What Is Depegging?
A stablecoin “depegs” when its price deviates significantly from its target value — usually $1. Minor deviations (0.1-0.5%) happen regularly and aren’t cause for concern. But when a stablecoin drops to $0.90 or below, it’s a depegging event.
Major Depegging Events
1. TerraUSD (UST) — May 2022
The most catastrophic stablecoin collapse in history.
| Detail | Info |
|---|---|
| Starting price | $1.00 |
| Lowest price | $0.01 |
| Final outcome | Collapsed — never recovered |
| Value destroyed | $40B+ |
| Cause | Algorithmic death spiral |
What happened: UST was an algorithmic stablecoin maintained by its sister token, LUNA. When UST dropped below $1, traders could burn UST to mint LUNA (and vice versa), theoretically creating arbitrage pressure to restore the peg.
On May 7, 2022, large withdrawals from Anchor Protocol (where most UST was staked for 20% yield) triggered a sell-off. UST dropped to $0.98, then $0.90, then $0.80. As people burned UST to mint LUNA, LUNA’s supply skyrocketed, crashing its price. This made the arbitrage mechanism worthless, creating a death spiral.
Lesson: Algorithmic stablecoins without robust collateral backing are inherently fragile. The 20% yield on Anchor was unsustainable and attracted capital that fled at the first sign of trouble.
2. USDC — March 2023
A brief but scary depeg caused by banking sector turmoil.
| Detail | Info |
|---|---|
| Starting price | $1.00 |
| Lowest price | $0.87 |
| Recovery time | ~48 hours |
| Cause | $3.3B stuck at Silicon Valley Bank |
What happened: Circle (USDC’s issuer) held $3.3 billion of USDC’s reserves at Silicon Valley Bank. When SVB failed on March 10, 2023, those funds were temporarily inaccessible. Panic spread, and USDC dropped to $0.87.
However, the US government announced a backstop for SVB depositors on March 12. USDC recovered to $0.99 within hours and $1.00 within two days.
Lesson: Even fully-backed stablecoins can depeg if their banking partners fail. But with genuine reserves, recovery is typically swift once the underlying issue resolves.
3. DAI — March 2023
Collateral contagion from USDC.
| Detail | Info |
|---|---|
| Starting price | $1.00 |
| Lowest price | $0.92 |
| Recovery time | ~3 days |
| Cause | USDC collateral contamination |
What happened: DAI is partially backed by USDC (at the time, about 50% of DAI’s collateral was USDC). When USDC depegged due to the SVB crisis, DAI’s effective collateral value dropped, causing DAI to depeg as well.
Lesson: Decentralised stablecoins aren’t immune to centralised failures if their collateral includes centralised assets.
4. USDT — June 2022
Contagion-driven temporary depeg.
| Detail | Info |
|---|---|
| Starting price | $1.00 |
| Lowest price | $0.95 |
| Recovery time | ~5 days |
| Cause | Celsius/3AC crypto contagion panic |
What happened: During the collapse of Celsius Network and Three Arrows Capital (3AC), panic spread across crypto markets. Traders fled to fiat, selling USDT en masse. USDT briefly dropped to $0.95.
Tether processed $7B in redemptions in 48 hours, demonstrating that their reserves could handle the stress. USDT recovered within days.
Lesson: Even the largest stablecoin can wobble during market panic, but genuine reserves and functioning redemption mechanisms allow recovery.
5. FRAX — Multiple minor depegs
Algorithmic component creates periodic wobbles.
FRAX, a fractional-algorithmic stablecoin, has experienced multiple minor depegs (to $0.97-0.98) during market stress. The protocol has always recovered, but the algorithmic component makes it more volatile than fully-backed alternatives.
Why Depegging Happens
Loss of Confidence
The most common cause. If users believe a stablecoin might not be fully backed, they rush to exit, creating a self-fulfilling prophecy.
Reserve Impairment
When the assets backing a stablecoin lose value or become inaccessible (SVB collapse, commercial paper defaults).
Market Stress
During crypto market crashes, massive sell-offs can overwhelm stablecoin markets temporarily.
Smart Contract Failures
For crypto-backed and algorithmic stablecoins, bugs or exploits can undermine the peg mechanism.
Regulatory Action
Government seizures, freezing orders, or regulatory shutdown of the issuer can break the peg.
Liquidity Crises
If there aren’t enough buyers at $1, the price can drop simply from selling pressure.
Early Warning Signs
For Fiat-Backed Stablecoins
- Delayed or missing reserve attestations
- Changes in reserve composition (riskier assets appearing)
- Regulatory investigations or enforcement actions
- Withdrawal delays or limits
- Unusual on-chain movements from issuer wallets
For Crypto-Backed Stablecoins
- Collateralisation ratio dropping below safe thresholds
- Governance proposals that could change risk parameters
- Concentration of collateral in a single asset
- Declining protocol usage and liquidity
For Algorithmic Stablecoins
- Yield rates that are unsustainable (anything above 15%)
- Declining market cap
- Reduced liquidity on exchanges
- Governance token price declining (affects the peg mechanism)
How to Protect Yourself
Diversify
- Never hold more than 50% in any single stablecoin
- Mix fiat-backed (USDC, USDT) with crypto-backed (DAI)
- Avoid algorithmic stablecoins entirely unless you’re speculating
Monitor
- Set price alerts for your stablecoins (alert at $0.98 and $1.02)
- Follow issuer announcements and reserve reports
- Monitor crypto news for mentions of your stablecoins
Have an Exit Plan
- Know which exchanges allow quick conversion to fiat
- Keep accounts on 2-3 exchanges pre-funded
- Understand the redemption process for each stablecoin you hold
Use the Safest Options
- USDC — Most transparent, MiCA-compliant
- USDT — Largest, most liquid, proven through crises
- DAI — Decentralised, over-collateralised, battle-tested
Conclusion
Depegging events are rare but can be catastrophic — as Terra/UST showed. The good news is that the major stablecoins (USDT, USDC, DAI) have all demonstrated resilience through multiple crises. By understanding the causes of depegging and taking sensible precautions, you can significantly reduce your risk.
The key takeaway: avoid algorithmic stablecoins, diversify your holdings, and always have an exit plan.