Beginner Guide
What is a Stablecoin?
A stablecoin is a crypto token designed to keep a stable value — usually pegged 1:1 to the US dollar. They're how the dollar moves at internet speed: 24/7, globally, with no bank involved.
Why stablecoins exist
Bitcoin and Ethereum are volatile — the price can swing 10% in a day. That's terrible for paying rent, paying employees, or holding savings. Stablecoins solve this by giving you a tokenized dollar (or euro, or other currency) that lives on a blockchain. You get crypto's speed and global reach with the dollar's stability.
Stablecoins are the most-used product in crypto. They settle hundreds of billions of dollars in payments and trades every month, and they're the backbone of most DeFi activity.
The three flavors
Fiat-backed stablecoins (USDC by Circle, USDT by Tether) are the simplest. The issuer holds dollars (or short-term Treasuries) in a bank account, and mints one token per dollar. You can theoretically redeem one token for one dollar with the issuer.
Crypto-backed stablecoins (DAI by MakerDAO, GHO by Aave) are over-collateralized by other crypto — typically ETH and other assets locked in smart contracts. If collateral value drops below a threshold, the system automatically liquidates positions to maintain the peg.
Algorithmic stablecoins try to maintain the peg purely through code and incentives, with little or no collateral. They have a terrible track record — the most famous example, TerraUSD (UST), collapsed from $1 to near zero in a few days in May 2022, vaporizing $40 billion.
Top stablecoins compared
| Stablecoin | Type | Notes |
|---|---|---|
| USDC | Fiat-backed (Circle) | Most regulated, monthly attestations, US-based |
| USDT (Tether) | Fiat-backed (Tether) | Largest by supply, ongoing transparency debate |
| DAI | Crypto-backed (MakerDAO) | Decentralized, over-collateralized by ETH and others |
| PYUSD | Fiat-backed (PayPal) | Newer, integrated with PayPal/Venmo |
| FDUSD | Fiat-backed (First Digital) | Asia-focused, growing on Binance |
| GHO | Crypto-backed (Aave) | Decentralized, minted via Aave loans |
How people actually use stablecoins
- Send money internationally — Move USDC from New York to Manila in seconds for cents — vs days and high fees via banks.
- Earn yield — Lend stablecoins on Aave or Morpho for 3-8% APY — much better than most savings accounts.
- Park crypto profits — Sell volatile assets into stablecoins without leaving the blockchain.
- Pay employees & contractors — Many crypto-native companies pay salaries in USDC.
- Trade without fiat — Most DEX trading pairs use stablecoins. Easier than wiring dollars in and out.
- Inflation hedge in unstable economies — Citizens of Argentina, Turkey, Nigeria use stablecoins to escape collapsing local currencies.
Frequently Asked Questions
Are stablecoins safe?
The major fiat-backed stablecoins (USDC, USDT) have been reliable for years, but they carry counterparty risk — if the issuer fails, the peg can break. USDC briefly de-pegged in March 2023 when Silicon Valley Bank failed. Algorithmic stablecoins have a much worse safety record.
Do stablecoins earn interest?
Just holding them doesn't, but you can earn yield by lending them on platforms like Aave, Morpho, or Coinbase. Sustainable yields are 3-8%; anything much higher carries proportionally higher risk.
What's the difference between USDC and USDT?
USDC (Circle) is more regulated and US-based, with monthly attestations. USDT (Tether) is larger and more globally used but has faced ongoing questions about its reserves. Both work; preferences vary by region and use case.
Can a stablecoin lose its peg?
Yes — and they have. UST collapsed entirely. USDC briefly traded at $0.87 during the SVB bank crisis. DAI has had brief de-pegs. Stable doesn't mean risk-free.
Are stablecoins regulated?
Increasingly. The EU's MiCA framework and US legislation in 2025 have begun to formalize how fiat-backed stablecoins must be reserved and audited.