Strip away the charts and the memes and most of crypto runs on a boring workhorse: the stablecoin. A token designed to hold a fixed value — almost always one dollar — stablecoins are the ground everything else is played on. They're the quote asset for trading pairs, the collateral in DeFi, and increasingly a genuine payment rail for cross-border transfers.
Three ways to hold a peg
Fiat-backed
USDT and USDC dominate. The model is simple: for every token issued, the issuer holds roughly a dollar of reserves, mostly short-term government debt. The peg holds because tokens are redeemable for real dollars. Your trust assumption is the issuer — that reserves are real, liquid, attestable, and that banking access stays open.
Crypto-backed
DAI-style stablecoins lock more than a dollar of crypto collateral for every dollar issued, often a fifty percent buffer or more. Overcollateralization absorbs volatility and automated liquidations defend the peg. Trust shifts from a company to smart-contract code and collateral quality.
Algorithmic
The ghost story of the sector. Algorithmic designs tried to hold a peg with incentives and a sister token instead of collateral. Terra's UST — an eighteen-billion-dollar stablecoin — collapsed to nearly nothing in May 2022 and erased roughly forty billion dollars of value on the way down. The lesson stuck: a peg supported only by reflexive demand breaks exactly when you need it most.
Regulation showed up
Stablecoins have moved from gray zone to legislation. The US GENIUS Act created a federal framework for payment stablecoins — reserve requirements, disclosures, licensed issuers — and Europe's MiCA regime did something similar across the EU. For users this generally means clearer redemption rights from regulated issuers. For the industry it means stablecoins are being wired into mainstream payments rather than walled off from them.
Why traders watch supply
Total stablecoin supply is one of the cleanest liquidity reads in crypto.
- Rising supply means new dollars entering the market — capital that can rotate into BTC, ETH and everything below. Sustained growth has preceded most major rallies.
- Falling supply means redemptions. Money is leaving entirely, not rotating. That's a materially different signal from people simply selling coins for stables.
- Flows to exchanges often front-run buying; flows into DeFi instead signal yield-seeking rather than risk appetite.
Practical safety
Whether or not you ever trade, you'll use stablecoins — to park profits, move between chains, or earn yield. Spread across more than one issuer if you hold size. Treat any yield above roughly the risk-free rate as payment for a risk you should be able to name out loud. And remember that a stablecoin sitting in a lending protocol is not the same asset as one in your own wallet.