USDT vs USDC: Differences, Risks and Which to Use (2026)

USDT and USDC are both digital dollars. Each is meant to be worth exactly one US dollar, each can be sent anywhere in the world in seconds, and together they make up more than 80% of all stablecoins. Most people end up holding whichever one their exchange or employer happened to hand them.

They aren’t the same, though. Different companies issue them, different assets back them, regulators treat them differently, and they live mostly on different blockchains. In 2026 those differences matter more than they used to, because the US and the EU are both now drawing lines between them.

This guide compares USDT and USDC using figures from October 2026, then gets practical about which one to hold and which one to spend.

The short version

	USDT (Tether)	USDC (Circle)
Issuer	Tether, headquartered in El Salvador	Circle, a US company listed on the NYSE
In circulation (14 Oct 2026)	$183.9 billion	$73.1 billion
Share of all stablecoins	59%	23.5%
Backed by	Mostly US Treasury bills, plus repo, gold, bitcoin and secured loans	Cash and short-dated US government assets
Reserve reporting	Quarterly attestations, first full audit published in 2026	Monthly third-party reports, weekly disclosures
Where most of it lives	Tron, then Ethereum	Ethereum, then Solana, Base and others
EU status	Not authorised under MiCA	Authorised under MiCA
Pays you interest	No	No
Issuer can freeze tokens	Yes	Yes

If you want one line: USDT is bigger and more widely accepted around the world, especially for payments and trading. USDC has simpler reserves and an easier regulatory path in the US and Europe.

What’s the difference between USDT and USDC?

Three differences matter more than the rest.

Who stands behind them. USDT is issued by Tether, a privately held company now based in El Salvador. USDC is issued by Circle, which listed on the New York Stock Exchange in June 2025 and received approval for a US national trust bank in July 2026.

What backs them. Both say every token is backed by at least a dollar of reserves. Circle keeps only cash and short-term US government assets. Tether holds mostly US Treasury bills too, but also gold, bitcoin and loans, which can lose value.

Where they’re accepted. USDT dominates in Asia, Africa, Latin America and on most crypto exchanges, and most of it moves on the Tron blockchain. USDC is the stablecoin of choice for US fintech. Visa settles in it, and Stripe’s and Shopify’s built-in stablecoin payments use it.

How big are USDT and USDC?

In October 2026, according to DefiLlama, there were about $311 billion of stablecoins in circulation. USDT made up $183.9 billion of that and USDC $73.1 billion.

Neither has grown much this year. USDT was up about 2% on October 2025 and USDC was down about 3%, after both hit record highs earlier in 2026. USDT is still two and a half times the size of USDC, and on most trading pairs and in most countries, it’s the stablecoin with more liquidity.

Who issues them and how they’re checked

Tether issues USDT through Tether International, S.A. de C.V., and moved its headquarters to El Salvador after getting a stablecoin licence there in January 2025. For years its biggest criticism was that it had never had a full audit. That changed in August 2026, when Tether published its first audited financial statements, audited by KPMG, which showed reserves exceeding liabilities by $6.8 billion at the end of 2025. Between audits, the accounting firm BDO publishes a quarterly attestation of its reserves.

Circle issues USDC. It’s a public company, so it files reports with US regulators. It publishes a weekly breakdown of USDC reserves, and a Big Four accounting firm provides monthly assurance on them.

What backs USDT and USDC (and is USDT safe?)

This is the honest heart of the comparison.

USDC’s reserves sit almost entirely in the Circle Reserve Fund, a US government money market fund managed by BlackRock and registered with the SEC, plus cash at large banks. In other words, cash, Treasury bills and repurchase agreements. It’s about as plain as a reserve can be, and it’s the kind of reserve the new US rules require.

USDT’s reserves at 30 June 2026, according to Tether’s latest attestation:

Asset	Value	Share of reserves
US Treasury bills	$115.0 billion	About 61%
Repurchase agreements	$25.6 billion	About 14%
Gold (146 tonnes)	$18.8 billion	About 10%
Secured loans	$13.5 billion	About 7%
Bitcoin (98,933 BTC)	$5.8 billion	About 3%
Other investments	$5.2 billion	About 3%

Tether reported $187.8 billion of assets against $183.6 billion of liabilities, a cushion of $4.1 billion. That cushion was half the size it had been three months earlier.

So is USDT safe? Three-quarters of its reserves are in Treasury bills and repo, which are about as safe as assets get. The other quarter is in gold, bitcoin and loans, which can fall in value. Tether’s cushion is there to absorb that, but a sharp fall in gold and bitcoin together would eat into it. USDC doesn’t carry that kind of risk, though it carries others, such as relying on banks, which is exactly what went wrong for it in 2023.

Neither is risk-free. Both are much safer than holding a volatile coin if what you want is a dollar.

Have USDT or USDC ever lost their peg?

Yes, both, briefly.

• USDC fell to around 87 cents on 11 March 2023, after Circle revealed that $3.3 billion of its reserves were stuck at Silicon Valley Bank, which had just collapsed. It was back at a dollar within two days, once US regulators guaranteed the bank’s deposits.
• USDT dipped to about 95 cents on 12 May 2022, during the collapse of the Terra stablecoin, and recovered within days.

We found no significant de-peg for either one in 2025 or 2026. Both have stayed within about a tenth of a cent of a dollar.

How USDT and USDC are regulated in 2026

In the United States

The GENIUS Act, signed on 18 July 2025, is the first US law for stablecoins. Issuers have to hold one-for-one reserves in cash, insured deposits, Treasury bills maturing within 93 days, repo or government money market funds, get those reserves examined every month, and publish audited accounts once they pass $50 billion. They also can’t pay holders interest.

The law takes effect by 18 January 2027 at the latest. The deadline that matters for USDT is 18 July 2028. From then, US exchanges and apps can only offer stablecoins from approved issuers, or from foreign issuers whose home country’s rules the US Treasury has judged comparable. USDC is built to fit those rules. Whether USDT qualifies as a foreign stablecoin isn’t settled yet. Treasury proposed its rules in August 2026, and they don’t yet say how a country’s regime will be judged.

Tether’s answer for the US market is a separate coin, USAT, launched in January 2026 and issued by Anchorage Digital Bank. It’s still small, with about $183 million in circulation.

Holding and sending USDT in the US is legal today, and the law specifically leaves alone transfers between individuals and self-custody wallets.

In the European Union

The EU’s MiCA rules require stablecoin issuers to be authorised. Circle is, through an electronic money licence in France granted in July 2024. Tether isn’t.

That’s why Coinbase, Binance and Kraken stopped offering USDT trading to customers in the European Economic Area in late 2024 and early 2025. On 8 October 2026, the EU’s markets regulator ESMA went further and told authorised crypto platforms to wind down all remaining services for unauthorised stablecoins within three months. If you’re in the EU and hold USDT on an exchange, expect to be asked to convert or withdraw it by early 2027. USDT in your own wallet stays yours.

Can USDT and USDC be frozen?

Yes. Both are issued by companies that can blacklist an address so the tokens in it can’t move, usually because of hacks, scams or sanctions.

Tether uses this power far more. Tether says it has helped freeze more than $4.4 billion of USDT in cooperation with law enforcement. One analysis by the blockchain security firm AMLBot found Tether froze about $3.3 billion across roughly 7,300 addresses between 2023 and 2025, compared with about $109 million across 372 addresses for Circle.

For ordinary users this almost never matters. It does mean neither one is censorship-resistant in the way bitcoin is.

Which blockchains are USDT and USDC on?

This is the difference that trips people up day to day.

USDT lives mainly on Tron, which holds about half of it, and Ethereum, which holds most of the rest. It’s also on Solana, TON and a bridged version on BNB Smart Chain.

USDC lives mainly on Ethereum, which holds about 62% of it, followed by Hyperliquid, Solana, Base, Arbitrum, Polygon and BNB Smart Chain. There’s almost no USDC on Tron.

So if your wallet or exchange runs mostly on Tron, you’ll find it easier to use USDT. If you use apps on Base or Solana, USDC is usually the native choice. Either way, both sides of a payment have to be on the same network. Our guide to TRC20, ERC20 and BEP20 covers which network to use and what each one costs.

Do USDT or USDC pay interest?

No. The issuers invest the reserves and keep the income. Circle earned a 3.48% return on USDC reserves in the second quarter of 2026, and none of that goes to holders. The GENIUS Act now explicitly bans US-regulated issuers from paying holders interest.

You may see “USDC rewards” on some exchanges. Those are paid by the exchange, not by Circle, and whether exchanges can keep doing it is a live political fight in the US.

How to convert USDT to USDC (or the other way round)

You can swap one for the other on almost any exchange, or on a decentralised exchange like Uniswap, where the USDC/USDT pool charges as little as 0.01% plus the network fee. Conversions aren’t always free, though. Kraken, for example, offers free one-for-one conversion between dollars and USDC, but not USDT.

If you’re about to spend, don’t convert at all. Pay with the one you already hold. Most merchants that take one take both, and every swap costs you something.

So which should you use?

For spending and payments: USDT is accepted in more places worldwide, particularly in emerging markets and by crypto-native merchants. USDC is the better bet with mainstream US payment companies like Stripe, Shopify and Coinbase.

If you live in the EU: USDC. USDT is being phased off regulated European platforms.

For holding a balance you care about: USDC’s reserves are simpler and its regulatory position in the US and EU is clearer. Some people split their holdings between the two so they don’t depend on one issuer.

For sending money to someone: use whichever they use, on the network they use. That matters more than which coin is “better”.

Using USDT and USDC on SpendCrypto

Both work for every gift card and eSIM on SpendCrypto, and a $100 card costs the same in either. We accept:

• USDT on Ethereum, BNB Smart Chain, Tron and Polygon
• USDC on Ethereum, BNB Smart Chain and Polygon

We don’t currently accept USDC on Solana or Base, so if that’s where yours is, you’ll need to move it to one of the networks above first. The supported cryptos page always has the current list. For a walk-through of paying with stablecoins, see how to pay with USDT, and for a setup that keeps spending money separate from savings, our piece on spending stablecoins day to day.

Common questions

Is USDT or USDC safer?

USDC has the simpler reserves, holding only cash and short-term US government assets, and a clearer regulatory position. USDT is larger and now audited, but about a quarter of its reserves are in gold, bitcoin and loans that can lose value. Both have briefly lost their peg once and recovered.

Is USDC the same as USDT?

No. Both aim to be worth one US dollar, but they’re issued by different companies, backed by different assets and regulated differently. One USDT and one USDC usually trade within a fraction of a cent of each other.

Is USDT safe to hold?

For most people holding modest amounts, USDT has worked as intended: it has held its dollar value apart from a brief dip in 2022, and it published its first full audit in 2026. The main risks are the riskier quarter of its reserves and regulation, especially in the EU and, from 2028, the US.

Why can’t I buy USDT in Europe?

USDT isn’t authorised under the EU’s MiCA rules, so regulated exchanges stopped offering it to customers in the European Economic Area in 2024 and 2025, and are now winding down remaining services. You can still hold USDT in your own wallet.

Do you earn interest on USDT or USDC?

Not from the issuer. Tether and Circle keep the income from their reserves. Some exchanges offer rewards on USDC, paid by the exchange itself.

Should I convert USDT to USDC?

Only if you have a reason to, such as living in the EU or wanting simpler reserves for a balance you’ll hold for a long time. Each conversion costs a trading or network fee, so for spending, use whichever you already have.

Can I use both USDT and USDC to buy gift cards?

Yes. SpendCrypto accepts both, USDT on Ethereum, BNB Smart Chain, Tron and Polygon, and USDC on Ethereum, BNB Smart Chain and Polygon, and the price of a card is the same either way.