What is a stablecoin depeg?
A stablecoin depeg is when a stablecoin's market price deviates from its target value. For dollar-pegged stablecoins, the target is $1.00. A depeg means the token is trading at $0.97, $0.90, or in the worst cases, close to zero.
Minor depegs happen constantly. Most are invisible to users, corrected within minutes by arbitrage traders before they affect any real transaction. Catastrophic depegs are rarer but far more consequential. The TerraUSD (UST) collapse in May 2022 erased approximately $40 billion in market value. The USDC depeg in March 2023 briefly sent the price to $0.8789 before it recovered.
According to Moody's, there were 1,914 depeg events through mid-2023, with 609 involving major stablecoins.
Why do stablecoins depeg?
The causes differ depending on how the stablecoin maintains its peg. There are four main mechanisms.
- Reserve or counterparty failure: Fiat-backed stablecoins hold reserves in banks and Treasury instruments. If those reserves become inaccessible or are revealed to be insufficient, confidence collapses. This is what happened with USDC in March 2023. Circle disclosed that $3.3 billion of its reserves were held at Silicon Valley Bank when the bank failed. USDC immediately fell to $0.8789. It recovered within days after US authorities guaranteed all SVB deposits, but the event demonstrated that even a well-reserved stablecoin carries banking counterparty risk.
- Algorithmic mechanism failure: Algorithmic stablecoins maintain their peg through supply and demand mechanics rather than actual reserves. TerraUSD (UST) used a mint-and-burn relationship with its sister token LUNA. When confidence broke in May 2022, the mechanism minted LUNA to absorb selling pressure. LUNA's supply exploded from roughly 342 million to 6.5 trillion tokens. This destroyed LUNA's value, which destroyed the only backing UST had. The resulting death spiral erased approximately $40 billion in market value.
- Mass redemptions (bank run): A surge in redemption requests can drain on-chain liquidity faster than new supply can be minted, temporarily pushing the price below $1. USDT fell briefly to around $0.95 in May 2022 as contagion from the UST collapse triggered broad panic about stablecoins generally.
- Regulatory action: A regulator ordering an issuer to halt new minting can trigger market uncertainty. BUSD faced this in February 2023 when the NYDFS ordered Paxos to stop issuing new tokens, causing sustained price pressure as holders sought to exit.
What is the difference between a temporary and a catastrophic depeg?
These two types look similar on a price chart but resolve very differently.
- Temporary depegs happen when the price moves away from $1 but the underlying reserves remain intact. Arbitrage traders buy the discounted token, knowing they can redeem it for $1 at the issuer. This buying pressure drives the price back toward parity. USDC in March 2023 is the clearest example of a temporary depeg. The reserves were sound. Confidence returned once the SVB situation was resolved, and the peg recovered fully.
- Catastrophic depegs happen when the underlying backing fails entirely. Arbitrage cannot restore the peg if there is nothing to redeem against. UST in May 2022 is the defining example. No amount of buying pressure could restore a peg backed by a token whose value was simultaneously collapsing.
How does a depeg affect stablecoin payments?
For businesses using stablecoins to move money, a depeg during a payment changes the value the recipient receives. A stablecoin sandwich payment converts fiat to stablecoin at the start and back to fiat at the end. If the stablecoin depegs between those two conversions, the recipient receives less than the sender intended.
Most payment platforms manage this by locking the exchange rate at initiation and settling quickly. A sub-second settlement on Solana leaves almost no window for a depeg to affect the transaction. A settlement that takes minutes or hours on a slower network creates more exposure.
How do you assess depeg risk before using a stablecoin?
Not all stablecoins carry the same depeg risk. The main factors to evaluate are:
- Reserve composition: Are reserves held in cash, short-term Treasuries, or higher-risk assets? Treasury-backed reserves are more liquid and less exposed to counterparty failure than bank deposits or commercial paper. See stablecoin reserves for a detailed breakdown
- Attestation frequency: Monthly attestations from a reputable accounting firm confirm reserves match supply. Less frequent or unverified disclosures leave more room for reserve problems to go undetected
- Depeg history: Has the stablecoin depegged before? How quickly did it recover? A stablecoin with a clean recovery record in past stress events carries less uncertainty than one with an unresolved episode
- Backing model: Fiat-backed stablecoins with transparent reserves carry lower depeg risk than algorithmic models. The UST collapse effectively ended institutional confidence in pure algorithmic designs
- Market depth: A stablecoin with thin on-chain liquidity is more vulnerable to temporary depegs from large redemptions, even if reserves are adequate
For platforms using stablecoin orchestration to route cross-border payments, stablecoin selection is a direct risk management decision. The stablecoin reserves entry covers how reserve quality differs across the major issuers.
