Stablecoins are cryptocurrencies designed to hold a steady value by tying themselves to an external reference, most often a fiat currency. That link, known as a peg, is central to why people use stablecoins for trading, payments, and as a perceived safe place during market volatility. When a peg breaks, the effects can ripple across markets and projects.
Stablecoins use different methods to stay near their target price. Broadly, these methods fall into two groups: those backed by assets and those governed by automated rules. Each approach has tradeoffs in transparency, liquidity, and failure modes.
Collateralized stablecoins are supported by reserves that are meant to cover the tokens in circulation. The reserves can take several forms:
Important note: Reserve claims vary in transparency and auditability. Users should not assume full backing without evidence and should consider the liquidity and custodial arrangements behind the reserves.
Algorithmic stablecoins, also called non-collateralized, rely on smart contracts and algorithms to expand or contract supply according to demand. When the price slips below the target, the protocol attempts to reduce supply to raise the price; when the price exceeds the peg, it issues more tokens to bring the value down. This mechanism can be elegant, but it depends on market confidence and can break under stress.
A depegging occurs when a stablecoin trades consistently away from its intended reference price. Because many traders and systems use stablecoins as a proxy for fiat, a prolonged depeg can cause liquidity shortages, force forced liquidations, and produce wider market stress. In severe cases, contagion may affect unrelated projects that relied on the stablecoin.
Studying past incidents highlights how different designs and external shocks can undermine a peg.
In 2022, an algorithmic stablecoin lost its peg and triggered a rapid collapse in its ecosystem, which included its sister token that had previously been among the top cryptocurrencies by market value. The event wiped out large market value, created panic among counterparties, and showed how intertwined tokens and leverage can accelerate a crash.
When several regional banks failed, a top fiat-backed stablecoin revealed that a substantial portion of its cash reserves had been held at one of those institutions. That exposure caused a sudden drop in the stablecoin's price as users rushed to redeem, and it also affected other coins that held that stablecoin as collateral. The episode underscored the risk of concentrated banking relationships and the need for diversified, liquid reserves.
A USD-pegged coin that relied on tokenized real estate and another stablecoin as collateral faced a wave of redemption requests that quickly exhausted its liquid reserves. Much of the remaining collateral was illiquid and difficult to convert quickly because it used a non-fungible token standard that does not lend itself to rapid fractionalization. The result was a liquidity crunch and loss of confidence, demonstrating the danger of pairing illiquid assets with immediate redemption obligations.
To reduce exposure to stablecoin failures, consider these checks before relying on any token:
Stablecoins play a vital role in digital markets, but their safety depends on design choices, reserve quality, and external conditions. Learning how a stablecoin maintains its peg and where its risks lie can help you make more informed decisions and reduce surprise during market disruptions.
