July 21, 2026

A stablecoin is a cryptocurrency designed to hold a stable price, usually pegged 1:1 to a fiat currency like the US dollar. The point is to get the settlement and programmability properties of a blockchain (instant transfer, 24/7 availability, composability with smart contracts) without the price volatility that makes something like Bitcoin unusable as everyday money. You can move a stablecoin across the world in minutes, hold it in a self-custodied wallet, or plug it into a DeFi protocol, all while it’s still worth roughly one dollar tomorrow as it was today.

How the peg is maintained

There are three broad approaches, and the mechanism matters more than the marketing:

• Fiat-collateralized. For every token issued, the issuer holds one dollar (or equivalent) in reserve: cash, short-term Treasuries, or similar. Redemption is a direct claim on those reserves. USDT (Tether) and USDC (Circle) are the largest examples. The peg holds as long as the reserves are real, liquid, and the issuer honors redemptions. This is the simplest model and also the one that puts the most weight on trust in a centralized custodian.
• Crypto-collateralized. The peg is backed by other cryptocurrencies, over-collateralized to absorb price swings: deposit $150 of ETH to mint $100 of the stablecoin, for instance. DAI (now part of the Sky/MakerDAO ecosystem) is the standard example. This avoids depending on a bank account, but it inherits crypto market volatility and needs liquidation mechanisms that can fail under extreme stress.
• Algorithmic. No full collateral backing at all: the peg is maintained through incentives and supply adjustments, often paired with a second token that absorbs volatility. This is the model that failed publicly and badly: TerraUSD (UST) collapsed in May 2022, wiping out roughly $40 billion in value in a matter of days when its arbitrage mechanism with the LUNA token broke under a large enough sell-off. Algorithmic stablecoins are the reminder that “stable” is a claim about mechanism design, not a guarantee.

What they’re actually used for

The use case that dominates by volume isn’t retail payments: it’s crypto trading infrastructure. Stablecoins are the base pair on nearly every exchange, letting traders move between volatile assets without cycling back through a bank each time. Beyond trading, the two use cases with real traction are cross-border remittances (settlement without correspondent banking delays) and dollar access in countries with unstable local currencies or capital controls, where a stablecoin wallet is a more practical way to hold dollars than an actual bank account.

Regulation is catching up

For most of their existence, stablecoins operated in a regulatory gray zone. That has been changing: reserve composition, redemption rights, and issuer licensing are now the focus of legislation in the US, EU (through MiCA), and elsewhere, largely in response to Tether’s history of opacity around its reserves and the Terra collapse. The regulatory direction is converging on a simple requirement: if you issue a token that claims to be worth a dollar, you need to prove, continuously, that you can actually redeem it for one.

That’s the core tension worth watching. The technology is straightforward: a token, a peg, a redemption promise. Whether that promise is backed by something real is a question about the issuer, not the blockchain.