What is Losing Peg? The Collapse of UST and Lessons from 2022

In the world of cryptocurrency, nothing causes more fear than “losing peg”—when a stablecoin no longer maintains its promised stable value. This event has caused millions of investors to lose everything and remains a painful story the crypto community cannot forget. So, what is losing peg, why does it happen, and how can you protect yourself?

Stablecoins and the concept of losing peg

Stablecoins are created with a single purpose: to keep their price stable at $1 USD. USDT, USDC, DAI, and other stablecoins all operate on a “pegged” principle—that is, they always maintain a value of $1 USD, regardless of crypto market fluctuations.

However, this peg is not always maintained. When a stablecoin can no longer hold its $1 USD value—for example, USDT drops to $0.95 or UST plummets to just $0.10—that’s when it has lost its peg. This is not just an economic event but also a trust crisis that deeply damages investors.

The UST incident: The greatest disaster in history

In 2022, the Terra ecosystem had a stablecoin called UST—once one of the most trusted projects in the market with a valuation in the billions USD. But one day, everything changed forever.

UST began to lose its peg. Its price fell from $1 to $0.9, then $0.8, then $0.3, and eventually just a few cents. The collapse happened so quickly that almost no one had time to react. LUNA—the native token of Terra—also got dragged down, dropping from over $100 to below $0.0001.

The consequences were catastrophic. Hundreds of millions of dollars in value were wiped out in just a few weeks. Some people lost billions, traders who rode high now fell into the abyss. Many small investors saw their assets vanish completely—100% of their investments burned. The pain was not just financial but also a loss of trust in the entire system.

Why do stablecoins lose peg? Three main reasons

Lack of collateral backing

Stablecoins are designed to be backed by real assets. If a issuer creates 1 billion USDT but only holds $100 million in reserves, losing the peg is only a matter of time. Market confidence will break down once investors realize this imbalance.

Market attacks and panic selling

UST was deliberately attacked to break its peg. Large sell-offs caused the price to drop, triggering panic and more selling. Once panic sets in, it’s very hard to stop the cascade.

Weak algorithmic mechanisms

UST was not backed by real USD but relied on LUNA to “balance” its value. This system is fragile. When LUNA’s price drops, the entire mechanism collapses like dominoes—each fall causing the next.

How to recognize losing peg and strategies to protect yourself

Not all stablecoins are equally “safe.” When you see warning signs—such as the stablecoin’s price starting to fluctuate or news about backing issues—be ready to withdraw your funds immediately before it’s too late.

Stablecoins to prioritize:

• USDT (Tether)—with transparent backing
• USDC (Circle)—also fully backed
• FDUSD, TUSD—high transparency
• DAI—more complex but designed with a robust mechanism compared to UST

Avoid stablecoins solely based on algorithmic mechanisms without real asset backing.

Lessons from the loss of peg incidents

A “peg”—the tether—forms the foundation of trust in stability. When that tether breaks, the damage is not just financial. It’s trust lost, opportunities missed, and in the worst cases, future prospects destroyed.

LUNA and UST have become blood lessons for the entire crypto market. They teach us that nothing is too big to fail, and no trust can last forever without a solid foundation. Learn from these mistakes—with vigilance and decisiveness—so that no one has to write: “I regret entering the crypto world.”