Stablecoin Depeg History: Which Designs Held Up Under Stress?

By Chanuka Geekiyanage Oct 16, 2026

Every major stablecoin depeg since 2020 broke for a different reason, and the reason matters more than the price low. Fiat-backed coins like USDC and USDT dropped hard but recovered within days, while UST, xUSD, deUSD, and USR never came back. This article sorts the record by design, so you can see which structures survived real stress, which failed and why, and what to check before you park money in any of them.

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The Depeg Record at a Glance

Lows are approximate and vary by venue, so read them as the depth of the scare, not an exact price.

Stablecoin	Date	Approx. low	Design	Trigger	Outcome
UST	May 2022	~$0.35 on May 9, ~$0.14 by May 13	Algorithmic	Heavy selling on Anchor and Curve	Terminal, roughly $40B wiped out
USDT	May 2022	$0.95	Fiat-backed	Panic after UST	Recovered in days
USDC	Mar 2023	$0.87	Fiat-backed	$3.3B of reserves stuck at SVB	Back near $1 by Mar 13
DAI	Mar 2023	~$0.88	Overcollateralized	USDC was over half of collateral	Recovered with USDC
USDR	Oct 2023	~$0.50 to $0.53	Real estate plus DAI	Liquid DAI reserve redeemed out	Terminal
USDe	Oct 2025	$0.65 on Binance only	Delta-neutral synthetic	Venue pricing in a $19B liquidation cascade	Peg held on-chain, supply shrank
xUSD	Nov 2025	$0.10 to $0.43 by source	Yield-bearing, off-chain managers	$93M loss, withdrawals halted	No recovery
deUSD	Nov 2025	~$0.015	Synthetic	Backing tied to Stream	Sunset
USR	Mar 2026	As low as $0.025 on Curve	Delta-neutral synthetic	Compromised minting key	Limited redemptions
sUSD	2025 to Jun 2026	Below $0.70	SNX-backed	Loosened collateral rules	Retired

Fiat-Backed Stablecoins: Fast Scares, Fast Recoveries

Circle disclosed that $3.3 billion of roughly $40 billion in USDC reserves sat at Silicon Valley Bank when it failed. USDC fell to $0.87 because nobody could redeem against those funds over a closed banking weekend. The peg returned after US authorities said on March 12 that all SVB depositors would be made whole, and Circle said it would cover any shortfall itself.

The weak point was custodian concentration and weekend banking access, not asset quality. Circle also held $5.4 billion at BNY Mellon, and most of the rest was in Treasury bills.

USDT slipped to $0.95 on May 12, 2022, during the UST collapse. Tether’s CTO said $7 billion was redeemed in 48 hours, and Glassnode counted about $7.5 billion. USDT recovered because redemptions kept working, which is what actually restores a peg.

Overcollateralized Crypto Stablecoins: DAI, USDS and sUSD

DAI fell to about $0.88 in March 2023 because USDC made up more than half of its collateral. The Peg Stability Module (PSM), which swaps DAI and USDC one to one, passed USDC risk straight into DAI. Maker responded with an emergency vote to limit minting against such collateral.

The weakness showed earlier too. On March 12, 2020, ETH fell about 50% in a day, Ethereum congested, and liquidation auctions failed, leaving millions in bad debt. Maker added USDC as collateral that same month, so the later USDC dependence is partly the price of that fix. If you hold DAI or USDS, check the current collateral mix before each large deposit.

Synthetix’s sUSD shows the slower failure. SIP-420 cut the collateral requirement to 200% and pooled debt. The peg slid to 93 cents by May 2025, fell below $0.70 by February 2026, and the token was retired in June 2026 under SIP-423, with holders offered locked SNX. Overcollateralization only protects you if the collateral is independent of the token.

Algorithmic Stablecoins: UST

UST relied on a mint and burn link with LUNA instead of reserves, and Anchor’s roughly 20% yield created much of the demand. When large sales hit in early May 2022, Anchor deposits fell from $14 billion to $11.2 billion within days. UST dropped to about 35 cents on May 9, and LUNA fell from $80 to cents by May 12.

Falling UST minted more LUNA, which pushed LUNA lower, which weakened UST again. The design had no circuit breaker, and nothing in the record suggests a reflexive design like this belongs in a stablecoin allocation.

Delta-Neutral and Yield-Bearing Synthetics: The Current Failure Zone

Since late 2025, the breaks have come from synthetic dollars that pay yield. Coinpaprika’s September 2026 review found no major fiat-backed or CDP stablecoin broke 1% on aggregated pricing in 2026, while smaller synthetics kept failing. These designs fail in different ways.

USDe. On October 10, 2025, USDe printed $0.65 on Binance during a cascade that wiped out over $19 billion of leveraged positions. It stayed near $1 on Curve and other on-chain venues, and Ethena processed about $1.9 billion of redemptions over two days. The peg held, but supply fell from about $14.7 billion on October 9 to about $6.3 billion two months later.

LlamaRisk had also flagged that Ethena’s Aave allocation exceeded its advised 10% limit, which risks backing being lent out when redemptions arrive. A 2026 Ethena proposal said perpetual futures fell from about 93% of backing at the start of 2025 to 11%, so check the current composition, not the 2025 story.

xUSD and deUSD. Stream Finance disclosed a $93 million loss tied to an external fund manager and froze about $160 million of user funds. About $75 million of deUSD, roughly 90% of what remained, was held by Stream, and Elixir shut it down after 80% of holders redeemed. Some lending vaults that priced xUSD at a hardcoded $1 reportedly never liquidated, letting borrowers draw real stablecoins against near-worthless collateral. If you use these tokens inside yield products, how vault strategies handle depeg risk shows where a second layer of risk can sit.

USR. On March 22, 2026, an attacker used a compromised signing key to mint roughly $80 million of unbacked USR from a deposit of about $100,000 to $200,000. About $25 million was extracted. The contract reportedly checked for a valid signature but did not cap mint size against collateral, so off-chain approval services belong in a risk review next to reserves.

USDR was a related liquidity failure. It held tokenized real estate and a small liquid DAI reserve; the DAI was redeemed out, and the real estate could not meet a fast run.

Five Patterns That Repeat

Reflexive collateral fails. UST and sUSD depended on assets tied to their own ecosystem, so the backstop fell with the coin.
Redemption access beats reserve size. USDC and USDT recovered because redemptions worked, while USDR and xUSD had assets on paper but no way to cash out.
Concentration travels. DAI inherited USDC’s problem, and deUSD inherited Stream’s.
Price venue matters. USDe’s $0.65 was one order book.
Off-chain trust is a design choice. xUSD relied on fund managers and USR on a signing service.

How to Evaluate a Stablecoin Before Depositing

Collateral composition. Look for cash, Treasury bills, and independent assets, not the issuer’s own token.
Redemption path. Confirm who can redeem, in what size, how fast, and whether banking hours matter.
Custodian concentration. One bank holding a large share of reserves was the USDC problem.
Liquidity depth. Thin pools turn a small sell into a large depeg.
Mint controls. Look for caps, multisig approval, and published key management.
Yield source. If you cannot name where the yield comes from, you are the yield.
Lending exposure. Check whether backing assets are lent out, as with Ethena’s Aave allocation.

Image source: app.ethena.fi/dashboards/transparency

If a depeg is already underway, this stablecoin depeg guide covers what to do before you sell at the bottom. One live signal is the Curve pool balance, because one coin dominating a pool means arbitrage is not closing the gap.

Best Choice by User Type

User type	Recommended option	Reason
Beginner holding savings	USDC or USDT, split across both	Best stress record and deepest liquidity
DeFi user wanting on-chain collateral.	DAI or USDS, after checking the collateral mix	Transparent collateral, but USDC exposure is real
Yield seeker with a risk budget	A small USDe position	Redemptions worked in 2025, but supply and yield changed
Anyone offering high yield from an opaque strategy	Avoid	xUSD and deUSD fit this description

My Take

For core balances, I would hold major fiat-backed stablecoins and split between two issuers. They wobble but recover because redemption access works, and splitting protects against a single custodian or issuer event.

DAI and USDS are a reasonable second layer if you check the collateral mix. I would size USDe as a higher-risk position, since October 2025 showed a coin can hold its peg and still lose most of its supply, and beginners should skip it. I would not hold anything with an unverifiable off-chain manager, a single mint key, or collateral that is the coin’s own token. If yield is far above Treasury rates, assume the extra return pays for a risk you have not found yet. This is research, not financial advice.

Conclusion

The designs that held up let holders redeem at par and used collateral independent of the coin. USDC and USDT survived real scares in days, and DAI survived but inherited USDC risk. The designs that failed relied on reflexive collateral, hidden counterparties, illiquid reserves, or a single signing key.

The biggest current risk is smaller yield-bearing synthetics, not the large fiat coins. Before depositing, check collateral independence, redemption terms, mint controls, and the yield source, and keep core balances in the most battle-tested coins.

FAQs

1. Did USDC permanently lose its peg in March 2023?

No, USDC fell to $0.87 and returned close to $1 by March 13 after authorities guaranteed SVB deposits. The $3.3 billion at SVB was a small share of roughly $40 billion in reserves.

2. Was the USDe drop to $0.65 in October 2025 a real depeg?

It was real on Binance but not across the market, since USDe stayed near $1 on Curve and other on-chain venues. Ethena processed about $1.9 billion of redemptions, though supply later fell sharply.

3. Can a stablecoin depeg even when its reserves are intact?

Yes, USDC and USDR both showed that reserves can exist while holders cannot reach them fast enough. Redemption speed and access matter as much as reserve size.

4. Which stablecoin designs should I avoid?

Avoid reflexive algorithmic designs like UST, opaque yield products like xUSD, and single-key mint paths like USR. These failed without recovering.

5. Is DAI safer than USDC because it is onchain?

Not automatically, because DAI fell to about $0.88 in 2023 when USDC was over half its collateral. Check the current collateral mix, since the PSM can pass USDC risk straight through.

References

The Block, USDC will remain redeemable 1 for 1, Circle says: https://www.theblock.co/news/business/2023-03-11-usdc-will-remain-redeemable-1-for-1-with-u-s-dollar-circle-says-219075.

CoinDesk, The Fall of Terra timeline: https://coindesk.com/learn/the-fall-of-terra-a-timeline-of-the-meteoric-rise-and-crash-of-ust-and-luna

Decrypt, Tether loses dollar peg: https://decrypt.co/100173/tether-loses-dollar-peg-ongoing-stablecoin-crisis

Forklog, MakerDAO parameter changes: https://forklog.com/en/news/makerdao-to-adjust-protocol-parameters-to-limit-usdc-problems-impact-on-dai.

DIA, sUSD data page: https://www.diadata.org/map/global-stablecoins/stablecoin/susd/

Synthetix, SIP-423: https://sips.synthetix.io/sips/sip-423/

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About the Author: Chanuka Geekiyanage

Chanuka is a content writer, editor and contributor at Panaprium, specializing in long-form editorial articles. He conducts in-depth research and produces well-structured, carefully edited content with a strong focus on clarity, SEO best practices, and consistent formatting. His work spans lifestyle, fashion, wellness, and technical topics, and all articles are reviewed and refined to meet Panaprium’s editorial standards.

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