Stablecoins have become a cornerstone of the cryptocurrency market, offering the promise of price stability in an otherwise volatile environment. Designed to maintain a fixed value—usually pegged to the US dollar—stablecoins are widely used for trading, payments, and as a safe harbor during market turbulence. However, history has shown that stablecoins are not immune to price fluctuations. When stablecoins deviate significantly from their pegged value, a phenomenon known as “depegging,” both users and markets can be thrown into disarray. Understanding the causes behind these events and the mechanisms that restore or fail to restore the peg is critical for anyone navigating the crypto landscape.
Understanding Stablecoin Depegging
A stablecoin depeg occurs when the secondary-market price of a stablecoin diverges meaningfully from its intended reference value, typically $1.00. Under normal circumstances, arbitrage ensures price parity with the underlying asset by allowing traders to buy stablecoins at a discount and redeem them for $1 with the issuer, profiting from that spread. This arbitrage channel is the main stabilizing force. When it becomes inaccessible—due to redemption delays, excessive fees, or insufficient backing—the gap widens and the stablecoin can remain below its peg, sometimes for prolonged periods or even permanently.
The restoration of the peg depends entirely on whether the arbitrage channel reopens effectively. Historically, some stablecoins like USDC and DAI have managed to regain parity within days, while others, such as UST, have collapsed completely.
The Role of Arbitrage in Maintaining the Peg
Stablecoin architectures generally fall into three categories: fiat-backed, crypto-collateralized, and algorithmic. Regardless of the design, price stability fundamentally relies on the ability of arbitrageurs to exploit price discrepancies between the market price and the peg. Arbitrage typically resolves temporary price imbalances in minutes during normal market conditions. For instance, USDT may fluctuate between $0.997 and $1.003 during times of volatility but returns swiftly to equilibrium due to active arbitrage.
A true depeg, as opposed to a momentary market fluctuation, is defined by the duration and persistence of the deviation. If the redemption mechanism becomes slow, capped, expensive, or entirely unavailable while selling pressure in secondary markets continues unabated, traders lose the incentive or ability to exploit price differences. The depeg then persists until normal redemption becomes feasible again.
The situation is often compounded by market psychology. Uncertainty about the underlying reserves or redemption pathways can amplify panic selling, overwhelming even a sound arbitrage system.
Fiat-Backed Stablecoins: Redemption as the Release Valve
Most stablecoins, including USDT and USDC, are backed by fiat reserves held in bank accounts or equivalent assets. If the stablecoin price drops below $1, institutions and arbitrageurs can buy at a discount and redeem for $1 worth of underlying assets, thereby driving the price back up. Quick and open redemption is essential for this feedback loop to function.
USDT’s episode during May 2022 is instructive. Amidst the Terra/Luna contagion, USDT briefly traded as low as $0.95. In response, Tether processed over $10 billion in redemptions within two weeks. The price only returned to its peg after this massive outflow cleared, illustrating that the system worked, albeit under significant strain and delay.
USDC’s depeg in March 2023 revealed a different vulnerability. When Circle, the company behind USDC, disclosed that $3.3 billion of its reserves were held in Silicon Valley Bank (SVB)—which had just collapsed and entered receivership—confidence evaporated. USDC fell to around $0.87 on secondary markets. Only after US authorities guaranteed all SVB deposits did USDC recover, regaining its peg within three days. Here, the reliability and accessibility of reserves, not the redemption machinery itself, was the critical failure point.
Crypto-Collateralized Stablecoins: Debt Positions and Stability Modules
Crypto-backed stablecoins like DAI employ overcollateralization to buffer against the wild volatility of their underlying assets. Users lock up crypto in smart contracts to mint stablecoins, maintaining a collateral-to-debt ratio that cushions against falling asset values. MakerDAO’s DAI, for example, was built on the premise that cryptocurrencies can experience 25% daily and 300% monthly price swings, necessitating excess collateral.
A significant innovation in the DAI ecosystem is the Peg Stability Module (PSM), which allows users to swap DAI for a fixed amount of USDC at a 1:1 ratio. This linkage is designed to keep DAI closely pegged, but it comes with its own risks. During the USDC depeg, DAI traded down to $0.89 as fears from USDC’s SVB exposure spread through the PSM’s collateral pool. DAI’s recovery was contingent upon USDC’s own recovery, showing the interconnected risks between different stablecoins.
Other crypto-collateralized models, such as Liquity’s LUSD, implement minimum redemption floors and dynamic fees. With a redemption fee set at 0.5%, redemption only becomes profitable when the token trades below $0.995. This arrangement reduces the likelihood of constant redemption pressure but can also slow recovery when severe depegging events occur.
Algorithmic Stablecoins: Arbitrage Without Direct Backing
Algorithmic stablecoins, such as the now-defunct UST, presented a radically different approach: rather than being anchored by fiat or crypto reserves, these coins use smart contracts and secondary tokens to maintain their peg. In UST’s case, the protocol required users to burn network’s LUNA tokens to mint UST, and vice versa, creating a supply-demand mechanism intended to hold the peg.
However, the arbitrage machinery in algorithmic stablecoins is highly vulnerable to market panic and structural flaws. During UST’s collapse in May 2022, the protocol imposed limits on daily redemptions that caused redemption fees to soar to 60%, capping the price far below $1 and ultimately causing the mechanism to break down irreparably. Even after these limits were lifted, other issues—such as extreme LUNA volatility and broken price oracles—prevented recovery. The lack of tangible reserves meant there was no external “release valve,” leading to catastrophic failure and the destruction of tens of billions in market value.
This episode proved that relying purely on circular, internal collateral is extremely risky and may not provide enough confidence or capital to withstand a severe crisis.
Side-by-Side Comparison of Major Stablecoin Depegs
A historical review of major stablecoin depegs since 2022 highlights their differing root causes, depth, and recovery profiles:
| Stablecoin | Date | Lowest Price | Recovery Time | Root Cause |
|---|---|---|---|---|
| UST | May 2022 | ~$0.00 | Never recovered | Algorithmic failure |
| USDT | May 12, 2022 | ~$0.95 | About 2 weeks | Mass redemptions during Luna contagion |
| USDN (Neutrino) | April 2022 | ~$0.78 | Never fully recovered | Algorithmic design; Waves token collapse |
| USDC | March 10-13, 2023 | ~$0.87 | About 3 days | SVB reserve exposure |
| DAI | March 11, 2023 | ~$0.89 | About 3 days | USDC contagion via PSM |
| BUSD | Feb 2023 onward | ~$0.995 | Slow-bleed wind-down | Regulatory halt on minting |
BUSD presents a unique case. The New York Department of Financial Services ordered issuing firm Paxos to cease creation of new BUSD tokens in February 2023. While the reserves remained stable and redemptions stayed open, the main effect was on circulating supply, which plummeted from $16 billion to under $50 million by late 2024. Price impacts were limited, manifesting only as modest discounts of 0.3-0.5%, as holders gradually rotated to alternatives like USDT and USDC rather than being forced out by a collapse in price.
Common Misconceptions About Stablecoin Depegs
A frequent misunderstanding is to equate any depeg event with a loss of underlying reserves, using catastrophic algorithmic failures like UST as the archetype. However, as the case studies of USDT, USDC, and DAI illustrate, price typically recovers if redemption pathways remain functional and reserves intact. In these cases, the market discount simply reflects temporary uncertainty or illiquidity, not insolvency.
By contrast, UST’s demise stemmed from the failure of its arbitrage and redemption mechanisms, not merely a loss of confidence. Even when redemption limits were lifted, the system could not absorb the value destruction required to restore parity. This difference underscores the importance of robust, transparent redemption systems and sound collateral management for stablecoins.
Notably, newer entrants like Ethena’s USDe, which holds hedged positions in ETH and BTC instead of relying solely on internal tokens, have not experienced depegs through three market cycles as of early 2026. While this suggests a promising track record, no design can be declared immune to depegging without facing a major stress event.
What the Evidence Tells Us—and What It Does Not
Case data presented here is primarily drawn from historical price feeds and news coverage rather than direct exchange order book analysis. In some cases, sources disagree on exact market lows; for example, USDC’s SVB episode is variously reported as bottoming at $0.87 and “below $0.88” by different aggregators. Detailed studies of why arbitrage broke down at a transaction level are rare, with UST receiving the most scrutiny.
Illustrative volatility statistics—such as Bitcoin’s 25% daily or 300% monthly moves—are based on earlier market conditions, and may not reflect the present. More importantly, none of this historical analysis can guarantee whether or when a current stablecoin might depeg or how quickly it would recover. Those outcomes will always depend on a host of real-time factors: the size and composition of reserves, the resilience of redemption mechanisms, external counterparty exposure, and market sentiment at the time of shock.
Conclusion
Stablecoin depegging is a complex phenomenon shaped by both mechanical and psychological forces. The ability to redeem stablecoins for their backing asset—swiftly and reliably—is crucial in containing discounts and restoring the peg. Structural failures, whether rooted in illiquid reserves, algorithmic rigidity, or failed governance, can turn temporary dislocations into permanent collapses. The history of notable depegs since 2022 underscores that transparency, robust design, and effective arbitrage mechanisms are non-negotiable for any stablecoin aspiring to maintain long-term trust and utility in the digital economy.
