Stablecoin Depeg Risk: Why a Stablecoin Loses Its Dollar Peg

On a Saturday in March 2023, people who thought they were holding dollars watched their USDC trade at 87 cents. Nothing had changed about the code, the branding, or the promise of a 1:1 peg. What changed was a single fact — that some of the cash behind the coin was stuck at a bank that had just failed. That gap between the promise and the plumbing is exactly what stablecoin depeg risk is about. A stablecoin is supposed to sit quietly at one dollar while the rest of crypto swings wildly. When it slips, holders learn the hard way that "stable" is a design goal, not a law of physics.

We already covered what these coins are and how the big ones work in our guide to stablecoins explained: USDT and USDC. This article does the next thing: it explains why a peg breaks, why some breaks heal in days while others are fatal, and how to judge a coin before you park real money in it.

What a stablecoin depeg actually is

A peg is a promise: one token should always be worth one dollar. A depeg is when the market price drifts meaningfully away from that dollar and stays there long enough to matter — usually below it, sometimes above. A move from $1.000 to $0.998 is noise; every stablecoin wobbles by fractions of a cent all day. A move to $0.95, $0.87, or $0.10 is a depeg, and the size and duration tell you how serious the trouble is.

The peg does not hold itself. It holds because of arbitrage. If a coin backed by real reserves trades at $0.98, a trader can buy it cheap on an exchange and redeem it with the issuer for a full dollar, pocketing two cents. That buying pressure pushes the price back toward $1. The same works in reverse above the peg. So a peg is really a bet that redemption will always be there, fast and at par, for anyone who wants it.

That single sentence explains almost every depeg you will ever read about. When holders start to doubt that they can get a real dollar back — because the reserves look shaky, because redemption is paused, or because there was never any real dollar to begin with — the arbitrage that anchors the price weakens, and the coin drifts. Understanding this arbitrage is the foundation for reading crypto risk, and it is exactly the kind of thing a structured cryptocurrency course builds properly instead of leaving you to learn it during a crash.

Why stablecoins lose their peg: four failure modes

Pegs do not break at random. Almost every depeg traces back to one of four causes, and knowing them lets you see trouble before the price does.

1. Reserve doubt

The coin claims to hold real assets, but the market suddenly questions whether those assets are safe or even there. This is what hit USDC in March 2023: the issuer, Circle, revealed it had $3.3 billion of reserves parked at Silicon Valley Bank right as that bank collapsed. Holders could not verify their dollars were safe over a weekend, so they sold first and asked later.

2. Redemption friction

The arbitrage only works if people can actually redeem. When redemptions are paused, gated behind large minimums, or limited to a handful of institutional partners, ordinary holders cannot enforce the peg. The price on exchanges is then free to drift below the theoretical value of the reserves.

3. Algorithmic reflexivity

Some coins hold their peg not with cash but with a second, volatile token and a mint-and-burn rule. That works in calm markets and fails violently in a panic, because the "backing" falls at the exact moment it is needed most. This is the death spiral that destroyed TerraUSD.

4. Liquidity and concentration

If most of a coin's trading sits in one pool or one exchange, a single large seller can crack the price, and thin liquidity turns a small wobble into a headline. Concentration of reserves at one bank does the same thing on the asset side.

Notice that three of the four are really about the same question: what is behind the coin, and can you get it back? That is why reserve composition is the first thing professionals check. A well-run fiat-backed coin like USDC now keeps roughly four-fifths of its reserves in short-dated US Treasuries and overnight repo through a BlackRock-managed government money-market fund, with the rest as cash at large banks.

A holder's depeg-safety checklist

You cannot audit a stablecoin issuer yourself, but you can ask six questions that separate a robust coin from a fragile one. Run this checklist before you hold a large balance or use a coin as your parking spot between trades.

1. What actually backs it? Cash plus short-dated government bonds is the gold standard. Commercial paper, loans, other crypto, or a sister token are progressively riskier. "Backed by an algorithm" means backed by confidence.
2. How good is the proof? Monthly attestations by a named accounting firm beat quarterly ones, which beat a vague dashboard, which beats nothing. USDC's issuer publishes monthly third-party attestations; weaker coins publish far less.
3. Can you redeem at par? Check whether redemption is open to normal users or only to a few big partners. Reliable redemption for everyone is what actually enforces the peg.
4. Where is the money kept? Reserves spread across several strong institutions survive one bank failing. Everything at a single counterparty is a single point of collapse, as March 2023 showed.
5. How deep is the liquidity? A coin that trades across many venues with tight spreads absorbs selling. One that lives in a single pool can snap.
6. How did it behave under stress? A coin that has held or quickly recovered through past scares has earned some trust. A coin with no track record has not been tested.

If you cannot answer the first two questions clearly, that is your answer. Opacity is itself a risk signal. The habit of demanding evidence before trust is the single most valuable thing a serious crypto learner develops.

Two depegs, two endings: UST versus USDC

The clearest way to understand depeg risk is to hold two famous breaks side by side. Both dropped well below a dollar. Only one came back.

TerraUSD (UST), May 2022 — the terminal case. UST was an algorithmic stablecoin. It had no real cash reserves; instead, a holder could always burn one UST to mint one dollar's worth of its sister token, LUNA. When large holders pulled money out and the peg slipped, that rule forced the system to mint enormous amounts of LUNA, crushing LUNA's price from over $80 to a fraction of a cent in days. The more UST holders fled, the more LUNA was printed, the worse it got — a self-feeding collapse. UST fell more than 95% and never recovered, wiping out roughly $45 billion of value across the Terra ecosystem in about three days.

USDC, March 2023 — the scare that healed. USDC is fiat-backed. When Circle disclosed $3.3 billion of reserves trapped at Silicon Valley Bank, USDC fell below $0.87 over the weekend. But the assets were real and mostly elsewhere; once US regulators guaranteed the SVB deposits, the missing dollars were recovered and USDC climbed back to $1 within about three days. The break was frightening, but because there were genuine assets to redeem, arbitrage pulled the price home.

The lesson is not "USDC good, UST bad." It is that the recovery depends on whether real, redeemable assets exist. A fiat-backed coin's depeg is usually a liquidity scare; an algorithmic coin's depeg can be the end. If you also self-custody, the same discipline extends to where you store coins — our guide to cold wallet versus hot wallet storage covers that side.

The risks even a "good" stablecoin still carries

Choosing a well-backed coin lowers depeg risk; it does not remove every risk. A few realities are worth keeping in front of you.

• Nothing here is risk-free. Even the strongest issuers face bank failures, regulatory shocks, and operational mistakes. "Stable" describes the target, not a guarantee.
• Counterparty and custody risk. If you hold your stablecoin on an exchange, you are also trusting that exchange, not just the issuer.
• Regulatory risk in India. Rules on crypto keep evolving; what an exchange can offer can change. Our explainer on crypto regulation in India tracks the current position.
• Tax does not care that it is "stable." In India, stablecoins are Virtual Digital Assets. Gains are taxed at a flat 30% and a 1% TDS applies on transfers, with no set-off of losses. Moving in and out of a stablecoin is a taxable event.

That tax point surprises people the most, because a coin that never moves in price feels like cash. It is not treated like cash. Before you use stablecoins to trade or save, read how the numbers actually work in our guide to crypto tax in India: 30% tax and 1% TDS. Getting this wrong at filing time is a far more common loss than a depeg.

What to do next

Depeg risk is not a reason to avoid stablecoins; it is a reason to choose them with your eyes open. The takeaway is simple: a stablecoin is a promise backed by something, and your job is to know what that something is and whether you can get it back. Prefer coins with transparent, high-quality reserves and frequent independent attestations. Be wary of anything that promises stability through cleverness rather than assets. Spread large balances rather than trusting one issuer or one exchange, and remember the Indian tax treatment before you move funds.

Most people learn these lessons during a crash, when it is expensive. The better path is to build the mental model first — reserves, redemption, liquidity, and regulation — so a scary headline reads as information, not panic. That is the difference between reacting to markets and understanding them, and it is what structured learning is for.

Frequently Asked Questions

What does it mean when a stablecoin depegs?

It means the coin's market price has drifted away from its target — usually one US dollar — by more than a trivial amount and stayed there. Tiny wobbles of a fraction of a cent are normal. A slide to $0.95, $0.87, or lower signals that holders doubt they can redeem the coin for a full dollar, so the arbitrage that normally anchors the price has weakened.

Can a stablecoin recover after losing its peg?

Often, yes — if it is backed by real, redeemable assets. USDC fell below $0.87 in March 2023 and returned to $1 within about three days once its trapped reserves were secured. Algorithmic coins are different: TerraUSD lost more than 95% in 2022 and never came back, because there were no real assets to redeem.

Which stablecoin is the safest to hold?

No stablecoin is completely safe, but coins backed mainly by cash and short-dated government bonds, with frequent independent attestations and open redemption, carry lower depeg risk than those backed by riskier assets or by an algorithm. Reserve quality, proof, and redemption access matter more than brand size.

Are stablecoins taxed in India?

Yes. Stablecoins are treated as Virtual Digital Assets, so gains are taxed at a flat 30% and a 1% TDS applies on transfers, with no set-off of losses against other income. A steady price does not make a stablecoin tax-free; selling or converting it is a taxable event you must report.

Why do algorithmic stablecoins fail so badly?

Because their "backing" is a second, volatile token instead of real reserves. In a panic, the mechanism that is meant to defend the peg mints more of that token, crushing its price and destroying the backing at the exact moment it is needed. This self-reinforcing "death spiral" is why algorithmic designs can go to near zero and stay there.

Disclaimer: This article is for educational purposes only and does not constitute investment advice. Markets carry risk — please do your own research or consult a qualified financial professional before investing. NIFM provides training and exam preparation; certification exams conducted by regulatory or professional bodies are administered by those bodies independently.