Peg and depeg

What is a peg and what is a depeg?

In the world of cryptocurrency and finance, pegging and depegging sit at the heart of how stablecoins and other assets maintain their value — and what happens when that balance breaks down.

What is a peg?

A peg is a fixed exchange rate established between two assets. In crypto, it refers to the target price a token is designed to maintain, usually by linking its value to a more stable asset to reduce price volatility.

• Target value. Stablecoins most commonly target a 1:1 ratio with a reference asset, typically the U.S. dollar.
• Mechanisms. Projects use different approaches to maintain the peg. Some back tokens with cash or cash-equivalent reserves, others rely on overcollateralized crypto assets, while some use algorithms to adjust supply and demand.

What is a depeg?

A depeg occurs when a pegged asset trades above or below its intended value.

• Price deviation. During a depeg, the token's market price no longer matches the value of the asset it is designed to track.
• Severity. Minor and short-lived price fluctuations — for example, trading at $0.998 instead of $1.00 — are relatively common and may resolve quickly. A sustained or significant deviation, however, can indicate that the peg is under stress.
• Causes. A depeg can result from declining market confidence, limited liquidity, weaknesses in the protocol, or issues affecting the reserves that support the asset.

Functions of peg and depeg

Functions of a peg:

• Price stability. A peg helps reduce the price volatility typically associated with freely traded cryptocurrencies such as Bitcoin and Ethereum.
• Medium of exchange. More predictable prices make pegged assets useful for payments, cross-border transfers, and temporarily holding value between transactions.
• DeFi infrastructure. In decentralized finance (DeFi), pegged assets are commonly used as collateral for lending, token swaps, and other protocol activities.
• Global trade. Outside the crypto sector, pegged exchange rates can support international trade and contribute to broader economic stability.

Functions and impacts of a depeg:

Although a depeg is generally considered an undesirable event, it can influence market behavior in several ways.

• Arbitrage activity. Small deviations from the target price may encourage arbitrage traders to buy or sell the asset, which can help move the price closer to its intended peg. However, there is no guarantee that this will happen.
• Market signal. A prolonged depeg may raise questions about the quality of an issuer's reserves, liquidity, or the design of the underlying protocol.
• Systemic risk. A significant depeg can contribute to liquidations across DeFi protocols and increase volatility in related markets.

Common examples

Examples of pegs:

• Fiat-backed. USDT (Tether) and USDC (USD Coin) are designed to maintain a 1:1 peg with the U.S. dollar and are backed by reserve assets.
• Commodity-backed. PAX Gold (PAXG) and Tether Gold are designed to track the price of physical gold held in custody.
• Crypto-collateralized. DAI targets a U.S. dollar peg using cryptocurrencies locked in smart contracts as collateral.

Notable examples of depegs:

• TerraUSD (UST) collapse (2022). The algorithmic stablecoin lost its peg during a rapid market collapse, eventually falling to less than $0.02. The event erased more than $60 billion in combined market value across the Terra ecosystem.
• USDC deviation (2023). Following the collapse of Silicon Valley Bank, where part of USDC's reserves were held, the stablecoin temporarily traded below its target value. The price later returned to approximately $1.00 after reserve concerns were addressed.

*This material is provided for informational purposes only and does not constitute financial, investment, or legal advice. Cryptocurrency markets are highly volatile. Cryptocurrency trading involves significant risk and can result in the loss of your invested capital. Always conduct your own research before making any financial decisions.