A stablecoin is a cryptocurrency designed to keep a stable price, usually pegged 1:1 to a traditional currency like the US dollar (or gold, or another asset). Unlike Bitcoin or Ethereum, whose prices swing with the market, a stablecoin aims to hold roughly $1.00 at all times.
The main types:
- Fiat-collateralized — backed by real dollars held in reserve (e.g. USDT by Tether, USDC by Circle). Each token is meant to be redeemable for $1 of actual reserve. Most popular and most stable in practice.
- Crypto-collateralized — backed by other crypto assets locked as collateral, over-collateralized to absorb price swings (e.g. DAI, backed by a mix of crypto held in smart contracts).
- Algorithmic — not backed by reserves at all; a protocol tries to expand/contract token supply or use arbitrage incentives to hold the peg (e.g. UST, which famously collapsed in 2022 — this is the riskiest category).
Why people use them:
- Store of value without volatility — park money in crypto without price risk.
- Trading on exchanges — most crypto pairs are quoted against USDT/USDC instead of dollars.
- Earning yield — lending them out in DeFi for interest.
- Fast, cheap transfers — moving value across borders without banks.
The key thing to watch is the backing: a fiat-backed stablecoin is only as safe as the real reserves behind it and their transparency, while an algorithmic one carries real depeg risk.
Want me to check the current price, market cap, and rankings of a specific one — say USDT or USDC? I can pull live data on whichever you're curious about.