What Is a Stablecoin?

If you were asked to describe crypto, chances are one of the first words that would come to mind is volatile. Perhaps even unstable.

And that would be a fair assessment.

Despite their potential, most cryptocurrencies are known for extreme price swings, gaining (or losing) double digits in a matter of days. That makes them exciting for speculation, but less practical for real-world transactions or cash management.

Stablecoins aim to solve that problem. As the name implies, these digital assets are designed to be a more stable, functional foundation for the crypto ecosystem. Let’s explore how stablecoins work, what enables their stability, and the different types you’re most likely to encounter — along with the uncertainty still surrounding their role.

A stablecoin is a type of cryptocurrency that, ideally, maintains its value in order to serve as a reliable medium of exchange, store of value, and unit of an account that doesn’t fluctuate wildly day to day. Typically, a stablecoin attempts to achieve this by pegging its price to a stable asset like the US dollar.

In short, stablecoins introduce price stability to an otherwise volatile market. This makes them uniquely positioned as a bridge between traditional finance and the digital asset world, combining the speed and accessibility of crypto with the reliability and trust of fiat currency.

And the market is no small niche. Stablecoins currently represent more than $260 billion in total market value — roughly on par with the GDP of countries like Portugal or New Zealand!

The most common stablecoins, such as USDC (USD Coin) and USDT (Tether), are pegged 1:1 to the US dollar. So, for instance, one USDC is intended to be worth one dollar, regardless of what’s happening in the crypto market.

Different Types of Stablecoins

While most stablecoins share the same goal (maintaining a steady value), there are different approaches to achieve that stability. The three primary types are:

Fiat-Collateralized Stablecoins

These are the most straightforward. Fiat-backed stablecoins like USDC and USDT are pegged 1:1 to a traditional currency — typically the US dollar — and backed by reserves held in custody by the issuer.

In theory, every stablecoin in circulation should be matched by an equivalent dollar (or dollar-equivalent asset) in reserve. For example, USDC’s supply and reserves are publicly disclosed by its issuer, Circle. At any given time, the majority of reserves are allocated to US Treasurys in the Circle Reserve Fund (USDXX), managed by BlackRock, while the rest is held in cash across partner banks.

Crypto-Collateralized Stablecoins

Crypto-backed stablecoins, such as DAI, are secured by other cryptocurrencies instead of fiat currency. Because crypto assets are more volatile, these stablecoins are typically overcollateralized, meaning more than $1 in crypto is held for every $1 of stablecoin issued.

Smart contracts automatically manage collateral levels and help support the peg, adjusting positions when volatility increases. This decentralized model provides greater transparency, but also adds layers of complexity and risk.

Algorithmic Stablecoins

Algorithmic stablecoins don’t rely on traditional reserves. Instead, they use supply-and-demand algorithms to hold their target price — minting or burning coins to keep the price aligned with the peg.

While practical in theory, this model has a troubled track record (which we’ll explore later). Some high-profile failures have raised concerns about long-term viability and systemic risk, especially during periods of market stress.

Why Are Stablecoins Important to Investors?

If you aren’t involved in digital assets, stablecoins probably aren’t very relevant to you. If you are — or if you’re considering doing so — then they’re important to understand, for a few reasons.

In the crypto world, stablecoins function like digital cash. Just as you’d use cash as a means of exchange or store of value in your investment portfolio, investors often use stablecoins for these purposes in their crypto wallets.
Stablecoins can also serve as a stepping stone to more advanced strategies, like liquidity pooling or borrowing and lending. These coin deposits can earn interest, too.
During volatility, stablecoins can offer a way to de-risk a crypto portfolio without leaving the ecosystem altogether. That said, this type of asset is not without its own risks.

What Are the Risks of Stablecoins?

No investment is risk-free. That’s certainly still the case for digital assets, even for ones trying to emulate fiat currency. Just the perceived stability of stablecoins can mask underlying vulnerabilities.

Here are a few key risks worth understanding:

Peg Failure

The most fundamental risk is a stablecoin losing its peg — the very thing it’s designed to protect. When a stablecoin slips significantly from its target value (usually $1), confidence can unravel quickly.

Arguably the most infamous example is TerraUSD (UST). Backed by an algorithm (versus tangible reserves), UST collapsed in 2022, wiping out billions in value and illustrating that not all pegs are created equal.

Reserve Transparency

For fiat-backed stablecoins, trust hinges on what’s behind the curtain. If a stablecoin claims to be backed 1:1 by reserves, investors should reasonably expect third-party-audited evidence of that.

Unfortunately, not all issuers provide consistent or transparent reporting. Questions around reserve quality (e.g., cash vs. commercial paper), audit frequency, and the credibility of custodians can all impact confidence. Without transparency, even a fiat-backed stablecoin can feel risky.

Platform and Counterparty Risk

Most stablecoins (even fiat-backed ones) rely on centralized issuers, custodians, and platforms. That means there’s always a degree of counterparty risk: if the issuer faces financial trouble for whatever reason, stablecoin holders could be affected.

This is especially true for users who store their stablecoins on centralized exchanges or platforms, where access and control can be limited. If the platform fails, even the most “stable” coin may be hard to retrieve.

Regulatory Scrutiny

As stablecoins grow in scale and usage, they’re drawing increased attention from global regulators. Regulation could provide guardrails and legitimacy, but it also presents uncertainty. Changes to legal frameworks, reserve requirements, or capital controls could affect how certain stablecoins operate, or whether they can operate at all.

Investor Takeaways

If you’re interested in digital markets (and by extension, stablecoins), there are a few things to keep in mind.

Stablecoins are not intended to appreciate. They’re designed to hold a steady value. But they can play a supporting role, like facilitating trades or providing liquidity.
Not all stablecoins are created equal. Before using or holding one, assess the issuer’s reserves and audit process.
You can’t avoid risk. Stablecoins should be less volatile than other cryptos, but they’re still subject to risks.
Regulation is still evolving. Consider how and where your stablecoins are held.