When a Stablecoin Loses Its Peg

A stablecoin’s dollar peg isn’t a guarantee written into the laws of finance. It’s a promise held together by whether the market believes a token can always be redeemed for a real dollar, immediately and without question. That belief can break in at least three structurally different ways: the reserves backing the coin can become genuinely inaccessible, the mechanism designed to maintain the peg can fail on its own terms, or a stablecoin can inherit another stablecoin’s problems simply by holding it as collateral. In March 2023, all three of the first and third patterns played out within days of each other, when USDC’s reserve exposure to a failed bank dragged down DAI, a completely different, decentralized stablecoin, purely because of what DAI held in its own reserves.

Understanding which type of de-peg is happening in real time, and why, is the difference between recognizing a temporary, fixable wobble and a permanent collapse.

Key Facts

TL;DR

• A stablecoin’s peg holds only as long as the market trusts that a token can be redeemed for a real dollar quickly and reliably. That trust, not any law of physics, is what actually keeps the price at $1.
• Reserve-risk de-pegs happen when the assets backing a stablecoin become temporarily inaccessible, as with USDC in March 2023, and typically recover once the underlying reserve issue is resolved.
• Algorithmic de-pegs happen when a stablecoin’s price-stability mechanism relies on market incentives rather than real reserves, and can spiral into permanent collapse once confidence breaks, as with Terra’s UST in May 2022.
• Collateral-contagion de-pegs happen when one stablecoin holds another as backing, meaning a healthy, well-designed stablecoin can still lose its peg purely because of what it holds in reserve, exactly what happened to DAI during the USDC crisis.
• Not every de-peg is equally dangerous. Distinguishing which type is occurring, and whether the underlying cause is fixable, is far more useful than reacting to the price move alone.

Why a Peg Needs Constant Defending

A stablecoin trades near $1 because of arbitrage: if it drifts below $1, traders can buy it cheaply and redeem it for a full dollar from the issuer, profiting from the gap and pushing the price back up. If it drifts above $1, the reverse happens. This mechanism only works as long as redemption itself is trusted and functional. The moment traders doubt that a token can actually be redeemed at par, whether because reserves seem at risk, the redemption process is paused, or the entire mechanism holding the peg together depends on unstable incentives, the arbitrage that normally defends the price stops working, and the peg can slip.

Type One: Reserve-Risk De-Pegs

This is the most straightforward category: the dollars or dollar-equivalent assets backing a stablecoin become genuinely difficult to access, even temporarily. USDC’s March 2023 episode is the clearest recent example. Circle disclosed that $3.3 billion of USDC’s reserves, about 8% of the total, was held at Silicon Valley Bank when regulators shut it down. USDC fell to roughly $0.87 within hours, even though the vast majority of its reserves were never actually at risk, because the market couldn’t be certain in real time how the SVB situation would resolve. Once the U.S. Treasury, FDIC, and Federal Reserve confirmed all SVB depositors would be made whole, USDC’s peg recovered within days. This type of de-peg is typically temporary, because the underlying assets still exist; the problem is a liquidity and confidence gap, not a genuine shortfall.

Type Two: Algorithmic De-Pegs

Some stablecoins maintain their peg not through direct reserves but through an algorithmic mechanism designed to balance supply and demand automatically. Terra’s UST worked this way, relying on a companion token, LUNA, that could be minted or burned to absorb price pressure. This design has no hard floor: if enough holders lose confidence at once and try to exit, the mechanism meant to restore the peg can instead accelerate its collapse, exactly what happened in May 2022, when large withdrawals from Anchor Protocol triggered a spiral that wiped out roughly $50 billion in value within days and left UST permanently broken, not just temporarily off its peg. This type of de-peg is fundamentally different in kind from a reserve-based wobble, because there’s no underlying asset to fall back on once confidence is gone.

Type Three: Collateral-Contagion De-Pegs

DAI’s experience during the same March 2023 crisis illustrates a third pattern that gets far less attention than the other two. DAI is a decentralized, crypto-collateralized stablecoin issued by MakerDAO, backed by a mix of assets including Ethereum, real-world assets, and, at the time, a substantial amount of USDC itself. When USDC fell to $0.87-0.88, DAI followed it down to a nearly identical low, not because of any flaw in DAI’s own design or governance, but purely because a large share of what backed DAI was itself a de-pegging asset. MakerDAO held approximately $3.1 billion in USDC as collateral at the time, and DAI’s price simply reflected the reduced value of that collateral.

This case matters because it shows peg risk can travel between stablecoins that have nothing else in common. DAI is decentralized and governed by a DAO; USDC is issued by a centralized company. DAI’s de-peg had nothing to do with its own governance or reserve practices and everything to do with a collateral choice made before the crisis. In direct response, MakerDAO’s community moved quickly to reduce this exposure, cutting DAI’s reliance on USDC from 51% at the start of 2023 to under 10% by mid-year, shifting instead toward U.S. Treasury bonds and other diversified collateral.

Comparison: Three Ways a Peg Breaks

What Happens to Holders During Each Type

During a reserve-risk or collateral-contagion de-peg, the outcome for most holders depends heavily on timing. Some holders who panicked and sold USDC or DAI near the bottom in March 2023 locked in real losses within days of a full recovery. Others benefited unexpectedly: reporting at the time noted that borrowers who owed debt denominated in USDC or DAI could repay those loans more cheaply while the tokens traded below a dollar, an unusual silver lining tied directly to the temporary nature of that de-peg. During an algorithmic collapse like UST’s, there was no comparable recovery window, and holders who didn’t exit in the earliest hours of the spiral generally lost the overwhelming majority of their position’s value permanently.

Practical Guidance

• Before assuming a de-pegging stablecoin will recover, identify which type of de-peg is occurring: check whether the issuer has disclosed a specific, resolvable reserve issue, whether the mechanism relies on an algorithmic design with no hard reserve backing, or whether the coin holds another stablecoin as collateral.
• Understand that a temporary reserve-risk de-peg, like USDC’s, historically resolved once the underlying issue was addressed, while an algorithmic de-peg, like UST’s, offered no equivalent recovery mechanism once confidence broke.
• Check what any stablecoin you hold, including decentralized ones like DAI, actually uses as collateral, since that composition can transmit another asset’s problems into a token that did nothing wrong itself.
• Avoid making an immediate panic decision based on price movement alone during the first hours of a de-peg; the type of de-peg matters more than the initial percentage drop.
• Recognize that no stablecoin, regardless of design, backing, or decentralization, is entirely immune to peg risk, since even fully collateralized coins depend on the accessibility and quality of whatever backs them.

What Happens Next

Expect stablecoin issuers to keep diversifying reserve composition following the lessons of March 2023, both to reduce single-bank exposure directly, as Circle has done since, and to reduce collateral-contagion risk indirectly, as MakerDAO’s shift away from USDC demonstrates. Expect continued scrutiny of algorithmic stablecoin designs specifically, given UST’s collapse remains the clearest case of a de-peg with no real floor beneath it. As stablecoin regulation matures under frameworks like the GENIUS Act, expect more standardized reserve disclosure requirements aimed at reducing the reserve-risk category of de-peg, though collateral-contagion risk between different stablecoins remains a structural feature of how decentralized finance is built, not something a single issuer’s disclosure practices alone can fully resolve.

FAQs

Does a stablecoin losing its peg always mean it’s going to zero?

No. Reserve-risk de-pegs, like USDC’s in March 2023, and collateral-contagion de-pegs, like DAI’s during the same event, have historically recovered once the underlying issue was resolved. Algorithmic de-pegs, like UST’s, have no equivalent guarantee.

How did DAI lose its peg in 2023 if it wasn’t directly exposed to Silicon Valley Bank?

DAI held a substantial amount of USDC as collateral at the time, so when USDC’s price fell, the value backing DAI fell with it, dragging DAI’s own price down even though DAI’s issuer, MakerDAO, had no direct exposure to the failed bank.

What’s the difference between an algorithmic stablecoin and a reserve-backed one?

A reserve-backed stablecoin is supposed to hold real dollar-equivalent assets for every token in circulation. An algorithmic stablecoin instead relies on a mechanism, often involving a companion token, to balance supply and demand, with no direct reserve behind each token.

Can a fully collateralized, decentralized stablecoin still be at risk during another stablecoin’s crisis?

Yes. DAI’s March 2023 de-peg demonstrates this directly: it was fully collateralized and decentralized, but because part of that collateral was USDC, it inherited USDC’s de-peg risk almost exactly.

Sources

• CoinDesk, “DAI Depegs as Stablecoin Rout Plagues Crypto”
• CoinSpectator, “Makerdao Issues Emergency Proposal to Address $3.1B in USDC Collateral After Stablecoin Depegging Incident”
• The Defiant, “DAI’s Reliance On USDC Drops Below 10% As MakerDAO Expands Bond Holdings”
• National Bureau of Economic Research, “Anatomy of a Run: The Terra Luna Crash”

This article is for educational purposes and does not constitute financial or legal advice. Stablecoins carry risk of temporary or permanent de-pegging depending on their reserve structure, mechanism design, and collateral composition. If you are making decisions about holding significant stablecoin balances, consider consulting a licensed financial advisor.