What Is Tether? USDT Explained Simply
Tether's USDT is the largest stablecoin in the world with approximately $189 billion in circulation, more than Bitcoin's entire market cap at some points in crypto history. It is the most traded cryptocurrency by volume globally, used by more than 550 million people. Here is what it is, how it works, and why it remains controversial despite its dominance.
TL;DR: Tether (USDT) is a stablecoin, a cryptocurrency designed to maintain a 1:1 value with the US dollar. It was launched in 2014 and has grown to approximately $189 billion in circulation as of mid-2026, making it the largest stablecoin and the most traded cryptocurrency by daily volume globally. Each USDT is supposed to be backed by real-world assets held in reserve, primarily US Treasury bills, which now make up roughly 80 percent of Tether's reserves according to quarterly attestations from BDO Italia. In March 2026, Tether announced it had engaged KPMG for its first ever full financial statement audit, with PwC brought in to prepare internal systems, marking the most significant transparency step in the company's twelve-year history. MediaCrypto note: USDT is simultaneously the most used and most scrutinized asset in crypto. Its track record of maintaining its peg over ten years and $189 billion in supply is real. So is its history of regulatory settlements and its ongoing absence of a full independent audit until 2026.
If you have ever bought, sold, or traded cryptocurrency on any major exchange, you have almost certainly used Tether, even if you did not realize it. USDT is the default unit of account on most crypto trading platforms, the dollar-equivalent that sits between your trades, the stablecoin you receive when you sell Bitcoin and are not yet ready to convert back to fiat.
Understanding what Tether is and how it actually works is one of the most practically important things anyone who participates in crypto markets can know, because Tether's health and its 1:1 dollar peg underpin enormous amounts of daily trading activity.
What a Stablecoin Is and Why It Exists
Before explaining Tether specifically, it helps to understand why stablecoins exist at all. Most cryptocurrencies, Bitcoin, Ethereum, Solana, fluctuate significantly in value. A trader who sells Bitcoin and wants to wait for a better entry point before buying back does not necessarily want to convert all the way back to fiat currency, which involves exchange fees, bank transfers, and potentially tax events in some jurisdictions.
A stablecoin solves this problem by providing a crypto asset that holds a stable value, typically pegged to the US dollar. Holding USDT is like holding dollars within the crypto ecosystem, with the ability to move it instantly to any wallet or exchange without leaving the crypto rails.
This is why USDT has become the most traded cryptocurrency by volume globally, exceeding even Bitcoin's daily trading volume on many days. It is not primarily an investment or a speculative asset. It is infrastructure, the shared unit of account that makes crypto trading function smoothly.
How Tether Works
Tether maintains the USDT peg through a redemption mechanism. When someone deposits $1 with Tether and receives 1 USDT, Tether takes that dollar and holds it in reserve. When someone redeems 1 USDT for $1, Tether destroys that USDT token and returns the dollar from its reserves.
In theory, this mechanism keeps USDT worth exactly $1 at all times, because anyone holding USDT at a price below $1 can theoretically redeem it directly with Tether for $1, removing the price discount. In practice, direct redemption through Tether requires meeting minimum thresholds and verification requirements that make it inaccessible for small retail holders. Market makers and institutional participants handle most of the arbitrage that keeps USDT close to $1 in actual trading.
USDT runs across more than 15 blockchains as of 2026, with the largest supplies on Ethereum, where approximately $95 billion sits, and Tron, where approximately $88 billion sits. The Tron network's dominance for USDT reflects its use in emerging markets, specifically retail dollar-equivalent transactions in countries like Argentina, Turkey, Vietnam, and Nigeria where local currency volatility makes a USD-pegged token practically useful for everyday transactions and cross-border remittances.
What Is Actually in Tether's Reserves
This is the question that has followed Tether since its founding. The short answer as of Q1 2026 is that Tether's reserves are predominantly US Treasury bills, roughly 80 percent, with the remainder in overnight repo agreements, cash, approximately $8 billion in gold, approximately $7 billion in Bitcoin, secured loans, and other investments.
These figures come from quarterly attestations published by BDO Italia, an accounting firm that has verified Tether's reserve composition on a point-in-time basis since 2021. An attestation confirms that on a specific reporting date, the described reserves existed as stated. This is different from a full audit, which examines internal controls and accounting systems across a period of time rather than just confirming a snapshot.
Tether's Q1 2026 total assets stood at approximately $191.77 billion against $189.77 billion in net circulating USDT, giving it a net equity buffer of approximately $8.23 billion. This buffer means Tether holds more assets than it has issued tokens, which is structurally positive and represents a meaningful improvement from earlier periods when the reserve composition was more opaque.
The KPMG Audit Announcement
The most significant development in Tether's transparency history came in March 2026, when the Financial Times reported that Tether had engaged KPMG to conduct a full financial statement audit of its USDT reserves, with PwC brought in to help prepare internal systems. This was the first time Tether had engaged a Big Four accounting firm for a comprehensive audit rather than the quarterly point-in-time attestations from BDO Italia.
CEO Paolo Ardoino described the audit as representing years of work to strengthen Tether's systems, and CFO Simon McWilliams confirmed the firm was selected through a competitive process. The audit, when complete, would go beyond monthly attestations to require a detailed review of assets, liabilities, internal controls, and reporting systems across a period, representing a structural shift in how Tether's reserves are verified.
The timing aligned with Tether's stated intention to expand into the US market and raise up to $20 billion in investor capital. A full Big Four audit is a prerequisite for the kind of institutional relationships that US market expansion requires.
The Regulatory History That Matters
Anyone evaluating Tether honestly needs to understand its regulatory history, because it directly shaped the transparency practices now in place.
In February 2021, the New York Attorney General settled with Tether and its affiliated exchange Bitfinex for $18.5 million, following an investigation that found Tether had misrepresented the composition of its reserves during the 2016 to 2018 period, when reserves did not consistently match the publicly stated 1:1 USD backing. The settlement required Tether to publish quarterly reserve breakdowns, which is the disclosure regime still in place today.
In October 2021, the CFTC fined Tether $41 million for similar misrepresentations about reserve backing during the same historical period. Tether did not admit wrongdoing in either settlement but agreed to the enhanced disclosure requirements.
These enforcement actions represent the historical period when Tether's reserve management was genuinely problematic. The current quarterly attestation regime with BDO Italia, the reserve composition shift toward predominantly US Treasuries, and the 2026 KPMG audit engagement represent the period of correction and normalization that followed. The historical record is part of understanding Tether. So is the trajectory since 2021.
The MiCA Delisting and Why It Matters
One of the most significant recent developments for USDT is its delisting from European exchanges. The EU's MiCA regulation, fully effective for stablecoins in June 2024, requires e-money token authorization for any fiat-pegged stablecoin offered to EU users. Tether declined to apply for this authorization, citing concerns about the reserve disclosure rules MiCA requires, specifically the requirement for a significant portion of reserves to be held in bank deposits rather than Tether's preferred mix of Treasury bills.
The result was that Binance, Kraken, Coinbase EU, OKX, and Bitstamp all removed USDT trading pairs for EU users through late 2024 and 2025. EU market share shifted toward Circle's USDC, which does hold MiCA authorization, and toward euro-denominated stablecoins.
Outside the EU, USDT volumes grew during the same period, particularly in emerging markets where regulatory requirements are less stringent and the dollar-equivalent utility of USDT is most practically valuable. The EU delisting is a meaningful loss of market access, not a terminal problem for a stablecoin with $189 billion in circulation and 550 million global users.
USDT vs USDC: The Practical Comparison
The most frequently asked question about stablecoins among new crypto users is whether to use USDT or USDC. Both maintain a dollar peg. Both are widely supported across major exchanges and DeFi protocols. The practical differences come down to regulatory standing and transparency.
USDC, issued by Circle, holds an EU MiCA e-money license, has US headquarters with full regulatory visibility, and provides monthly reserve attestations from Deloitte. It is the preferred stablecoin for institutional treasury use in regulated environments and for EU market participants.
USDT has greater global liquidity, deeper exchange integration particularly in emerging markets, and historically lower redemption minimums that make it more accessible for everyday crypto trading. Its regulatory standing is less clear in US markets, given Tether's exit from direct US customer relationships in 2023.
For most practical crypto trading purposes, USDT is the more liquid option and the one you will encounter most often. For holding significant stablecoin balances for longer periods, especially in institutional or regulated contexts, USDC's cleaner regulatory profile is worth the potentially slightly lower liquidity.
About the Author
This article was researched and written by the MediaCrypto editorial team. MediaCrypto is a cryptocurrency news and market analysis publication covering Bitcoin, Ethereum, altcoins, regulatory developments, and market trends. Follow our daily analysis on X at @MediaCryptoAI.
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FAQ — What Is Tether USDT
What is Tether and how does it work? Tether (USDT) is a stablecoin pegged 1:1 to the US dollar. Each USDT is supposed to be backed by real-world assets held in reserve, primarily US Treasury bills. Users can mint USDT by depositing dollars with Tether and redeem USDT for dollars through the same process.
How much Tether is in circulation? As of mid-2026, approximately $189 billion in USDT is in circulation, making it the largest stablecoin by market cap and the most traded cryptocurrency by daily volume globally.
What backs Tether's reserves? According to Tether's Q1 2026 BDO Italia attestation, reserves are approximately 80 percent US Treasury bills, with the remainder in overnight repo agreements, cash, approximately $8 billion in gold, approximately $7 billion in Bitcoin, and secured loans. Total assets of $191.77 billion exceed the $189.77 billion in circulating USDT.
Has Tether ever been audited? Tether has published quarterly point-in-time attestations from BDO Italia since 2021, but had not completed a full financial statement audit until announcing in March 2026 that it had engaged KPMG for its first comprehensive audit, with PwC brought in to prepare internal systems.
Why was USDT delisted from European exchanges? The EU's MiCA regulation requires e-money token authorization for stablecoins offered to EU users. Tether declined to apply for this authorization, leading Binance, Kraken, Coinbase EU, and others to delist USDT trading pairs for EU users through late 2024 and 2025.
Is USDT safer than USDC? USDC has cleaner regulatory standing in the US and EU, monthly Deloitte attestations, and full MiCA authorization. USDT has greater global liquidity, particularly in emerging markets. For significant long-term stablecoin holdings in regulated environments, USDC's transparency profile is generally preferred. For everyday crypto trading, USDT's deeper liquidity is a practical advantage.
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This article is for informational purposes only and does not constitute financial advice. Always do your own research before making investment decisions.
