Term
Stablecoin
A stablecoin is a cryptocurrency whose price is designed to track a stable reference — usually the US dollar — through mechanisms like fiat reserves (USDT, USDC), crypto collateral (DAI), or algorithmic supply control.
A stablecoin is a cryptocurrency designed to hold a stable price, typically 1:1 with the US dollar. The three major mechanisms are fiat-collateralized (Tether's USDT, Circle's USDC — each token backed by dollar reserves held by the issuer), crypto-collateralized (MakerDAO's DAI — each token overcollateralized by locked ETH and other assets), and algorithmic (historically Terra's UST — supply managed by algorithm, and collapsed in 2022).
The dominant stablecoins by volume are USDT and USDC. USDT-TRC20 (on TRON) is the most-used stablecoin globally for peer-to-peer transfers because of TRON's cheap and fast rails. USDT-ERC20 (on Ethereum) is the most-used in Ethereum DeFi. USDC is popular where transparency and regulated backing matter — Circle publishes monthly attestations of USDC reserves.
Every fiat-collateralized stablecoin issuer has the technical ability to freeze specific addresses. Tether has done so on thousands of addresses (mostly linked to hacks or sanctioned entities); Circle does so under court order. This "issuer freeze risk" is the main non-market risk of holding a stablecoin — a cold-storage USDT balance can still be frozen at the token contract level. See USDT vs USDC freeze risk for the practical comparison.
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