What is a Stablecoin? Definition, Purpose & Distinction from Other Cryptocurrencies
A clear definition of stablecoins, why they were invented, and how they differ from volatile cryptocurrencies.
Key Takeaways
- A stablecoin is a crypto asset designed to maintain a stable value against a reference asset.
- Unlike Bitcoin or Ether, stablecoins prioritize price stability over appreciation potential.
- The "stable" peg is maintained through reserves, collateral, or algorithmic mechanisms.
Defining a Stablecoin
A stablecoin is a type of cryptographic asset that is designed to maintain a stable market price—typically pegged 1:1 to a fiat currency such as the US Dollar, Euro, or British Pound—through some form of backing or algorithmic mechanism.
The Volatility Problem
Bitcoin's price can swing 20% in a single day. Ether's value in 2022 fell from over $4,000 to under $1,000 in a year. This volatility makes traditional cryptocurrencies unsuitable as a unit of account (pricing goods), medium of exchange (paying wages), or store of value (saving). Stablecoins were invented to solve this problem.
What Makes a Coin "Stable"?
A stablecoin achieves price stability through one or more mechanisms:
| Mechanism | Example | How it Works |
|---|---|---|
| Fiat reserves | USDC, USDT | For every coin issued, $1 sits in a bank or treasury |
| Crypto collateral | DAI | Over-collateralized crypto assets back each token |
| Commodity backing | PAXG | Each token represents physical gold held in a vault |
| Algorithmic | (legacy UST) | Smart contracts expand/contract supply to maintain peg |
Not All Stablecoins Are Equal
The word "stablecoin" encompasses very different risk profiles. A fully-reserved, audited stablecoin like USDC is fundamentally different from an algorithmic stablecoin like TerraUSD—which collapsed in May 2022, wiping out over $40 billion in value in 72 hours.
Regulators around the world are now drawing sharp distinctions between these types, and understanding those distinctions is essential for anyone working in finance or policy.