What Does It Mean When a Stablecoin Depegs?
A depeg breaks a stablecoin's promise to hold steady value — some recover in days, others never do. Here's what happens, with real examples of both.
A stablecoin's entire purpose is holding a steady, predictable value — typically pegged to $1. A depeg is exactly what it sounds like: that peg breaks, and the stablecoin's actual market price drifts away from the value it's supposed to represent.
What "Pegged" Actually Means
A stablecoin pegged to the US dollar is designed so that one unit should always be redeemable for, or trade at, approximately $1 — maintained through some underlying mechanism, whether that's real dollar reserves held by the issuer, other crypto assets used as collateral, or an algorithmic process balancing supply against a related token.
What Happens During a Depeg
When confidence in the mechanism maintaining that peg weakens — for any reason — holders start selling, pushing the market price below (or, less commonly, above) the intended $1 value. Once this selling pressure begins, it can accelerate quickly, since a stablecoin trading below its peg gives every holder more reason to sell before the price drops further.
Why Depegs Range From Brief to Permanent
Some depegs are temporary — a stablecoin dips below its peg for hours or days due to a specific triggering event, then recovers as confidence returns and the underlying mechanism reasserts the peg. Others are permanent, where the mechanism maintaining the peg fails entirely and the stablecoin never meaningfully recovers.
A Real Example of a Temporary Depeg
USDC, a reserve-backed stablecoin, briefly traded around $0.87 in March 2023 after concerns emerged about a portion of its cash reserves being held at a bank that had just failed. The peg recovered within days once the situation around those specific reserves was resolved.
A Real Example of a Permanent Depeg
TerraUSD (UST), an algorithmic stablecoin with no direct dollar reserves backing it, lost its peg in May 2022 and never recovered — it fell to a small fraction of a cent as the mechanism meant to maintain its value collapsed under sustained selling pressure, taking its associated token down with it in the process.
Why the Underlying Mechanism Determines How a Depeg Plays Out
Whether a depeg is likely to be temporary or permanent depends heavily on what's actually backing the stablecoin — reserve-backed and algorithmic stablecoins carry meaningfully different risk profiles in exactly this scenario.
Why a Depeg Matters Even If You Don't Hold the Stablecoin Directly
Stablecoins are frequently used as the paired asset in liquidity pools, as collateral in lending protocols, and as a settlement currency across DeFi generally — a depeg in a widely used stablecoin can create cascading effects across protocols and pools that use it, even for people who never held the stablecoin itself directly.
What to Check Before Relying on Any Specific Stablecoin
What actually backs it, how transparently that backing is disclosed and verified, and whether it has any history of depegging previously — even briefly — as a signal of how resilient its mechanism has proven under stress.
Check what backs a specific stablecoin before relying on it heavily — the mechanism behind the peg determines how a depeg, if it happens, is likely to play out.