Stablecoin Depegs: Understanding the Causes and Consequences
A stablecoin is designed to maintain a peg with a traditional currency, typically the US dollar. It does this by holding assets or collateral that match the value of the tokens issued.
However, when a stablecoin depegs, its market price breaks away from the target value, resulting in a loss for holders. A depeg can be caused by various factors such as reserve or collateral problems, liquidity shortages, loss of confidence, algorithmic design flaws, and regulatory action.
The Terra's UST depeg in May 2022 is often cited as an example of how differently a depeg can play out. The coin was designed to maintain its peg through minting and burning tokens, but when a large wave of selling overwhelmed the mechanism, the price collapsed, and the token's value dropped below $1.
On the other hand, USDC's depeg in March 2023 was caused by a short-term access problem with one bank. Although the coin dropped to around $0.87, it quickly recovered once the reserve risk was resolved. The key difference between these two events is that USDC has real dollar reserves backing its tokens.
A stablecoin's type of collateral and transparency can separate temporary from permanent depeg outcomes. Real, verifiable reserves gave USDC a path back to $1, while an unbacked algorithmic design lost confidence in UST, leading to a permanent collapse.