What is a stablecoin, really?

Strip away the jargon and a stablecoin is simple: a digital coin built to be worth exactly one dollar, that you can send to anyone in seconds. After a decade of hype and a few spectacular failures, that plain idea is quietly becoming real money. Here is how it actually works.

So what is a stablecoin, exactly?

It is a digital token pegged to a real currency, almost always the US dollar. The most common kind is “fiat-backed”: a company takes one real dollar, keeps it in reserve, and issues one token in return. Hand the token back, get your dollar back. The two giants work this way. As of mid-2026, Tether (USDT) was the largest at around $190 billion in circulation, and Circle’s USDC second at roughly $78 billion; together they are more than four-fifths of the market, and the total stablecoin supply had climbed past $320 billion.

The reserves are not a vault of cash. They are mostly short-term US government debt (Treasury bills) plus some cash: safe, liquid, and interest-bearing, which is also how the issuers make money. The better issuers publish where the money sits, and USDC’s reserves are attested by Deloitte.

Why does the price stay at one dollar?

Because you can always redeem one token for one real dollar. If a coin ever trades below a dollar, traders buy it cheap and redeem it for the full dollar, which pushes the price back up. The peg is only as good as the reserves behind it.

That last sentence is the whole risk. In March 2023, USDC briefly fell to about 87 cents when part of its cash reserves were stuck at the collapsing Silicon Valley Bank; it repegged within days once the funds were safe. The cautionary tale is worse: in 2022, an “algorithmic” stablecoin called UST, propped up by code and a sister token rather than real dollars, lost its peg and erased roughly $40 billion in days. The lesson stuck. The stablecoins people actually use today are backed by real, boring assets, not clever maths.

Did stablecoins really pass Visa?

You will see the headline everywhere: stablecoins moved more money in 2025 than Visa and Mastercard combined. By raw on-chain volume, it is true. Somewhere between $33 trillion and $62 trillion crossed the chains, against roughly $25 trillion for the two card networks.

It is also misleading, and a good explainer should say so. Most of that on-chain volume is not people paying people. It is trading bots, automated market-makers, and arbitrage shuffling dollars back and forth. Strip the inorganic activity out and real-economy payments were a much smaller $350 to $550 billion in 2025: real, but a rounding error next to the headline.

The honest version is the more interesting one. Genuine stablecoin payments are small today but growing fast, compounding at roughly 130% a year since 2023. Analysts who do the apples-to-apples maths expect real stablecoin payments to rival the card networks somewhere in the 2030s, not this year. The hype is early. The direction is not in doubt.

Why it matters for normal money

Set the trading aside and one thing is genuinely new: settlement. When you tap a card, the money does not actually move for a day or two. The networks are messaging each other, and the cash catches up later. A stablecoin transfer is the opposite: the value itself moves, on a public ledger anyone can check, and it is final in minutes, for cents, to anyone on earth.

That is why the quiet, useful corner of this space is payments that used to be slow, expensive, or impossible: cross-border payroll, supplier invoices, sending money home. And smaller things, too. A group of friends in three countries can settle a shared tab in seconds, in dollars, without a single bank transfer, which is exactly what Spliz does. No FX desk, no IBANs, no waiting on the slow payer.

Are they regulated now?

This is the part that changed everything in the last year. For most of their life, stablecoins lived in a legal grey zone. Not anymore. In July 2025 the United States passed the GENIUS Act, its first federal stablecoin law: issuers must back every token one-for-one with dollars or safe assets, hold the right licences, and follow the same anti-money-laundering rules as banks. Europe got there first. Under its MiCA rules, stablecoin issuers must be authorised by July 2026 or be delisted from EU exchanges.

For a normal user, regulation is the boring news that matters most. It means the dollar-backed coin you hold is, increasingly, audited, fully reserved, and supervised: closer to a bank balance than a bet.

The one-line version

A stablecoin is money that moves like information: a dollar you can send to anyone, anywhere, in seconds, for almost nothing. The technology underneath has plenty of jargon, but the thing itself is simple, and after a decade of experiments the version that survived is the boring, fully-backed one. That is what makes it useful.

The stablecoin that won is not the clever one. It is the one with real dollars behind it.

Sources

• DefiLlama, stablecoin market cap and supply.
• Chainalysis, adjusted real-economy volume and payment projections.
• CoinMarketCap Academy, gross on-chain volume versus real-economy payments.
• The White House, GENIUS Act fact sheet (July 2025).
• ESMA, Markets in Crypto-Assets (MiCA).