Depeg

Key points

• Depeg is the situation in which a pegged currency, such as a stablecoin, loses its parity with its reference and no longer holds its promised value.
• It can be temporary, with the price returning to parity, or permanent, when trust in the backing or the mechanism is broken for good.
• It is one of the main risks of stablecoins, especially those that rely on opaque reserves or fragile algorithmic mechanisms.

What is a depeg?

Depeg is the breaking of the anchor that keeps a pegged currency at parity with its reference. A dollar stablecoin should always be worth around one dollar; when it starts trading noticeably below or above that, it is said to have suffered a depeg. The term describes both small, temporary swings and deep collapses, in which the asset loses most of its value.

How it works

A stablecoin's peg depends on the trust that it can be converted at its reference value. As long as that trust exists, arbitrage corrects small deviations: if the price falls below parity, traders buy it cheap to redeem it at full value, pushing the price back up. This mechanism keeps the price close to the anchor most of the time.

Depeg happens when something shakes that trust or breaks the correction mechanism. It can be suspicion that reserves are insufficient, a lack of liquidity to meet redemptions, the freezing of the funds backing the currency, or, in the case of algorithmic stablecoins, a failure of the design itself. When many people try to exit at the same time, the price plunges and the correction mechanism cannot keep up.

Some depegs reverse once the cause is clarified and trust returns. Others are terminal, especially when the backing turns out to be nonexistent or insufficient.

Why it matters

For those who use stablecoins as a settlement layer, depeg is the central risk: it means the asset thought to be stable stops being trustworthy at the worst possible moment. Understanding what sustains each stablecoin's peg, and what could break it, is part of assessing where to safely store value.

Risks and limitations

Not every price deviation is a meaningful depeg: small market fluctuations are normal and self-correct. Telling a passing scare apart from a real collapse requires looking at the cause, which is not always possible in time. Because trust disappears quickly, a depeg can accelerate on its own, making it hard to react once it begins.