The Depegging Crisis of Stablecoins: Lessons from the USDC and DAI Incidents on Depeg Risks

Depeg was once the most concerning term in the cryptocurrency market in 2023. When stablecoins like USDC and DAI, which promised to be pegged to the dollar at a 1:1 ratio, suddenly dropped to $0.90, the entire crypto community realized a serious issue: even the "safest" coins could face a crisis of trust. This episode of depegging not only exposed the vulnerabilities in the design of stablecoins but also rang alarm bells for all investors.

## What is Depeg? Why do stablecoins suddenly lose their peg?

Depeg describes the situation where the price of a stablecoin deviates from its promised pegged price (usually the dollar). In theory, the reserve assets backing a stablecoin should always correspond to the issuance at a 1:1 ratio, ensuring that users can redeem at the agreed price at any moment. However, when this promise is broken, the market begins to question, "Can this coin still be worth $1?" and the price subsequently falls.

This is not a theoretical issue. Events in 2023 proved that even large-scale, well-established stablecoins are not immune. Depeg not only means a sudden shrinkage of user assets, but also signifies a collapse of confidence in the entire ecosystem.

## The USDC Reserve Controversy: An $8.7 Billion Lesson

USDC, issued by Circle, claims to be 100% backed by the dollar and is regarded as the most reliable stablecoin in the crypto market. However, a disclosure in March 2023 completely changed this perception: approximately $8.7 billion of USDC reserves were held at the now-failed Silicon Valley Bank.

This revelation triggered a chain reaction. Coinbase immediately suspended the conversion channel between USDC and the dollar, and Binance closed its 1:1 conversion service between USDC and BUSD. Panic spread in the market, and the price of USDC began to decline—Depeg was occurring. This incident clearly demonstrates that the security of stablecoins depends not only on the digital assets themselves but also on the management of the underlying reserves. Storing such a large reserve in a single banking institution is a fatal systemic risk.

## DAI's Chain Reaction: Exposure of Cross-Protocol Vulnerabilities

Compared to USDC, DAI is a stablecoin issued by the decentralized protocol MakerDAO, which should maintain stability through over-collateralization with crypto assets. However, when USDC depegged, DAI could not remain unscathed—because 45% of DAI's reserves were actually supported by USDC.

The result was a 7% drop in DAI's price, deviating from its dollar peg. This exposed a deeper issue: even decentralized stablecoins can fall into depeg dilemmas due to their interconnectedness with other stablecoins. The risks of one protocol can quickly transmit throughout the entire ecosystem.

## Insights for Investors from the Depeg Crisis

The stablecoin depegging events provide three core lessons.

First, the risk of concentrated reserve allocation is often overlooked. Whether in traditional finance or crypto finance, "putting all your eggs in one basket" is a fatal weakness. The case of USDC proves that even with a promise of dollar backing, if reserves are concentrated in a single institution, systemic risk looms.

Second, ecological interconnectedness creates hidden depeg trigger points. DAI’s depegging due to USDC’s influence indicates that investors must not only pay attention to the reserve status of individual coins but also understand the risk transmission chain within the entire ecosystem.

Finally, the concept of "the safest asset" needs to be redefined. The safety of stablecoins is not absolute but depends on ongoing scrutiny of various dimensions such as reserves, management, and market structure.

After the depeg crisis, wise investors began to focus on the reserve configuration behind stablecoins, the credit ratings of issuing institutions, and the risk exposures within the ecosystem. Conducting personal research, being wary of single points of failure, and diversifying stablecoin holdings are no longer mere suggestions but necessary self-protection measures.