A stablecoin is crypto pegged to the dollar: 1 token ≈ $1. USDT is the largest and most widely accepted; USDC has the stronger reputation for compliance and transparency. For everyday trading both work — the differences matter for large or long-term holdings.
Coin prices swing hard, so traders need somewhere to pause: sell BTC into a stablecoin and you've locked in dollar value inside the market, without cashing out to a bank. Buying back in takes seconds. Stablecoins are the cash layer of the whole system — which is why most people's first purchase is the stablecoin itself; see How to Buy USDT.
| USDT (Tether) | USDC | |
|---|---|---|
| Issuer | Tether | Circle |
| Scale | Largest stablecoin by a wide margin | Second largest, roughly half USDT's scale |
| Reserve disclosure | Publishes periodic reserve reports; reserves mostly short-term US Treasuries | Regular attestations/audits; reserves in cash and short-term Treasuries; stronger transparency reputation |
| Regulatory posture | Offshore-leaning; treatment varies by jurisdiction | US compliance-first; actively licensed and regulator-facing |
| Where it's used | Everywhere: exchanges, chains, P2P — the deepest liquidity | Stronger share on regulated venues, DeFi and institutional flows |
| Shared risk | Both are centralized, company-issued tokens: the issuer can freeze addresses, and reserve trouble can break the peg for either | |
One-line summary: for pure usability, USDT; for transparency and compliance, USDC. In calm markets the distinction is barely noticeable. It shows up in stress: when an issuer hits the headlines, its token gets sold first and trades at a discount.
A stablecoin trading away from $1 is called a depeg, and history has real examples: the algorithmic UST collapsed to zero in 2022 and dragged the market down with it; even USDC briefly traded under $0.90 in 2023 when a bank holding part of its reserves failed, before recovering. Two lessons: algorithmic and opaque designs carry the highest risk, and no single stablecoin deserves your entire balance. Large holders split across USDT and USDC and keep an eye on issuer news.
Yes. Small wobbles (0.99–1.01) are routine, and extreme events have produced major depegs. The peg is a company's promise of full redemption — not a law of physics.
No. USDT is issued by Tether and USDC by Circle — both private companies, which is precisely where issuer risk comes from.
Not strictly, but it's the recommended route: most pairs are quoted in USDT, and going through it gets you better prices and depth. Full flow in How to Buy Bitcoin.
Exchange earn yields come from lending and platform subsidies, and you carry both platform and issuer counterparty risk. Rates far above market are a prompt to run the scam checklist first and discuss returns second.