What happens when a stablecoin drops below its peg

26 September 2026

A stablecoin that drops below its peg has lost its intended 1:1 value relationship with the target asset, usually the US dollar. The immediate consequences include broken arbitrage loops, loss of user confidence, and potential collapse of the stablecoin system. Recovery is possible but depends on the type of stablecoin and the cause of the deviation.

How a depeg starts

A stablecoin trades below its peg when selling pressure exceeds buying pressure at the target price. This can happen for several reasons:

• A large holder sells off a significant position, perhaps due to a withdrawal freeze or hack
• The market suddenly doubts the backing assets - for example, if a reserve bank collapses or a proof-of-reserves report is missing
• The minting and redemption mechanism itself stops working (covered in the arbitrage loop article on this site)

Once the price moves a few cents below $1, the normal arbitrage mechanism should kick in. Traders buy the cheap stablecoin and redeem it with the issuer for $1 worth of collateral, pocketing the difference. When that loop fails to restore the peg, the situation becomes serious.

Immediate Effects on Users and Markets

Holders of the stablecoin see their balance lose dollar value. If the stablecoin trades at $0.95, every $100 of holdings is suddenly worth $95. For users who treat the stablecoin as cash, this is a direct loss.

Exchanges and trading pairs that use the stablecoin as a quote currency begin to show distorted prices. A token priced at 10 USDC during a depeg might actually be worth less than $10 in real dollars. Traders relying on those pairs for hedging or settlement face unexpected losses.

Liquidity pools on decentralized exchanges can become toxic. If a pool holds a depegged stablecoin alongside another asset, liquidity providers may find their positions drained by arbitrageurs who extract value from the imbalance.

The rescue attempt: what issuers and markets do

If the stablecoin is fiat-backed

The issuer should be able to honor redemptions at $1 if the reserves are intact. The problem is often access: if the bank holding the reserves is closed or frozen, redemptions stop. In that case, the market price falls further because the arbitrage loop cannot operate. Recovery requires the issuer to demonstrate that reserves exist and that redemptions will resume.

If the stablecoin is crypto-backed

Overcollateralized stablecoins like those using MakerDAO's system can survive a temporary depeg if the collateral remains sufficient. The issuer may raise stability fees (see the article on stability fees and interest rates) to encourage holders to burn the stablecoin and reduce supply. If the depeg is caused by a collateral price crash, the system may trigger liquidations of borrower positions, which can worsen the sell-off.

If the stablecoin is algorithmic

Algorithmic stablecoins have no reserve to redeem against. A depeg here is existential: the expansion and contraction mechanism (covered in the algorithmic seigniorage article) is supposed to adjust supply, but if demand collapses, the contraction cannot shrink supply fast enough. The price can spiral toward zero as holders panic-sell.

What happens after a failed recovery

When a stablecoin fails to return to its peg, the consequences cascade:

1. Secondary market discounting: The stablecoin trades at a persistent discount - $0.90, $0.80, lower. Exchanges delist it or convert it to a "debt token" status.

2. Loss of utility: No one accepts it as payment. Lending protocols freeze or liquidate positions using it as collateral.

3. Bank run on issuers: For fiat-backed coins, the depeg triggers a rush to redeem. If the issuer cannot process all requests, the stablecoin effectively defaults.

4. Systemic contagion: Other stablecoins may come under suspicion. Entire DeFi applications that depend on that stablecoin for pricing or settlement can halt or fail.

The Historical Pattern

Multiple stablecoins have dropped below their peg and never recovered. In every case, the root cause was the same: the mechanism that promised to restore the peg could not function when tested. The arbitrage loop works only when the issuer can honor redemptions or when the market believes the mechanism will eventually work. Once that belief breaks, the price stays broken.

A depeg below $1 is not automatically fatal. Fiat-backed stablecoins have traded at $0.97 - $0.99 during bank scares and later recovered when the issuer confirmed reserves were safe. The difference between a temporary wobble and a permanent collapse is whether the underlying backing is real and accessible.

What to Do If You Are Holding a Depegged Stablecoin

• Check the issuer's latest statements on redemptions and reserve status
• Compare the on-chain price across multiple exchanges - a single exchange showing a depeg may be a liquidity glitch
• Decide whether to sell at the discounted price or wait for a recovery. There is no guaranteed outcome, and past recoveries do not predict future ones
• If the stablecoin is used in a lending or trading position, monitor liquidation thresholds closely

A stablecoin below its peg is a signal that something is wrong with the system that is supposed to keep it stable. The severity depends on the cause, but the effect on holders is always the same: their stable asset is no longer stable.

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