A stablecoin is a cryptocurrency designed to hold a fixed value, almost always one US dollar per coin, by keeping real assets in reserve to back every token in circulation. In other words, it's a digital dollar that moves on a blockchain instead of through a bank.
That simple idea has grown into serious money. Roughly $281 billion worth of stablecoins were in circulation as of March 2026, and Citi analysts project the market could reach $1.9 trillion to $4 trillion by 2030. PayPal issues one. Circle, the company behind USDC, went public on the NYSE in June 2025 and saw its stock jump 168% on day one. Congress even passed a federal law, the GENIUS Act, just to regulate them.
So what is a stablecoin really, and should you trust one with your money? You don't need a finance degree to understand the answer. In this guide, we'll walk through how the dollar peg actually works, the three main types of stablecoins (and why one type failed spectacularly), what people use them for, and the risks the marketing pages skip. If you're brand new to crypto, our primer on the basics of blockchain technology is a helpful companion.
Key takeaways
- A stablecoin is a crypto token pegged to a stable asset, usually the US dollar, with about $281 billion in circulation as of March 2026.
- The two dominant coins, Tether's USDT (roughly $184 billion) and Circle's USDC (roughly $75 billion), together hold over 80% of the market.
- Since July 2025, the GENIUS Act requires US issuers to back coins 1:1 with cash and short-dated Treasuries and publish monthly reserve reports.
- Pegs can break: TerraUSD collapsed in May 2022, erasing about $45 billion, and USDC briefly fell to $0.87 in March 2023.
- Stablecoins are not FDIC insured. Your protection comes from the issuer's reserves and the law, not deposit insurance.
How a Stablecoin Keeps Its Peg
The core mechanism is a swap that works in both directions. When you send a stablecoin issuer one dollar, it creates (or "mints") one new token and hands it to you. When you return the token, the issuer destroys ("burns") it and gives you your dollar back. Supply expands and shrinks exactly in step with the money coming in and out, which is what keeps each token worth $1.
Between those two moments, your dollar doesn't sit idle. Regulated issuers hold reserves in cash and short-term US Treasury bills, as described in Stripe's guide to fiat-backed stablecoins. For every token circulating, an equivalent amount of liquid assets sits in custodial accounts, and the issuer typically keeps the interest those reserves earn.
The peg also gets help from traders. If a stablecoin slips to $0.99 on an exchange, arbitrageurs buy it cheap and redeem it with the issuer for a full dollar, pocketing the difference. That buying pressure pushes the price back to $1. The system works as long as everyone believes redemption is guaranteed, which is why reserves matter so much.
The Three Types of Stablecoins
Not every stablecoin holds dollars in a bank. There are three main designs, and their track records differ dramatically.
Fiat-backed stablecoins
These are backed by traditional money and equivalents, held by a custodian. It's the simplest model and the one US law now blesses. The giants are all fiat-backed: Tether's USDT at roughly $184 billion and Circle's USDC near $75 billion, plus PayPal's PYUSD at around $2.8 billion. Together, USDT and USDC control more than 80% of the market.
Crypto-collateralized stablecoins
Coins like DAI lock up other cryptocurrencies in smart contracts as collateral instead of holding dollars. Because that collateral is volatile, these systems overcollateralize: you might lock $150 of ether to mint $100 of stablecoin. If the collateral's value falls too far, the position is automatically liquidated to protect the peg. It's clever, decentralized, and more complex, which means more ways to break. Our guide to DeFi and blockchain covers this world in depth.
Algorithmic stablecoins: the failed experiment
Algorithmic stablecoins tried to hold a peg with no real collateral at all, using code that expanded and contracted supply against a sister token. The idea died in practice in May 2022, when TerraUSD (UST) lost its peg and entered a death spiral with its sister coin LUNA. UST fell to about 10 cents, LUNA went to virtually zero, and roughly $45 billion in market value evaporated within a week. US law now effectively keeps this design out of the regulated market.
Reserves, Audits, and the New Rulebook
For years, the biggest question in the stablecoin market was simple: is the money really there? Tether paid $41 million to settle CFTC charges in 2021 over misstatements about its backing, and disclosure practices varied wildly across issuers.
The GENIUS Act, signed on July 18, 2025, changed that for US coins. It's the first federal stablecoin law, and it requires permitted issuers to back every coin 1:1 with cash and short-dated US Treasuries, publish monthly reserve disclosures, and honor redemption at par, according to Paul Hastings' guide to the law. Issuers can't pay you interest on your coins, and only licensed, supervised entities may issue at all. Regulators spent early 2026 writing the detailed rules, including a proposed OCC rule published in March 2026.
We break down the whole law, including what it means for your redemption rights, in our companion piece on the GENIUS Act stablecoin rules.
What Is a Stablecoin Used For in Real Life?
A digital dollar is only interesting if it does something a regular dollar can't. Three uses dominate.
Payments and settlement
Stablecoins settle in seconds to minutes, around the clock, including weekends and holidays. Card networks and processors have leaned in: Visa, Mastercard, and Stripe all run stablecoin settlement programs. In the first half of 2026, USDC alone accounted for about 70% of adjusted stablecoin transaction volume, much of it business payments rather than crypto trading.
Remittances and cross-border transfers
Consider Maria, a nurse in Houston who sends $400 a month to her mother in Manila. Through a traditional remittance service, she'd typically give up $20 to $25 in fees and wait a day or more. Using a stablecoin app, she converts dollars to USDC, sends it in minutes, and her mother cashes out in pesos through a local exchange, often paying a few dollars total. Maria's story is illustrative, but the pattern is real; it's why remittance corridors are among the fastest-growing stablecoin use cases. For more on the plumbing, see our guide to the technologies driving cross-border payments.
Trading and a parking spot for crypto money
On exchanges, stablecoins are the cash register. Traders sell volatile coins into USDT or USDC to lock in gains without leaving crypto, then redeploy later. Stablecoins are also the base currency for most lending and yield activity in DeFi.
The Risks: When Stablecoins Stop Being Stable
The name is a promise, not a guarantee. Every major risk that has hurt stablecoin holders traces back to one question: can the issuer actually give everyone their dollar back at the same time?
Depeg history you should know
Terra's collapse was the catastrophic case, but even the best-run coins have wobbled. In March 2023, Circle disclosed that $3.3 billion of USDC's reserves were stuck at the failed Silicon Valley Bank, about 8% of the total. USDC traded as low as roughly $0.87 that weekend before regulators guaranteed SVB's deposits and the peg snapped back.
Consider Devon, a graphic designer who kept $12,000 of freelance savings in USDC that March. Watching his "stable" balance shrink to about $10,500 on paper over a weekend, he faced a choice: sell at a loss or trust the reserves. He held, and by Monday his balance was whole. The lesson isn't that it worked out; it's that a stablecoin can hand you a bank-run weekend with no FDIC insurance behind it.
What protects you, and what doesn't
Stablecoins are not bank deposits, and holders are not FDIC insured. Your protection is the quality of the reserves, the issuer's regulation, and, since the GENIUS Act, a legal priority claim on reserves if an issuer fails. You also carry ordinary crypto risks: losing wallet keys, sending to a wrong address, and platform hacks. Our overview of the risks of cryptocurrency investing applies here too.
How Stablecoins Differ From Other Crypto and Bank Dollars
Bitcoin is designed to float freely; a stablecoin is designed to never move. That single difference changes everything about how each is used. Here's the side-by-side.
| Feature | Stablecoin (e.g., USDC) | Bitcoin | Dollars in a bank |
|---|---|---|---|
| Price target | Fixed at $1 | Floats with the market | Fixed at $1 |
| What backs it | Cash and short-term Treasuries | Nothing; market demand | Bank's balance sheet |
| Insurance | None (reserve rules instead) | None | FDIC up to $250,000 |
| Transfer hours | 24/7/365 | 24/7/365 | Mostly business hours |
| Pays you interest | No (banned by the GENIUS Act) | No | Often yes |
| Main job | Payments, trading, transfers | Investment, store of value | Saving and spending |
One more cousin worth naming: a central bank digital currency, or CBDC, is a digital dollar issued by the government itself rather than a private company. The US has moved firmly against that model. The differences matter, and we compare them head-to-head in our guide to stablecoins vs CBDCs.
Where Stablecoins Go From Here
A stablecoin, is a claim on a dollar dressed in blockchain clothing. The mint-and-burn cycle keeps the peg, reserves make the promise credible, and federal law now forces issuers to prove it monthly. Used well, stablecoins make payments faster and cheaper, especially across borders. Used carelessly, they expose you to depeg risk and issuer failure with no deposit insurance to catch you.
The next few years will decide how big this gets. Citi's analysts see a multi-trillion-dollar market by 2030, banks and fintechs are lining up to issue coins under the new rules, and regulators are finishing the fine print through 2026. If stablecoins do become an everyday payment rail, most people won't even notice they're using one; the technology will hide behind familiar apps. To understand the rulebook shaping all of it, start with our breakdown of the GENIUS Act stablecoin regulations.
Frequently Asked Questions
What is a stablecoin in simple terms?
It's a cryptocurrency built to always be worth a fixed amount, usually $1. The company that issues it holds real dollars and US Treasuries in reserve, so every token can be traded back for a dollar. Think of it as a digital receipt for money the issuer is holding on your behalf.
Can a stablecoin lose its value?
Yes. TerraUSD fell from $1 to about 10 cents in May 2022 and never recovered, and even USDC briefly traded near $0.87 in March 2023 during the Silicon Valley Bank failure. Well-reserved coins have always recovered their peg quickly, but "stable" describes the goal, not a guarantee.
Are stablecoins FDIC insured?
No. FDIC insurance covers bank deposits, not stablecoin holdings. Under the GENIUS Act, US issuers must hold 1:1 reserves and holders get priority claims on those reserves if the issuer fails, but that's a legal process, not instant insurance.
Do stablecoins pay interest?
Regulated US payment stablecoins can't pay holders interest or yield; the GENIUS Act forbids it. Issuers keep the interest earned on reserves. Some exchanges offer separate "rewards" programs on stablecoin balances, but those come from the platform, carry their own risks, and are a live regulatory controversy.