Stablecoin

A stablecoin is a cryptocurrency designed to hold a steady value, most commonly one unit of a fiat currency such as the US dollar. Instead of fluctuating freely like Bitcoin or Ether, a stablecoin uses some stabilizing mechanism — reserves of real assets, crypto collateral, or an algorithm — to keep its market price close to its target, called the peg.

Stablecoins solve a practical problem: crypto markets run around the clock, but traders and businesses often want to hold value in dollars without leaving the blockchain. For example, a trader who sells Ether on a decentralized exchange can receive USDC, a dollar-pegged stablecoin, and hold it on-chain until they want to buy back in, without ever touching a bank account. Stablecoins are also widely used for cross-border transfers, payments, and as the quote currency on most crypto trading pairs.

A common misconception is that all stablecoins are equally safe; in reality their risk depends entirely on how the peg is maintained, and history includes several stablecoins that lost their peg permanently. The main designs are fiat-backed (reserves held by a company), crypto-backed (overcollateralized with other crypto), and algorithmic (supply adjustments with little or no collateral), each with a different trust model and failure mode. Understanding which type you hold — and who, if anyone, promises to redeem it — is the first step in judging its risk.