A cryptocurrency designed to maintain a stable price by pegging to a fiat currency (usually USD), gold, or an algorithm.
A stablecoin is a cryptocurrency designed to maintain a stable value, typically pegged 1:1 to a fiat currency like the US dollar. Stablecoins solve crypto's volatility problem, enabling reliable pricing, payments, savings, and DeFi participation. The three main types are: fiat-backed (USDT, USDC — backed by dollar reserves held by the issuer), crypto-backed (DAI — overcollateralized with crypto assets), and algorithmic (maintaining peg through mint/burn mechanisms and arbitrage incentives). USDT and USDC together account for over $150 billion in supply and are the most-used tokens in crypto for trading pairs, DeFi deposits, remittances, and savings in countries with unstable local currencies. Stablecoins have become systemically important in both crypto and increasingly in traditional payments. The Terra/UST algorithmic stablecoin collapse in May 2022, which wiped out $40 billion, demonstrated the risks of under-collateralized designs.
Stablecoins are cryptocurrencies designed to maintain a 1:1 peg with a reference asset, typically the US dollar, providing the utility of crypto (instant transfers, DeFi participation) without the volatility. They've become the most widely used crypto asset class, with combined market cap exceeding $130 billion and daily transfer volumes rivaling traditional payment networks. Three main models exist: fiat-backed (USDT, USDC — each token backed by cash/treasuries in reserve), crypto-backed (DAI — over-collateralized with ETH and other crypto), and algorithmic (which use market mechanisms to maintain pegs — a model discredited by Terra UST's collapse in 2022 that destroyed $40+ billion). USDT dominates with ~70% market share but faces transparency concerns about its reserves. USDC, issued by Circle, is more transparent with regular attestations. Stablecoins face increasing regulatory scrutiny, with proposals for reserve requirements, registration, and operational standards in major jurisdictions.
USDT (Tether) processes more daily transaction volume than Visa across the Tron and Ethereum networks combined — making it arguably the most-used digital dollar in the world, particularly in emerging markets.
Yes — USDC briefly depegged to $0.87 in March 2023 when its reserve bank (Silicon Valley Bank) failed. Terra UST collapsed entirely in May 2022. Fiat-backed stablecoins depend on reserve integrity; algorithmic stablecoins depend on market mechanism reliability. USDT and USDC have maintained their pegs through most conditions, but zero risk doesn't exist.