Understanding Stablecoin Depegs
Stablecoins operate on an economic promise rather than a hard rule coded into software, with issuers guaranteeing that every token can be redeemed for one real dollar. Market prices remain pinned near one dollar through the mechanism of arbitrage. When a stablecoin trades below a dollar, professional traders buy the discounted tokens and redeem them with the issuer for a full dollar, pushing the market price back up. Conversely, trading above a dollar leads traders to mint new tokens and sell them.
However, direct redemption often involves narrow pathways, such as high minimum thresholds or institutional account requirements. Retail holders, decentralized finance protocols, and offshore exchanges depend on a chain of arbitrageurs to keep buying discounted tokens during panics. Consequently, depegs can occur on exchange screens even when an issuer honors every valid redemption, relying initially on market confidence rather than reserves alone.
Four Depegs and Their Distinct Causes
Historical depegs have stemmed from a variety of distinct vulnerabilities:
- Confidence Problems: In October 2018, rumors regarding the solvency of Tether and Bitfinex sent USDT down to roughly $0.88 on some venues before reserves met redemptions and the peg healed within days.
- Banking Problems: In March 2023, Circle disclosed that $3.3 billion of its USDC reserves were held at the failed Silicon Valley Bank. USDC fell to $0.87 before U.S. regulators guaranteed deposits, dragging down decentralized finance markets including DAI, which slid to about $0.89.
- Counterparty Problems: In November 2025, Stream Finance’s yield-bearing stablecoin xUSD crashed from $1 to as low as $0.24 after an outside fund manager disclosed a $93 million loss, freezing $160 million in user deposits. Unlike dollar-backed coins, xUSD utilized leveraged strategies through outside managers to generate yield.
- Design Problems: The May 2022 collapse of terraUSD (UST) relied on an algorithmic mechanism tied to its sister token, LUNA, rather than traditional reserves. Large withdrawals caused a cascade that hyperinflated LUNA's supply, dropping UST below $0.10 within a week, evaporating roughly $40 billion across both tokens, and impacting broader market lenders and the FTX exchange.
Market Contraction and Concentration Risks
Regulatory shifts, such as new U.S. federal rules wiping out interest payments on digital dollars, have prompted yield-seeking capital to pull back. After peaking near $322.1 billion in mid-May, total stablecoin supply experienced a sharp contraction, shedding $14.56 billion by early August. During this stretch, USDT slipped to $183.2 billion, and USDC dropped to about $72.1 billion from a March peak near $80 billion.
Market concentration remains high, with USDT and USDC accounting for roughly 83% of the broader stablecoin market. While this dominance supports trading, it means the redemption machinery for the majority of the sector runs through the balance sheets and banking relationships of just two companies, leaving the market vulnerable to shocks affecting either issuer.
Evaluating Future Depeg Events
Market participants monitoring future depegs look at specific factors to assess severity. Reserve-backed coins displaced by fear or banking hiccups typically recover once redemptions are proven, whereas algorithmic designs or opaque yield strategies may not. Observers also track redemption patterns alongside market prices to determine if a discount reflects normal processing or a deeper issue, while monitoring how contagion flows through interconnected DeFi lenders and collateral systems.
