What are stablecoins?

Stablecoins are cryptocurrencies designed to maintain a stable value relative to a reference asset, typically the US dollar. The total stablecoin supply exceeds $150 billion, making them the most widely used tokens in the crypto ecosystem for trading, payments, and as a store of value within decentralized finance. The two dominant stablecoins are Tether (USDT) with approximately $100 billion in circulation and USD Coin (USDC) with approximately $30 billion.

Stablecoins come in several forms. Fiat-collateralized stablecoins (USDT, USDC, BUSD) are backed by reserves of cash, short-term Treasuries, and other liquid assets held by the issuer. For every token in circulation, the issuer claims to hold corresponding dollar-denominated assets. Crypto-collateralized stablecoins (DAI) are backed by crypto assets deposited in smart contracts, with overcollateralization to absorb price volatility. Algorithmic stablecoins attempted to maintain their peg through supply-adjustment mechanisms without traditional collateral; the most notable, TerraUSD, collapsed spectacularly in May 2022, destroying $60 billion in value.

The macro significance of stablecoins extends beyond crypto. Tether and USDC hold tens of billions in short-term US Treasury bills, making stablecoin issuers meaningful participants in the Treasury market. Stablecoin flows serve as a real-time indicator of capital entering or leaving the crypto ecosystem: growing stablecoin supply generally correlates with capital inflows and bullish crypto conditions, while shrinking supply signals outflows and bearish conditions.

Regulatory attention on stablecoins has intensified because they represent a form of private money creation that exists largely outside the banking regulatory framework. Concerns include reserve adequacy and transparency (are the claimed assets really there?), run risk (can all holders redeem simultaneously?), and monetary sovereignty implications (are stablecoins creating a parallel dollar system?). Proposed legislation in the US would require stablecoin issuers to hold high-quality liquid assets and submit to bank-like supervision, potentially institutionalizing stablecoins as a regulated part of the financial system.