Glossary

Stablecoin

Plain-language definition Crypto glossary

Key takeaways

A stablecoin is a cryptocurrency designed to hold a steady value, usually by pegging to a fiat currency such as the US dollar, giving users a way to hold value on-chain without large price swings.
There are three broad designs: fiat-backed (cash and reserves), crypto-collateralized (over-collateralized with volatile crypto), and algorithmic (supply rules and incentives, historically the most fragile).
Stablecoins are the main settlement layer of crypto trading and a backbone of DeFi, with key risks being reserve quality and whether each token can actually be redeemed.

Definition

A stablecoin is a cryptocurrency designed to hold a steady value, usually by pegging to a fiat currency such as the US dollar. Stablecoins give traders and users a way to hold value on-chain without the price swings of assets like Bitcoin.

How it works

There are three broad designs. Fiat-backed stablecoins hold cash and short-term reserves and issue one token per dollar held. Crypto-collateralized stablecoins lock up more than a dollar of volatile crypto for each token to absorb price moves. Algorithmic stablecoins try to hold the peg through supply rules and incentives rather than reserves, a design that has historically proven the most fragile.

Why it matters

Stablecoins are the main settlement layer of crypto trading, the backbone of DeFi lending, and an increasingly common rail for cross-border payments. Their key risks are reserve quality and redemption — whether each token can really be exchanged for the value it claims.

Example

USDC and USDT are large fiat-backed stablecoins; DAI is a well-known crypto-collateralized stablecoin.

FAQ

Frequently asked questions

How does a stablecoin stay close to its peg?

It depends on the design. Fiat-backed coins hold cash and short-term reserves and issue one token per dollar held, crypto-collateralized coins lock up more than a dollar of volatile crypto per token, and algorithmic coins use supply rules and incentives rather than reserves.

Are all stablecoins equally safe?

No. Algorithmic designs that rely on supply rules instead of reserves have historically proven the most fragile, while backed designs depend heavily on the quality of their reserves. The key risks are reserve quality and whether each token can actually be redeemed for its stated value.

Why are stablecoins so widely used in crypto?

They are the main settlement layer of crypto trading, the backbone of DeFi lending, and an increasingly common rail for cross-border payments. They let traders and users hold value on-chain without the volatility of assets like Bitcoin. This is educational information, not financial advice.