Stablecoin Depegs Explained: Why They Happen and How to Stay Protected (2026)

A stablecoin depegs when its price moves meaningfully away from its target value, almost always $1, and does not quickly return. Most stablecoins are soft-pegged, so a few tenths of a cent of drift is normal.

In November 2025, a stablecoin called xUSD fell roughly 77% in a single day after its issuer disclosed a $93 million loss tied to one external fund manager. It had traded at a dollar until the mechanism behind it failed.

The Stablecoin market is now enormous in size. More than $322 billion sits in stablecoins as of May 2026, a figure that exceeds the foreign exchange reserves of 95 countries, with the top coins holding close to 90% of supply per DefiLlama.

A Stablecoin that falls to $0.90 and stays there has lost the mechanism meant to pull it back. This guide will help you analyse the risk behind holding different kinds of strablecoins and how to choose the right one for you.

What is a stablecoin depeg?

A stablecoin depeg is a sustained, meaningful deviation of a coin’s market price from its target, usually $1.

The peg is the target itself: the value a stablecoin is engineered to hold, maintained through backing assets and trading mechanisms that keep the market price near par.

The distinction that trips people up is drift versus depeg. A coin trading at $0.999 or $1.001 during normal activity is working as intended, and arbitrage closes that gap in minutes.

A depeg is different in degree and duration: a large move, like USDC’s drop toward $0.87 in 2023, or a deep one that persists for days, which signals the backing or the confidence behind the coin has broken.

How do stablecoins hold their peg?

Stablecoins hold their peg through a combination of real backing and active trading that corrects the price whenever it drifts.

Four mechanisms do the work, and the more transparent each one is, the more pressure the peg absorbs before it breaks.

• Reserves and backing: each token is backed by assets such as cash, short-term Treasuries, crypto, or real-world assets, so it has genuine value behind it. Under the GENIUS Act signed in July 2025, US payment stablecoin issuers must hold 100% reserves in liquid assets and disclose their composition monthly.
• Redemption and arbitrage: when the price slips below $1, traders buy the discount and redeem at par for a full dollar, and when it rises above, they mint and sell. That buying and selling pulls the price back.
• Overcollateralization: the system holds more collateral than the value of tokens issued, creating a buffer that absorbs a fall in collateral value before holders are touched.
• Peg Stability Module: a contract that swaps the stablecoin for another dollar asset at a fixed rate, defending the price directly.

Why do stablecoins depeg?

Stablecoins depeg when one or more of those mechanisms fails, and the failures tend to compound. The most common trigger is a loss of confidence that turns into a bank run, where holders rush to exit faster than reserves or liquidity can absorb.

The other causes are variations on the same theme. Reserves can be too thin or too illiquid to honor redemptions. The backing can sit at a vulnerable counterparty, like a bank that fails over a weekend. Collateral can crash faster than the system liquidates it.

Redemption can be paused, removing the arbitrage that holds the price. And purely algorithmic designs, which hold little or no real collateral, can unwind the moment belief in them slips.

A September 2023 S&P study of stablecoin valuation and depegging traces most events back to exactly these structural weaknesses.

Real stablecoin depegs: three cases, three lessons

The clearest way to understand a stablecoin depeg is to look at three real events, because each broke for a different reason.

TerraUSD shows what happens with no real backing, USDC shows a well-backed coin surviving a scare, and xUSD shows the hidden cost of concentration.

TerraUSD (UST) collapsed in May 2022. It was algorithmic, propped up by a sister token and incentives, with no hard collateral to fall back on, and a borrowing protocol had drawn in capital with yields near 20%.

When confidence cracked, the design entered a death spiral: UST and its paired token LUNA fell to near zero within days, and an MIT Sloan analysis described it as a run on a structurally unsustainable system with no sign of targeted manipulation. The lesson: a coin backed mostly by belief is fragile by design.

xUSD, a yield-bearing synthetic, lost its peg in November 2025. Its issuer disclosed a loss tied to a single off-chain strategy, paused withdrawals, and the token fell about 77% as holders found they could not exit at par. It had issued far more tokens than it held in real assets. The lesson: single-strategy, opaque designs carry peg risk you cannot see during normal conditions.

The USDC depeg (2023)

USDC briefly broke its peg in March 2023, falling to around $0.87 before recovering within days. The cause sat outside the token: Circle had $3.3 billion of USDC reserves stuck at the failing Silicon Valley Bank, roughly 8% of its backing. When that news broke on a weekend, the price slid as holders worried the reserves were trapped.

It repegged because the backing was real. After regulators backstopped SVB depositors, USDC recovered and fully returned to $1 once Circle resumed redemptions.

The lesson is twofold: reserve location and counterparty exposure matter even for a fully backed coin, and a coin with sound, transparent reserves can survive a scare.

For a deeper treatment of these risk categories, the companion guide on whether stablecoins are safe covers them in full.

How peg stability is designed to work

Strong peg design layers the mechanisms above so no single failure is fatal. USDS, the stablecoin and entry point to Sky Protocol, is a useful worked example: it shows the layers in one place and states its limits honestly.

It is soft-pegged, designed to stay close to $1, with no strict 1:1 guarantee and the possibility of minor fluctuation.

What holds that peg is concrete. USDS is overcollateralized, backed by a surplus of diversified collateral that includes crypto, tokenized US Treasuries, and reserves held in its Peg Stability Module, which converts USDC to USDS at 1:1 with no fees or slippage.

It is non-custodial, and the collateral and governance are verifiable onchain in real time. Holders who want yield convert USDS into sUSDS to earn the Sky Savings Rate, a governance-set, variable rate funded by Sky Protocol revenue through the Sky Agent Network.

Honesty about the downside is what makes the rest credible. USDS carries smart-contract risk, the soft peg can drift, and in August 2025 S&P assigned Sky Protocol a B- rating, the first full credit rating for a DeFi protocol. B- is speculative-grade, and S&P flagged real concerns alongside it, including depositor concentration, centralized governance, and a thin capital buffer.

That is a transparency signal, not a safety badge, and Sky documents the same risks in its own user-risk pages. A higher-risk option, stUSDS, sits above sUSDS on the risk curve and can take a haircut; it is for expert users, never the default.

How to stay protected from a depeg

You cannot eliminate depeg risk, but you can avoid the designs that cause the worst losses.

Work through these steps before you trust any stablecoin with meaningful money:

1. Read the backing before the rate. Find out what actually backs the coin and whether the reserves are liquid and diversified. If you cannot find out, treat that as your answer.
2. Be wary of purely algorithmic or unbacked designs. UST is the standing example of how fast a coin with no hard collateral unwinds under stress.
3. Check where the reserves sit and whether you can verify them. Counterparty location is what broke USDC’s peg for 48 hours; coins that publish live, onchain collateral let you check for yourself.
4. Question an unusually high yield. A rate well above the rest is a question about where it comes from and what has to keep working, not a free gift. xUSD’s single strategy is the cautionary case.
5. Self-custody where you reasonably can, which removes a layer of counterparty risk that fiat-backed issuers carry.
6. Spread across more than one coin or strategy, because concentration is what turned several depegs into serious personal losses.

The honest comparison is between models, and the ticker hides the difference. Fiat-backed coins like USDC are simple and deeply liquid, which is a real strength; the trade-off is that you trust an issuer’s reserves and banking partners, which is precisely what wobbled in 2023.

An overcollateralized, onchain-verifiable, governance-set design asks you to trust code and visible collateral. Neither removes risk, and this companion explainer on how stablecoins work walks through the mint, redeem, and arbitrage loop in more depth.

If I had to leave you with one rule about a stablecoin depeg, it is this: the headline price tells you almost nothing, so judge a coin by what backs it, whether you can verify that backing, and whether redemption still works when everyone heads for the exit at once.

The coins worth holding through a bad week are the ones that let you check all three before you ever need to.

Put your stablecoins to work at sky.money

Frequently asked questions

What is a stablecoin depeg? A stablecoin depeg is when a stablecoin moves meaningfully away from its target value, usually $1, and does not quickly return. Small drift during normal trading is routine; a large or sustained move signals the backing, redemption, or confidence behind the coin has failed.

Why do stablecoins depeg? Stablecoins depeg from a loss of confidence and bank-run dynamics, thin or illiquid reserves, collateral crashing faster than the system can respond, paused or broken redemption, or purely algorithmic designs with no real backing. Several of these often compound at once.

Has USDC ever depegged? Yes. USDC briefly fell to around $0.87 in March 2023 after Circle disclosed that $3.3 billion of its reserves were stuck at the failing Silicon Valley Bank. It returned to $1 within days once regulators backstopped the bank and redemptions resumed, because the reserves were ultimately sound.

What is overcollateralization? Overcollateralization means holding more collateral than the value of the tokens issued. The surplus acts as a buffer that absorbs a drop in collateral value before holders are affected, which is why overcollateralized coins have more room to hold their peg under stress.

How does USDS stay close to its peg? USDS is soft-pegged, overcollateralized with diversified collateral, and supported by Peg Stability Modules that convert USDC at 1:1. It is non-custodial and verifiable onchain. It can still fluctuate slightly and carries no strict 1:1 guarantee.

How can I protect myself from a depeg? Prefer overcollateralized, diversified, transparent coins with sound redemption, verify where the reserves sit, self-custody where you can, question unusually high yields, and spread across more than one coin. Avoid opaque, single-strategy, or unbacked designs.

Can a stablecoin recover from a depeg? A well-backed coin can, as USDC did in 2023 once its reserves were confirmed sound. Purely algorithmic or thinly backed coins often do not, because once confidence breaks there is no collateral to restore the peg, which is what happened to TerraUSD.

Stablecoin Depegs Explained: Why They Happen and How to Stay Protected (2026) was originally published in Coinmonks on Medium, where people are continuing the conversation by highlighting and responding to this story.