Crypto Decoded

Stablecoin Depeg Explained: Why The Peg Can Break

A plain English guide to stablecoin depegs, why a token can trade below its target, and how reserves, liquidity and redemptions shape the risk.

By Oliver Crane · June 20, 2026

A stablecoin sounds simple: one token is meant to stay close to one pound, one dollar or another reference asset. A depeg is what happens when that promise stops holding in the market, and the gap can tell you a lot about trust, reserves and how quickly people want their money back.

Reviewed by Sarah Okafor, Editor · June 20, 2026, 11:37 pm BST

In this article

The Short Version

A stablecoin depeg means the token trades away from the value it is supposed to track.
The cause is usually a mix of reserve doubt, weak liquidity, heavy selling or broken redemption mechanics.
Good reserves matter, but the speed and certainty of redemption matter too.
A brief wobble is different from a lasting collapse, so the context matters.
For ordinary users, the useful question is not whether the label says stablecoin, but how the peg is actually defended.

A Depeg Is A Confidence Problem

A stablecoin is built around a target price. A dollar stablecoin aims to trade close to one dollar. A sterling stablecoin aims to trade close to one pound. The word stablecoin can make that sound automatic, but it is not magic. The peg holds because traders, users and redemption channels keep treating the token as worth the target amount.

If you need the basic idea first, our guide to what a stablecoin is explains the main types. A depeg is the next layer. It is the moment when the market price says: people are no longer completely sure the token can be converted, sold or used at the advertised value.

That loss of confidence can be small and temporary. A token might trade at 99.7 cents for a short period during heavy market stress, then move back towards one dollar. It can also be serious. If people believe the reserves are weak, the issuer cannot process redemptions, or the design depends on another falling token, the gap can widen quickly.

The Peg Depends On Two Prices

Most people look at the market price first. If a stablecoin is shown at 96 cents on an exchange, it looks as if the stablecoin itself is worth 96 cents. That may be true for someone selling at that moment, but it is only one side of the story.

The other side is the redemption price. Some stablecoins are meant to be redeemable with the issuer for the target currency, often only by approved customers or above certain minimum sizes. If a professional trader can buy the token for 99 cents and redeem it for one dollar, that trade helps pull the price back towards the peg. This is one of the basic forces that can keep a fiat backed stablecoin stable.

But that force only works if the redemption route is open, trusted and large enough. If redemptions are paused, slow, limited to a small group, or surrounded by doubt, the market price can drift away. A stablecoin can therefore depeg even when the published reserve story looks reassuring, because the market also cares about access, timing and trust.

Reserves Matter, But So Does Liquidity

Stablecoin reserves are the assets that are supposed to back the tokens. For a fiat backed stablecoin, those reserves might include cash, bank deposits, Treasury bills or similar assets. The stronger the reserves, the easier it should be to meet redemptions without forcing losses.

Reserve reports are useful, but they are not the whole answer. Our explainer on proof of reserves makes the same point in a different context: evidence of assets is helpful only if you also understand liabilities, controls and what can happen under stress. With stablecoins, the question is not just what the issuer says it holds. It is whether those assets can be turned into cash quickly enough when many holders want out at once.

This is why regulators focus so much on redemption rights, stabilisation mechanisms and prudential requirements. The Financial Stability Board’s global stablecoin recommendations say that arrangements should give users clear claims and support timely redemption. The FCA also warns UK consumers that crypto remains high risk and that protections such as the Financial Services Compensation Scheme are unlikely to cover crypto related losses.

Redemptions Can Turn Pressure Into A Rush

A depeg often starts with a question. Are the reserves really there? Is a banking partner in trouble? Can the issuer process withdrawals? Has a linked asset fallen too far? Once enough people ask that question at the same time, the problem becomes circular.

Early sellers push the market price down. The lower price makes other holders nervous. Nervous holders try to redeem or sell. More selling creates a bigger discount. In normal markets, arbitrage can close the gap. In stressed markets, the discount itself becomes the warning signal that pushes more people towards the exit.

This is why a stablecoin can be fragile even if it looks boring on ordinary days. Payment users may treat it like cash, traders may use it as a parking place between crypto trades, and decentralised finance protocols may use it as collateral. When the peg slips, all those uses can become channels for stress. If you want the real world use case side, the guide to how stablecoins are used in the real world shows why the stakes are larger than a price chart.

Not Every Depeg Means The Same Thing

A tiny move away from the peg is not the same as a collapse. Prices on crypto exchanges can move because of spreads, thin liquidity, temporary congestion or a short burst of selling. A token trading at 99.9 cents for a few minutes is not the same situation as a token losing its peg for days while redemptions fail or confidence disappears.

The design matters too. A fiat backed stablecoin depends heavily on reserve quality, custody and redemption. A crypto collateralised stablecoin depends on overcollateralisation, price feeds and liquidation rules. An algorithmic design may depend on incentives that work in calm markets but break when everyone wants to leave together. The FCA’s consumer material points to TerraUSD as an example of a project that detached from its intended dollar value and collapsed.

That does not mean every stablecoin is the same risk. It means the word stablecoin is a starting label, not a guarantee. The details decide how much pressure the peg can survive.

A Worked Example

Imagine a fictional stablecoin called ClearDollar. It is meant to trade at one dollar. For months, it sits close to that level because users believe each token is backed by safe, liquid assets and because large traders can redeem it with the issuer.

Then a rumour spreads that part of the reserve is stuck at a bank. Nobody knows whether the rumour is true. On one exchange, sellers accept 98 cents because they want out quickly. Other traders see the price fall and start selling too. A few decentralised finance pools become imbalanced because more people are swapping ClearDollar for other stablecoins than the other way round.

The price touches 96 cents. That does not automatically mean every ClearDollar is backed by only 96 cents of assets. It means the market is applying a discount for uncertainty, speed and access. If the issuer can show the reserves are safe and redemptions keep working, buyers may step in and the peg may recover. If the issuer cannot do that, the discount may deepen because the market starts treating the peg as a promise it no longer trusts.

What This Means For You

If you hold or use stablecoins, the key lesson is simple: stable is not the same as risk free. A stablecoin can be useful for moving value around crypto markets, but it still depends on an issuer, a reserve structure, a redemption route, market liquidity and confidence.

Before treating a stablecoin as a cash equivalent, ask what backs it, who controls the reserves, whether ordinary users can redeem directly, what happens if redemptions are paused, and whether the token is accepted only inside crypto markets or also in regulated payment settings. For a specific example of issuer questions, our guide to USDT and Tether explains why reserve transparency has mattered so much in stablecoin debates.

The practical point is not to predict the next depeg. It is to understand the failure points before stress arrives. If the only reason you trust a token is that its name includes the word stable, you do not yet understand the risk.

In Plain English

A stablecoin depeg happens when the market stops pricing the token at the value it is supposed to follow.

That can happen because people doubt the reserves, cannot redeem quickly, lose trust in the issuer, or rush to sell at the same time. The peg is a mechanism, not a law of nature.

A good stablecoin design makes redemption boring. A weak one turns a small question into a queue for the exit.