Stablecoins are cryptocurrencies designed to keep a stable price, usually pegged 1:1 to the US dollar. They combine the speed and global reach of crypto with the price stability of traditional money, which is why they’ve become the most widely used tokens for trading, payments and DeFi.
Key takeaways
- Most stablecoins track the US dollar, though euro and gold-backed versions exist.
- Three main types: fiat-backed, crypto-collateralized and algorithmic.
- The largest — USDT (Tether) and USDC (Circle) — are backed by cash and short-term government debt.
- Stablecoins can «depeg» — they’re stable by design, not by guarantee.
Why stablecoins exist
Bitcoin and other cryptocurrencies are volatile, which makes them awkward for everyday payments, pricing or saving. Stablecoins solve this: you can move dollars around the world in minutes, settle trades on exchanges, or use DeFi apps — without exposure to crypto price swings.
The three types of stablecoins
| Type | How it holds the peg | Examples | Main risk |
|---|---|---|---|
| Fiat-backed | Issuer holds cash and short-term government bonds; tokens redeemable 1:1 | USDT, USDC | Trust in the issuer, its reserves and its banks |
| Crypto-collateralized | Over-collateralized with crypto locked in smart contracts | DAI and its successor USDS | Collateral crashes, smart contract bugs |
| Algorithmic | Supply adjusted by code and incentives, with little or no collateral | TerraUSD (UST) — collapsed in 2022 | «Death spiral» when confidence breaks |
Fiat-backed stablecoins
A company issues one token for every dollar (or dollar-equivalent asset) it holds. Approved customers can redeem tokens for dollars, and that redemption promise — plus traders arbitraging any price gaps — keeps the price near $1. Tether (USDT), launched in 2014, is the largest stablecoin by market cap. USD Coin (USDC), issued by Circle, publishes regular reserve attestations.
Crypto-collateralized stablecoins
Users lock crypto worth more than the stablecoins they mint — for example, $150 of ETH to mint 100 tokens. If collateral value falls too far, it’s liquidated to keep the system solvent. These are more decentralized but more complex.
Algorithmic stablecoins
These try to maintain the peg through code alone, often using a second token to absorb volatility. In May 2022, TerraUSD lost its peg and collapsed within days, wiping out tens of billions of dollars in value — a lesson in why «stable» isn’t the same as «safe».
What causes a depeg?
- Doubts about reserves: if holders fear the backing isn’t there, they rush to sell.
- Banking problems: in March 2023, USDC briefly fell below $0.90 after Circle disclosed exposure to the failed Silicon Valley Bank, before recovering.
- Collateral crashes: for crypto-backed coins, rapid price drops can strain the system.
- Design failure: algorithmic models can break under stress.
How stablecoins are used
- Trading: the main quote currency on crypto exchanges.
- Payments and remittances: fast, low-cost cross-border transfers, especially on Layer 2 networks and other low-fee chains.
- DeFi: lending, borrowing and providing liquidity.
- Dollar access: people in countries with unstable currencies use them to hold dollars.
Stablecoin risks checklist
- Who issues it, and are reserves independently attested or audited?
- Is it regulated in any jurisdiction?
- Can the issuer freeze tokens? (Many fiat-backed issuers can.)
- Which blockchain are you holding it on, and is that the official version?
- Does the yield offered on it make sense, or is it too good to be true?
Frequently asked questions
Are stablecoins safe?
They’re generally less volatile than other crypto, but they carry issuer, regulatory and technical risks. They’re usually not covered by deposit insurance.
Is USDT or USDC better?
Both are widely used. They differ in issuer, reserve disclosures, regulatory approach and which platforms support them. Many users hold some of each to diversify issuer risk.
Can you earn interest on stablecoins?
Yes, through lending protocols or some platforms. The yield comes from borrowers or the issuer’s reserve income — and always carries counterparty or smart contract risk.
