USDT vs USDC vs DAI vs FDUSD — the four stablecoins compared on what matters
USDT, USDC, DAI and FDUSD together hold $228bn — but they differ on reserves, freeze risk, MiCA status and on-chain availability. A side-by-side that actually compares what matters.
September 2026 Update: Market data in September 2026 shows USDT still the largest of the four at roughly $183.3 billion market cap and 60.62% stablecoin dominance, ahead of USDC at about $73.8 billion (24.40% dominance) and DAI at about $4.58 billion (a 1.51% volume-to-market-cap ratio); FDUSD remains far smaller, with CoinGecko showing a $0.9993 price and $228,266,051 in 24-hour trading volume on 19 September 2026. On regulation, the US GENIUS Act framework now requires payment stablecoins to be backed one-to-one by high-quality liquid reserves, with monthly public disclosures and independent examination, and takes effect on 18 January 2027 unless final rules arrive sooner. In Europe, USDT, DAI and FDUSD were still listed as lacking MiCA authorisation as of May 2026, even though MiCA’s stablecoin provisions have been fully applicable since 30 December 2024. USDC’s edge remains its compliance profile and reach — about $77.6 billion circulating across 20+ chains via CCTP, regulated under New York DFS plus an EU EMI licence. The figures and analysis below have been updated accordingly.
As of September 2026 the four largest dollar stablecoins — Tether USD, USD Coin, Dai, and First Digital USD — remain the anchors of the dollar-pegged stablecoin market, led by Tether’s roughly $183.3 billion in circulating supply and 60.62% market-cap dominance. They are routinely treated as interchangeable on exchange interfaces and DeFi front-ends, which is convenient and wrong. USDT, USDC, DAI and FDUSD differ on reserve composition, custodian, freeze powers, MiCA authorisation, on-chain availability, redemption mechanics and counterparty risk. Choosing between them is not a branding decision; it is a treasury decision, and over time the wrong choice has cost users between 50 basis points and 100% of principal depending on the failure mode.
What is at stake is the operational reliability of the unit you actually hold. A trader holding USDT on a centralised exchange faces different risk than a DAO treasury holding USDC at a smart-contract vault, which faces different risk than a DeFi user holding DAI in a non-custodial wallet. In practice that means each token is fit for some purposes and unfit for others. The comparison below is built from each issuer’s most recent attestation, MiCA filings through mid-2026, and on-chain data from DefiLlama and Etherscan, refreshed with market data through September 2026.
The headline numbers
| Token | Issuer | Float | Chains | Year launched |
|---|---|---|---|---|
| USDT | Tether Holdings (BVI) | $183.3bn (Sep 2026) | 14 (Ethereum, Tron, Solana, Avalanche, etc.) | 2014 |
| USDC | Circle Internet Group (US, Ireland EMI) | $73.8bn (Sep 2026) | 20+ (Ethereum, Solana, Base, Arbitrum, etc.) | 2018 |
| DAI / USDS | Sky / MakerDAO (decentralised) | $4.58bn (Sep 2026, DAI) | 9 (Ethereum native, bridged elsewhere) | 2017 |
| FDUSD | First Digital Labs (Hong Kong) | $14.6bn (Q1 2026) | 3 (Ethereum, BNB Chain, Sui) | 2023 |
USDT’s dominance is structural — it was first to Binance, first to Bitfinex, first to most Asian venues, and that liquidity head start has not been displaced; in September 2026 it still held about 60.62% of stablecoin market-cap dominance. USDC has the regulatory mandate (Circle is an EU-authorised EMI and a NYDFS-supervised limited purpose trust) and won the institutional segment in 2023-2024, circulating at roughly $73.8 billion and 24.40% dominance. DAI is the only meaningful decentralised holdout — around $4.58 billion in circulation, with a 1.51% volume-to-market-cap ratio — and is in the middle of a brand migration to USDS under the Sky rebrand. FDUSD is a 2023 entrant that grew on Binance’s promotion of zero-fee BTC/FDUSD pairs and remains heavily concentrated on that one venue; CoinGecko showed it trading at $0.9993 with $228,266,051 of 24-hour volume on 19 September 2026. In July 2026 Tether burned $2.5 billion of USDT on Ethereum in a single redemption-driven event, trimming circulating supply by roughly 1.3%; the peg has stayed within a few basis points of $1 (~$0.9993–$0.9994) throughout. Market-cap dominance is not the same as usage dominance, though: Visa’s on-chain data show USDC carrying about 70% of adjusted stablecoin transaction volume in H1 2026 versus USDT’s 25%, even as total adjusted stablecoin volume across the sector hit a record $1.79 trillion in June 2026.
Reserves and counterparty risk
This is where the four diverge most sharply. USDC holds about 80% of reserves in the BlackRock-managed Circle Reserve Fund (CRF), a 2a-7 government money-market fund holding US T-bills and Federal Reserve overnight repo. The remaining ~20% is cash at BNY Mellon, JPMorgan, Citi and a handful of other GSIBs. This is the cleanest reserve profile of the four: short-dated, transparent, custodied at top-tier banks, and verified monthly by Deloitte.
USDT is more heterogeneous. The Q4 2025 BDO Italia attestation listed roughly 84% T-bills and reverse repo, 5% gold, 3% bitcoin, 4% secured loans, and the balance in other investments. Tether’s secured-loan book ($6.4bn at end-2025) and gold/BTC holdings are unique among major stablecoins and represent the bulk of the credit and market risk in the structure. The attestation is quarterly rather than monthly, and Tether has never published a full PCAOB audit. Its primary custodian is Cantor Fitzgerald. The July 2026 burn was funded from reserves against customer redemptions rather than any impairment, and did not change this reserve composition materially.
DAI is unique: its collateral is on-chain and continuously verifiable. The Maker system overcollateralises every DAI in circulation with crypto (ETH, wstETH, wBTC) and tokenised real-world assets (Monetalis-managed T-bills, BlockTower credit). The system collateralisation ratio sat at roughly 178% as of Q1 2026. There is no bank-custody counterparty risk for the crypto collateral; the RWA portion (~$2.1bn) is custodied by US qualified custodians. FDUSD holds cash and short-dated US T-bills custodied with First Digital Trust in Hong Kong, attested monthly by Prescient Assurance. Its concentration in a single Hong Kong trust company is the structural risk.
Freeze powers and censorship resistance
Three of the four have address-freeze capability built into the token contract. USDC’s blacklist function has frozen ~$97m across 252 addresses since 2020, mostly in response to OFAC designations and law-enforcement requests. USDT has frozen ~$1.3bn across roughly 2,100 addresses, the largest counts on Tron rather than Ethereum. FDUSD has a similar freeze function and has used it sparingly — public counts are low but the capability exists. DAI alone has no token-level freeze function. Maker governance can disable a collateral type or change parameters, but cannot blacklist a holder address.
| Token | Freeze function | Addresses frozen (lifetime) | Approx. value frozen | Process |
|---|---|---|---|---|
| USDT | Yes (Treasury multi-sig) | ~2,100 | ~$1.3bn | Law enforcement request, OFAC compliance |
| USDC | Yes (Centre/Circle key) | 252 | ~$97m | OFAC, court order, compliance |
| FDUSD | Yes (issuer key) | Low, undisclosed | Undisclosed | Compliance request |
| DAI | No (contract has no blacklist) | 0 | $0 | N/A — governance can pause modules only |
Regulatory status: who can hold what, where
MiCA’s stablecoin provisions have been fully applicable since 30 December 2024, and the split they created persists. Circle obtained an EMI licence from the ACPR in France and operates EURC and USDC as compliant EMTs across the EU; both BaFin and the AMF list Circle Mint Europe SAS as authorised. Tether did not apply and was delisted from EU-facing order books on Binance, Coinbase, Kraken, Crypto.com and Bitstamp during H2 2024 and Q1 2025. That MiCA gap continues to bite: as of May 2026, USDT, DAI and FDUSD were all still listed as lacking MiCA authorisation, and Revolut fully phased out USDT support for European users on 31 August 2026 after halting new USDT purchases on 6 July 2026, citing Tether’s continued failure to seek authorisation. FDUSD has filed with regulators in Hong Kong under the SFC stablecoin regime that took effect 1 August 2025 but is not MiCA-authorised. DAI sits in a regulatory limbo: it is not an EMT under MiCA because it is not issued by a single legal person, but it is also not clearly outside the regulation. ESMA has so far not pursued enforcement.
In the US the position is the inverse of the EU. The GENIUS Act framework requires payment stablecoins to be backed one-to-one by high-quality liquid reserves and mandates monthly public disclosures plus independent examination; the law takes effect on 18 January 2027 unless final rules arrive sooner. It brings USDC, USDT and FDUSD into a federal/state licensing regime; Tether is currently restructuring a US entity to satisfy the new rules, but as of mid-2026 only USDC and FDUSD are unambiguously positioned for US retail issuance. DAI continues to be treated as a non-issued asset and falls outside the GENIUS perimeter. Our regulatory calendar tracks the implementation deadlines under both regimes.
On-chain liquidity and fee profile
For DeFi use the practical question is where you can swap large size with low slippage and which routing the aggregators prefer. On Ethereum mainnet, USDC has the deepest stable-to-stable liquidity (Curve 3pool, Uniswap v3 USDC/USDT, and the FRAX/USDC pool together hold ~$3.1bn at Q1 2026 prices). USDT is roughly equal on Tron — TRC-20 USDT is the dominant remittance rail in Latin America, South Asia and parts of Africa, with the cheapest transfer cost of any major stablecoin (median ~$0.30 per transfer in 2025). DAI has progressively narrower DEX liquidity since Maker’s pivot to USDS but remains the canonical settlement asset for many DeFi protocols. FDUSD’s DEX depth is thin — roughly $80m across DEX pools — because its primary use case is CEX trading on Binance, where the BTC/FDUSD book is the deepest BTC market by quote volume. Across the sector, adjusted stablecoin transaction volume set a record of $1.79 trillion in June 2026, with USDC now carrying roughly 70% of that adjusted volume against USDT’s 25%, a reminder that USDT’s larger market cap does not translate into proportionate settlement usage.
Chain footprint matters too. USDT issued on Tron (~$72bn) now exceeds USDT on Ethereum (~$56bn) because the per-transfer cost difference (≈$0.30 vs ≈$3.20 at Q1 2026 gas prices) compounds at remittance volumes; the July 2026 Ethereum burn further reduced the Ethereum-side float. USDC’s distribution is the inverse — heaviest on Ethereum, with Base (~$5.4bn) and Solana (~$4.9bn) the next two largest deployments; Circle reports about $77.6 billion of USDC circulating across 20+ chains via CCTP. The practical implication is that the “same” token has slightly different liquidity, redemption mechanics and bridge risk on each chain. A USDC balance on Polygon bridged via the older PoS bridge is not interchangeable with native Circle-issued USDC on Ethereum in a stress event; the bridge introduces a separate failure mode. Circle’s CCTP burn-and-mint protocol is the canonical solution and has progressively replaced the legacy bridges since 2023.
- Cheapest cross-border transfer: TRC-20 USDT (~$0.30 typical fee).
- Deepest DEX liquidity on Ethereum: USDC.
- Most censorship-resistant: DAI (no token-level freeze).
- Best institutional custody profile: USDC (BNY Mellon, BlackRock CRF).
- Deepest CEX BTC pair: FDUSD on Binance (zero-fee promotion).
- Highest adjusted transaction-volume share: USDC (~70% of H1 2026 volume vs USDT’s 25%).
Yield and idle-balance economics
None of the four pays yield to plain token holders — that line is enforced under MiCA Article 45 in the EU and presumed under SEC staff guidance in the US. To earn the underlying T-bill rate (~4.3% SOFR as of Q1 2026) a holder must move the token into a yield-bearing wrapper. For USDC that means the SOFR-linked products from Circle’s institutional programme or third-party tokenised T-bill funds. For DAI the Sky Savings Rate (SSR) currently pays 4.75% directly on chain, the highest rate among native stablecoin savings products. USDT has no native savings rate; users hold T-bill exposure indirectly via lending platforms like Aave and Compound, where the supply APY oscillates between 3.5% and 8% depending on demand. FDUSD has no native yield product. Our stablecoin yield calculator compares the after-fee net return on each token across the major venues.
Which to use, and for what
The decision rule is roughly: USDC for any EU-regulated activity, institutional treasury, or DeFi position requiring regulatory comfort — reinforced by its lead in actual settlement volume. USDT for cross-border transfer (especially TRC-20), Asia-Pacific exchange settlement, and any venue where USDC is not deeply quoted, though EU users should note Revolut’s completed phase-out of USDT support on 31 August 2026 and the broader MiCA gap that left USDT unauthorised as of May 2026. DAI/USDS for DeFi positions where on-chain composability and censorship resistance matter, and for capturing the Sky Savings Rate. FDUSD almost exclusively for Binance trading, where the BTC pair depth justifies holding it.
None of these tokens has a clean profile across every dimension; each is a set of trade-offs between regulatory standing, censorship resistance, distribution reach, and reserve quality. Users who hold significant balances should split across at least two issuers to diversify the residual issuer-default risk — the lesson SVB taught in March 2023, and the lesson Terra taught in May 2022 in a more brutal form. Our stablecoin peg monitor tracks the live deviation, mint and burn velocity and 30-day reserve attestation status for all four, and our market dashboard consolidates float and chain-share data weekly.