0 minsPublished on 11/27/2023

USDT vs USDC: A stablecoin comparison

USDT and USDC are the two largest stablecoins by market capitalization but what separates them? Find out the different qualities of Tether and USDC.

By Corey Barchat


Crypto volatility exists for every token you can think of, from Bitcoin to Shiba Inu. Just as they can experience euphoric rises, cryptocurrencies can also see their price plunge overnight.

To combat these price swings, fiat-backed stablecoins have emerged as a way for investors to remain in the crypto ecosystem holding a token that historically has lower volatility than most other tokens. 

Many stablecoins are pegged to a real-world asset—fiat-backed stablecoins are pegged to a fiat currency—as an attempt to offer resistance against the fluctuations (both up and down) to which other coins are susceptible.

Both USD Coin (USDC) and Tether (USDT) are pegged to the US Dollar and have emerged as the two most popular fiat-backed stablecoins, appearing in most major cryptocurrency exchanges, wallets, and applications.

If you're considering which stablecoin is a better fit for your needs, it helps to understand how each one functions. 

Learn more in this article about the differences between USDC and USDT.

What is a fiat-backed stablecoin?

A fiat-backed stablecoin is a cryptocurrency whose value is pegged to a fiat currency and may be backed by a basket of external assets, such as cash, government bonds, or other assets, in an attempt to keep the price of the crypto asset stable.

For a long time, Bitcoin and early cryptocurrencies could only be exchanged for other cryptocurrencies or fiat currencies. If you wanted to swap tokens, there was no way for crypto holders to move into a fiat-backed asset without exiting the cryptocurrency ecosystem altogether. This is where stablecoins stepped in.

Many crypto traders utilize fiat-backed stablecoins in order to remain in the ecosystem by holding a digital currency that is historically less volatile than many other tokens that can be exchanged 24 hours a day without having to directly convert to fiat currency. 

What is USDT?

USDT is a fiat-backed stablecoin first issued by Hong Kong-based Tether Limited in 2014 in order to bridge the gap between cryptocurrency and fiat currency. 

When it was launched, Tether gave users access to a platform-agnostic, blockchain-based and fiat-backed stablecoin  that was pegged to the US Dollar that held many of the technical advantages of Bitcoin, Ethereum, and other crypto assets, but was designed to have less volatility than other crypto assets. 

By tapping into the best of both worlds, Tether created a permissionless way to send a new type of crypto asset to anyone with speed, transparency, and low cost, opening up the use case of cryptocurrencies to remittances, payments, and more.

An image of the USDT Tether logo

Upon its release, hundreds of cryptocurrency trading pairs began listing against USDT, giving the coin a first-mover advantage in the fiat-backed stablecoin market. 

As of time of publication, there are more than 87 billion USDT tokens circulating on most major blockchains, including Bitcoin, Ethereum, EOS, Algorand, Tron, and more. Up-to-date Tether circulation information is available here.

Tether is the one of the crypto market's most popular trading pairs by volume, and can be used on crypto exchanges to buy or swap for hundreds of other cryptocurrencies. USDT stablecoins allow anyone to transact cheaply and quickly, and potentially generate interest on decentralized finance protocols, including yield farming, staking, and liquidity pools

*These decentralized finance protocols also present a risk of loss and you should do your own research before making any decisions on whether to participate.

USDT also gives merchants a way to accept cryptocurrency payments denominated in a fiat currency, instead of more volatile cryptocurrencies.

USDT volume and market cap

USDT has consistently stayed in the top 5 of all cryptocurrencies in terms of market cap and trade volume, often exceeding the daily trading volume of Bitcoin.

A graph of USDT’s market capitalization increasing over time.

USDT stability

USDT has been designed to be pegged to the US dollar and Tether Limited claims that USDT is fully backed by its reserves, as an attempt to maintain USDT’s value at $1.

While there can occasionally be slight fluctuations in price of a few cents, the market has historically corrected itself to return USDT to a price of about $1.00.

What is USDC?

USDC is a fiat-backed stablecoin pegged to the US dollar on the Ethereum blockchain, created by Circle and Coinbase in 2018. 

Like USDT or any other fiat-backed stablecoin pegged to USD, its goal is to have a steady price of $1. As with USDT, Circle tries to maintain a stable price of $1 by asserting that USDC is fully backed by its reserves

For most of its existence, the USDC token has been governed by the Centre Consortium, made up of a group of crypto-based companies including Circle and Coinbase. Recently, Centre announced that they are shutting down. As a result, Coinbase took an equity stake in Circle, and Circle itself took full control over the USD stablecoin, including issuance and governance.

An image of the USDC logo

Circle oversees the technical and financial standards for USDC stablecoins and claims to provide transparency around a true 1-to-1 backing. This means that for every USDC created, $1 of USD is held in reserve in the form of US Dollars and other cash equivalents.

As of time of publication, there is a circulating supply of over 24 billion USDC, with an equal dollar amount in reserves. Up-to-date USDC circulation information is available here.

USDC can be issued by approved regulated financial institutions that meet Circle's membership framework, which allows for the growth of the USDC ecosystem.

USDC is available on most major exchanges and cryptocurrency providers. Like USDT, USD Coin can be sent and received by any wallet or exchange that is ERC-20 (Ethereum) compatible, along with many other blockchains such as Algorand, Stellar, Binance Smart Chain, Hedera, Tron, Solana, and more.

Recently, Circle announced that they are phasing out the use of "USD Coin" in favor of the simplified "USDC".

USDC volume and market cap

USDC often ranks in the top 10 of all cryptocurrencies in terms of market cap and daily trading volume, though behind that of USDT.

A graph of USDC’s market capitalization over time.

USDC stability

Circle tries to maintain a stable price of $1 for USDC by backing it 1:1 with a reserve of assets, as mentioned above. There can be slight fluctuations with any fiat-backed stablecoin and usually these are quickly corrected, bringing the price back to $1.

 In March, 2023, however, the value of USDC ‘de-pegged’ and fell to just below $0.90 after the failure of Silicon Valley Bank. (This USDC de-pegging event also caused the price of USDT to temporarily increase above $1.)


USDT is used more frequently for trading and payments, USDC is viewed by some as a safer stablecoin because Circle has its reserves attested to by an independent auditor monthly, while Tether’s attestations occur quarterly. 

A table showing the differences between USDC vs USDT.

Additionally, Circle’s reserves for USDC appear to consist of only U.S. Treasury securities and cash. Tether’s reserves for USDT appear to consist of U.S. Treasury securities, short-term repurchase agreements, money market funds, cash, non-U.S. Treasury bills, corporate bonds, precious metals, bitcoins, ‘other investments’, and secured loans.

Trading pairs

Both USDT and USDC are popular choices to be used as swapping pairs on DeFi (decentralized finance) protocols. With USDT's 4-year head start, they have long been the most widely-used stablecoin with the highest consistent trading volume. USDC has since closed the gap somewhat, and is now available on many of the same blockchains as Tether.

Safety and transparency

In the past, USDT received some scrutiny due to Tether's hesitance to release complete and frequent updates on how the coin is backed. On the other hand, USDC's parent company Circle has consistently released regularly audited reports on their reserves.

Although they eventually released a breakdown of their reserves in March, 2021, Tether fought to prevent their reserve composition from going public, even going so far as asking the New York Supreme Court to block the state Attorney General from releasing documents to CoinDesk after the latter filed a Freedom of Information Law (FOIL) request.

A screenshot of Tether’s reserves for its fiat-backed stablecoins.

Since then, Tether has taken steps to become more transparent by publishing the contents of their reserves and providing daily updates. While this is a good start, there are still some, such as the Commodity Futures Trading commission, calling on Tether to perform a full audit. One former Tether auditing firm was even fined $1 million by the SEC for what they considered "sloppy accounting work".

USDC, on the other hand, has historically provided more information about its reserves. Circle releases monthly audits into their reserves by accounting firm Grant Thornton LLP. They also pledged to only own US dollars and short term treasury bills.

A screenshot of USDC's asset reserves.

“There's a reason why USDC is regulated and supervised by banking regulators under the same laws that supervise the balances you hold on PayPal or with Apple or with Square,” Circle CEO Jeremy Allaire told the Brookings Institute. “Those things have applied to us since day one. And those statutes exist so that people have confidence in these electronic payment systems. And I think that's really important.”

Stablecoin regulation

Over the years, the Biden administration has published reports calling for greater regulation of stablecoins, and the Treasury Department has been pressuring Congress to pass legislation requiring stablecoin issuers to become insured depository institutions (similar to a bank). 

The markets in crypto assets regulation (MiCAR) came into force in the European Union on June 30, 2023, and its rules on fiat-backed stablecoins (referred to as electronic money tokens) apply from June 30, 2024. The UK also plans on regulating fiat-backed stablecoins in the near future. 

With stablecoin regulation being an ongoing process, it's vital that issuers take the precautionary steps necessary to not be caught off guard once more laws are passed.

Should I use USDC or USDT?

If you're interested in participating in a specific blockchain or DeFi protocol, then you'll need to make sure the stablecoin you select is supported on that network. USDC and USDT can both be used for lending, staking, and providing liquidity for trading pairs, though the returns and functionality for each may vary.

One thing to consider when deciding which stablecoin to buy is the potential to earn interest on your crypto holdings:

Generate revenue with USDC and USDT

One reason why DeFi is so popular is that it offers a number of different services that allow a holder of certain tokens, including fiat-backed stablecoins, to generate additional revenue. One such option is to earn interest by lending your tokens on a variety of platforms. 

You'll have complete control when choosing where to invest your money compared to doing so with a standard bank.

If you’re interested in the metrics at a given time, DefiLlama has several convenient tools where you can view the yield rankings and current APY for different stablecoins.

Of course, there are always risks associated with any potential staking or lending returns, and it's important to do your own research to understand each platform and financial instrument.

Frequently asked questions (FAQs) about USDC and USDT stablecoins

Are there other USD stablecoins?

With multi-billion-dollar market capitalizations, USDT and USDC are the most popular stablecoins used today. But they are not the only ones. 

For example, there is Dai (DAI), an Ethereum-based stablecoin alternative. Like other crypto assets, stablecoins are designed to function on a specific blockchain network.

A pie chart of stablecoin popularity by blockchain.

Just like USDC and USDT, DAI attempts to maintain a price equal to $1, but that doesn't mean it is completely interchangeable—the stablecoin you choose to purchase will depend on which blockchain and applications you wish to interact with.

Can I swap USDT for USDC?

There are many crypto exchanges and applications that allow you to convert USDC to USDT and vice versa. When researching exchange platforms, you should make sure that they support the coins you want to trade, and pay attention to conversion rates and fees.

MoonPay makes it easy to swap crypto assets like USDT and USDC, along with many other trading pair combinations.

Is USDT a more widely-used stablecoin than USDC?

Both USDT and USDC have seen popular adoption across cryptocurrency exchanges, wallets, on-ramps, and other applications. However, USDT generally has a much higher market cap, circulating supply, and trading volume than USDC.

Can I use stablecoins for daily transactions?

Fiat-backed stablecoins like USDT and USDC are often supported by merchants that accept crypto payments. Exact coverage will depend on the specific merchant, but fiat-backed stablecoins provide a convenient way to transact cryptocurrencies with less price volatility than many other digital assets.

Are there regulations for stablecoins like USDC and USDT?

The question of stablecoins has long been a hot button issue among regulators, as covered above. The SEC and US regulators, for example, have had stablecoins like USDT and USDC in their crosshairs for years, so it's important to pay attention to web3 and traditional news sources for breaking developments regarding stablecoin regulation.

How to buy USDT and USDC

You can buy USDT and USDC via MoonPay or through any of our partner wallet applications with a credit card, bank transfer, Apple Pay, Google Pay, and many other payment methods.

Just enter the amount of USDT or USDC you wish to purchase and follow the steps to complete your order. MoonPay makes it easy to buy USDC and USDT, and send to any custodial or non-custodial crypto wallet.

A screenshot of MoonPay's Buy USDT and Buy USDC widgets.

How to sell USDC and USDT

MoonPay makes it easy to sell USDT and USDC for fiat currency when you decide it's time to cash out your crypto.

Simply enter the amount of USDC or USDT you'd like to sell and enter the details where you want to receive your funds.

Corey Barchat
Written byCorey Barchat

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