Stablecoins Explained: The Crucial Bridge Between Fiat Currencies and Crypto

Why stablecoins exist

Most cryptocurrencies are too volatile to serve as a reliable unit of account. Traders need a stable asset to move into without leaving the blockchain, decentralized finance needs collateral and loans denominated in a familiar currency, and businesses sending payments across borders need predictable value.

Stablecoins fill those gaps. They settle within minutes at any hour, can be held in any compatible wallet and can be programmed into smart contracts. In some countries with unstable currencies, dollar-pegged stablecoins also serve as an accessible store of value.

Fiat-backed stablecoins

The largest stablecoins are backed by reserves of traditional assets, typically cash, bank deposits and short-term US government debt. Tether's USDT, launched in 2014, and Circle's USD Coin (USDC), launched in 2018, are the best known. Approved customers can usually redeem tokens for dollars directly with the issuer, which helps keep market prices close to the peg.

The model depends on trust in the issuer and the quality of the reserves. Transparency varies between issuers, ranging from regular attestations by accounting firms to more limited disclosures. Reserve composition matters too: short-term government debt is generally more liquid and safer than commercial paper or riskier assets.

Crypto-collateralized stablecoins

Crypto-collateralized stablecoins are created when users lock other cryptocurrencies in smart contracts. DAI, launched by the MakerDAO project in 2017, is the best-known example. Because crypto collateral is volatile, these systems require overcollateralization, so a user might lock 150 dollars or more of collateral to mint 100 dollars of stablecoins.

If collateral value falls too far, positions are liquidated automatically to keep the system solvent. This design avoids reliance on a single company's bank accounts, though in practice many such systems have added fiat-backed stablecoins and tokenized government bonds to their collateral to improve stability.

How stablecoins are used in practice

Most stablecoin activity still happens inside crypto markets. Traders park funds in stablecoins between positions, exchanges quote many trading pairs against them, and DeFi protocols use them as the main asset for lending, borrowing and liquidity pools. Their use outside trading is growing, particularly for cross-border payments, payroll for remote workers and settlement between businesses that want to move value outside banking hours.

Issuers of reserve-backed stablecoins earn money mainly from the interest on their reserves. When short-term interest rates are high, that income can be substantial, which helps explain why the business attracted new entrants once rates rose from near zero. Holders usually receive none of that interest directly, which is one reason platforms that offer yield on stablecoins must generate it through lending or other activities.

Algorithmic stablecoins and the Terra collapse

Algorithmic stablecoins attempt to hold their peg mainly through supply adjustments and incentives rather than full collateral. The most prominent example, TerraUSD, used a mechanism linked to its sister token LUNA. In May 2022 confidence broke, redemptions accelerated, and both tokens collapsed within days, wiping out tens of billions of dollars in value.

The episode showed how such designs can enter a death spiral: as the stablecoin loses its peg, the mechanism creates more of the sister token, its price falls further, and confidence erodes. Since then, purely algorithmic designs have attracted far less trust.

How stablecoins lose their peg

Even well-backed stablecoins can trade below one dollar briefly when markets doubt the reserves. In March 2023, USDC fell well below its peg for a weekend after Circle disclosed that part of its reserves was held at Silicon Valley Bank, which had failed. The price recovered once US authorities guaranteed the bank's deposits.

The main warning signs of peg stress are listed below. Watching them is especially important for anyone holding large stablecoin balances or using them as collateral.

• Doubts about the size, quality or accessibility of reserves.
• Concentration of reserves at a single bank or custodian.
• Redemption restrictions or delays.
• Sharp drops in the value of collateral for crypto-backed designs.
• Regulatory actions that limit issuance or redemptions.

Regulation is catching up

Governments increasingly treat stablecoins as payment instruments that need rules. The European Union's Markets in Crypto-Assets regulation introduced requirements for stablecoin issuers that took effect in June 2024, covering authorization, reserves and redemption rights. In the United States, the GENIUS Act, signed into law in July 2025, created a federal framework for payment stablecoins, including reserve and disclosure requirements.

Clearer rules may increase confidence and bring more traditional financial institutions into the market. They may also limit which stablecoins are available in certain jurisdictions and impose stricter standards on reserve management.

Practical considerations for users

Before holding stablecoins, it helps to know which type you are using, who issues it, how reserves are held and how redemption works. Spreading large balances across issuers reduces dependence on one company, and holding them on reputable platforms or in self-custody reduces exposure to a single exchange.

Stablecoins aim for stability, but they are not bank deposits and generally lack deposit insurance. Any yield offered on stablecoins comes from lending or other risk-taking. This guide is educational rather than financial advice.