The stablecoin market: size, structure and risks
Dollar tokens are the plumbing of crypto. Here's how much there is, who issues it, and where it can break.
Stablecoins are crypto tokens designed to stay at $1. Their total supply was about $300 billion in late October 2026 according to DefiLlama, below a record of about $322 billion in May 2026. Two issuers dominate: Tether's USDT (about $178 billion) and Circle's USDC (about $71 billion). Supply grows when firms deposit dollars to mint new tokens and shrinks when tokens are redeemed.
How big the stablecoin market is
According to DefiLlama, which adds up the supply of every tracked stablecoin across blockchains, the total was $300.4 billion on October 25, 2026. The record was about $322 billion on May 26, 2026; supply drifted down over the summer and autumn, while crypto prices were also falling. For comparison, the total was close to $200 billion in late 2024.
| Stablecoin | Type | Supply (DefiLlama, Nov 4, 2026) |
|---|---|---|
| Tether (USDT) | Backed by reserves held by the issuer | $177.8 billion |
| USD Coin (USDC) | Backed by reserves held by the issuer | $71.3 billion |
| Sky Dollar (USDS) | Crypto-collateralized, governed on-chain | $6.5 billion |
| Dai (DAI) | Crypto-collateralized, governed on-chain | $4.7 billion |
Tether's own September 30, 2026 attestation showed about $183.5 billion of USDT outstanding; DefiLlama counts circulating supply across chains, so the figures differ.
The two largest, USDT and USDC, make up roughly four-fifths of the total. Their live market caps:
| Stablecoin | Market cap now | Price now |
|---|---|---|
| Tether (USDT) | — | — |
| USD Coin (USDC) | — | — |
How supply grows and shrinks
For reserve-backed coins, supply changes through minting and redemption. A large customer (usually an exchange or trading firm that has passed the issuer's checks) sends dollars and receives new tokens; when they redeem, the tokens are destroyed and the dollars returned. Ordinary users mostly buy and sell stablecoins on exchanges instead, and that trading keeps the price near $1: if USDC traded at $0.99, approved firms could buy it cheap and redeem it for $1.
Crypto-collateralized coins such as DAI and USDS are minted when users lock up more crypto than they borrow; see decentralized stablecoins.
Where stablecoins live and what they're used for
- Trading: they're the main "cash" on crypto exchanges and the other side of most trading pairs.
- DeFi: they're what most people lend, borrow and pool in DeFi apps.
- Payments and savings in dollars, especially in countries with unstable currencies, and for cross-border transfers.
- Chains: the same coin is issued on many blockchains. Most USDT sits on Tron and Ethereum; Ethereum and its layer 2 networks hold the largest share of all stablecoins.
Because supply only grows when someone deposits dollars, analysts watch total stablecoin supply as a rough gauge of money available inside crypto. It's a loose indicator, not a price signal: supply can grow because of payments use, or shrink because one issuer loses market share.
Rules in the US
The GENIUS Act, signed into US law on July 18, 2025, set up a federal framework for "payment stablecoins": issuers must hold reserves of at least one dollar for every token, in cash, bank deposits, short-term Treasuries and similar assets, publish their reserves monthly, and give holders priority in an issuer's insolvency. Regulators are still writing the detailed rules. More in what is a stablecoin.
Risks in the structure
- Concentration: two private companies issue most of the supply. Problems at one would ripple through every exchange and DeFi app.
- Depegs: USDC fell to about $0.88 in March 2023 when $3.3 billion of its reserves were stuck at the failed Silicon Valley Bank, before recovering. The algorithmic stablecoin TerraUSD (UST) collapsed to near zero in May 2022.
- Freezes: issuers can freeze tokens at specific addresses, usually at law enforcement's request.
- Not deposits: stablecoins aren't bank accounts and aren't covered by FDIC insurance.
Related reading: USDT vs. USDC vs. DAI: how the big stablecoins differ · Crypto regulation in the United States
Frequently asked questions
How big is the stablecoin market?
About $300 billion in late October 2026, according to DefiLlama, down from a record of about $322 billion in May 2026.
Which stablecoin is the largest?
Tether's USDT, with about $178 billion of supply in early November 2026, followed by Circle's USDC at about $71 billion (DefiLlama).
Why does stablecoin supply matter?
New stablecoins are created when dollars come in, so total supply is a rough gauge of money parked inside crypto. It's a loose indicator and doesn't predict prices.
Can a stablecoin lose its peg?
Yes. USDC briefly fell to about $0.88 in March 2023, and TerraUSD collapsed permanently in 2022. A stablecoin is only as good as its backing and its issuer.
Where to next
Sources
- Stablecoins dashboard and API (DefiLlama)
- DeFi stablecoin deposits hit $24 billion as total market cap slips to $300 billion (OneBullEx, citing DefiLlama, October 25, 2026)
- Stablecoin market reaches record $322B (Crypto Briefing, citing DefiLlama for May 26, 2026)
- Tether transparency (Tether)
- USDC transparency (Circle)
- GENIUS Act, S.1582, 119th Congress (Congress.gov)
- Stablecoin USDC breaks dollar peg after firm reveals it has $3.3 billion in SVB exposure (CNBC, March 11, 2023)
Written for beginners and checked against the sources listed. Last reviewed November 5, 2026. This page is educational and is not financial, tax or legal advice. How we write and check pages.