What is a stablecoin depeg, and what causes one?

A stablecoin makes one promise: that one coin is worth a dollar, whatever the market is doing. Most days it keeps that promise so quietly you forget it is a promise. Then the screen reads $0.94, or $0.80, and the asset you treated as cash moves like everything else. That slip has a name: a depeg.

What is a stablecoin depeg?

A stablecoin depeg is when a coin designed to hold a fixed value near $1 slips away from that value on the open market. The coin still claims to be worth a dollar, but buyers and sellers disagree for a while: they trade it at 97 cents, or 90, or less. A gap of a fraction of a cent that closes within minutes is ordinary trading friction. A gap that runs wide or persists is a repricing: the market is discounting the odds that every coin can be redeemed at par. New to the idea? What a stablecoin actually is (opens in a new tab) covers the basics.

Why does a peg hold in the first place?

A peg holds for two reasons: holders believe they can always swap the coin back for its value, and traders profit from closing any gap. Most large stablecoins are meant to be backed one-for-one by reserves, cash and short-dated government debt held so each coin can be redeemed for a real dollar. When the coin trades below $1, a trader buys it cheaply and redeems it for a full dollar, and that buying pushes the price back up. The peg is not magic; it is arbitrage plus a credible promise of redemption.

What makes a stablecoin lose its peg?

Depegs come down to three causes that often arrive together. The first is doubt about the reserves: if holders suspect the assets are not there, or not worth a full dollar, they rush to redeem, and the promise that holds the peg becomes the thing under test. The second is a redemption that jams: when holders cannot swap coins for dollars fast enough, through a frozen bank or a paused withdrawal, the arbitrage that repairs the peg stops. The third is thin liquidity: over a quiet weekend or in a panic, too few buyers may absorb the selling, so a modest wave of redemptions moves the price far.

The two depegs everyone points to

Two events shaped how people think about depegs, and they broke in opposite ways. In May 2022, TerraUSD (UST) fell from its dollar peg and never returned. UST was algorithmic: rather than cash reserves, it held its value through a mint-and-burn link with a brother token, LUNA. Once UST slipped below $1, the mechanism meant to restore the peg minted vast amounts of LUNA, which crushed LUNA's price and destroyed the backing the coin relied on. Around $40 billion evaporated across the two tokens within days, as widely reported.

USD Coin (USDC) took a different path. In March 2023, USDC briefly traded near $0.87 after its issuer disclosed that about $3.3 billion of its reserves sat at Silicon Valley Bank as that lender failed. This was doubt over where the reserves were, not a flaw in the design. Once US regulators guaranteed the bank's depositors, the doubt lifted and the peg recovered within days. The contrast is the lesson: real, redeemable backing can absorb a shock and pull the coin back, while a peg leaning on its own token in a falling market can spiral, since the fix feeds the fall.

Does a depeg always mean the coin is finished?

No. Most depegs are brief wobbles that resolve within hours as arbitrage does its work, and a reserve-backed coin that redeems on demand has a strong pull back towards $1. What turns a wobble into a collapse is the loss of that pull: reserves that cannot be reached, or a design that feeds the fall. So the question is not how far the price slipped but why, and whether the mechanism that should restore it still works.

How can you watch for peg stress?

You watch the same signals the market watches: news about reserves, redemptions and the issuer's banking, and the price drifting from $1. Northtape issues no stablecoin and holds none of your money. What it does is sort incoming news through the Risk Radar's four lenses. One is built for stablecoins, and the counterparty lens screens for the vocabulary these events speak in: reserves, proof-of-reserves, redemptions, withdrawals, halts. A story about an issuer freezing redemptions or losing its bank tends to surface there first. Where an AI summary describes such a story, it quotes the source word for word and links back, so you can check it. For the Singapore rules, see MAS' stablecoin framework (opens in a new tab).

FAQs

What is a stablecoin depeg in simple terms? It is when a coin meant to be worth $1 trades away from that value, at 95 cents or 80 cents rather than a dollar. A small gap is normal; a wide one signals the market doubts the peg.

Do all stablecoins depeg for the same reason? No. Reserve-backed coins usually slip when holders doubt the assets are there or cannot redeem fast enough, while algorithmic coins can slip because the peg mechanism fails.

Does a depeg always mean I lose money? Not necessarily. Many depegs are short and recover as arbitrage closes the gap, though a coin that cannot restore its peg may never return to $1. The outcome turns on whether real, redeemable backing sits behind it.

Can Northtape tell me a stablecoin is about to depeg? No. Northtape does not predict depegs or price moves. It surfaces news about reserves, redemptions and issuer stress, and cites each source, so you can read the signals yourself.

None of this is investment advice. A depeg is a market event with many causes, and the examples here describe past cases rather than forecast the next one. If you hold a stablecoin, the risk is specific to how that coin is backed and how it can be redeemed: understand those two things before you treat any coin as a settled dollar.