst single day landed on May 16, 2026, at -0%. That recovery took a grinding 47 days. USDe runs on delta-hedged derivatives rather than standard Treasury backing or simple crypto collateral. When funding rates shift or unstaking queues slow down redemptions, secondary prices stay stuck at a discount. USDe eventually rallied, posting a 0.1% gain on July 10, 2026, and closing the 90 days at $0.999765 after starting at $0.999367.

Correlation Dynamics Across Stablecoin Architecture

If one coin slips, do the others fall over? Pairwise correlation data says no—price stress stays locked inside specific token designs.

The correlation between USDS and Dai sat at 0.13 over the 90 days. That weak relationship shows USDS price changes rarely copy Dai. Even in overlapping ecosystems, secondary market trading flows operate on their own island.

USDe showed similar independence. Correlation between USDS and USDE was 0.24, while DAI and USDE logged 0.23. Synthetic yield tokens move on perpetual futures funding rates and spot-futures basis spreads. Debt-backed coins move on vault liquidations. These distinct mechanics mean a slump in USDe won't drag Dai or USDS down with it.

Comparing Stablecoin Peg Performance

What This Means for You

For Long-Term Holders

If you hold stablecoins to park cash, low volatility is your main metric. USDS ($9.84 billion cap) and Dai ($4.59 billion cap) both held tight at 0.3% annualized volatility. A $1,000 stash in USDS or Dai barely drifted over 90 days. USDe was bumpier with 0.5% annualized volatility and a 47-day drawdown. Hold USDe, and you'll wait longer for secondary markets to match mint value when conditions get rough.

For Active Arbitrage Traders

Discounts create trading room. USDe offered a 0.2% max drawdown between May 15 and July 1, 2026. An arbitrageur running $1,000 in capital could buy USDe during its drawdown, hold through its 0.1% daily jump on July 10, 2026, and capture predictable spread convergence. Because correlations between USDE and Dai (0.23) or USDS (0.24) are low, you can trade discount spreads on USDe without making directional bets on other coins.

For On-Chain Gamblers and Traders

Using stablecoins as collateral? Keep an eye on drawdown length. A 0.1% drawdown on USDS or Dai lasted two to three days, keeping liquidation threats low on lending protocols. USDe stayed underwater for 47 days. If you post $100 or $1,000 of USDe as borrow collateral, pad your liquidation buffers for multi-week peg drifts.

How We Did the Math

We pulled daily close prices for USDS, Dai, and Ethena USDe over a 90-day window ending August 5, 2026, straight from our price history database. Annualized volatility comes from the standard deviation of daily log returns multiplied by the square root of 365 days. Pairwise asset relationships were calculated using standard Pearson correlation coefficients across the full 90-day sample.