Tether

USDT is a stablecoin issued by Tether Limited, pegged 1:1 to the US dollar. It is designed as a digital representation of the US dollar, combining perceived fiat stability with blockchain efficiency.

USDT operates as a second-layer token on various blockchains, including Ethereum (ERC-20), Tron (TRC-20), Solana, Avalanche, Polygon, Omni, Tezos, Near, TON and Aptos. Tether regularly adjusts supported networks, having recently ended minting on EOS, Algorand and others due to limited adoption.

This multi-chain strategy aims to balance adoption with operational efficiency by prioritising networks with high user activity and liquidity, such as Ethereum, Tron and Solana.

USDT serves multiple functions in the digital asset ecosystem:

• Trading and Liquidity: Used as a base pair across numerous centralised and decentralised exchanges, enabling crypto asset conversion with high liquidity.

• Volatility Hedging: Acts as a stable asset for capital preservation during periods of market uncertainty, without requiring conversion back to fiat.

• Payments and Remittances: Facilitates fast, low-cost cross-border transfers, particularly in regions with unstable local currencies or limited financial infrastructure.

• DeFi Applications: Widely used in lending, borrowing, yield generation and as collateral in decentralised finance platforms.

• Store of Value: Functions as a dollar-pegged digital asset in high-inflation economies, accessible to users with internet connectivity.

• Smart Contracts: Enables predictable value transfer in automated contract execution.

Tether states that each USDT is redeemable for $1 via its platform, subject to conditions such as identity verification, a $100,000 minimum redemption, and settlement fees. This redemption mechanism enables arbitrage opportunities that help maintain the market price of USDT near $1.

Initially, Tether claimed each USDT was backed by dollars held in reserve. Later disclosures revealed a more complex reserve composition, including cash equivalents, US Treasuries, secured loans, precious metals and Bitcoin. Quarterly "attestations" by firms such as BDO provide snapshots of reserves, but no full audit has been conducted.

While the company has shifted reserves towards higher-quality assets (notably reducing commercial paper to nearly zero), concerns remain about transparency and the inclusion of risk-bearing assets. Effective stability relies on continued market confidence and secondary market liquidity.

The project was launched in 2014 as "Realcoin" by Brock Pierce, Reeve Collins and Craig Sellars. It was built on Bitcoin’s Omni Layer. The name was changed to Tether in November 2014. In 2015, control shifted to Bitfinex operators.

Tether Limited became a subsidiary of Tether Holdings, which is controlled by iFinex Inc., also the parent of Bitfinex. Executives such as Paolo Ardoino and Giancarlo Devasini hold leadership roles in both companies.

Tether and Bitfinex share operational and financial interdependencies, exemplified in events such as the Crypto Capital incident, where Tether reserves were used to cover exchange shortfalls.

Tether has faced sustained scrutiny from regulators, the media and market participants over the nature and transparency of its reserves, its corporate structure, and its operational practices. Several high-profile investigations and enforcement actions have shaped its public perception.

• Under-collateralisation of Reserves: For several years, Tether claimed that every USDT in circulation was backed 1:1 by US dollars held in reserve. However, investigations later revealed that this was not always the case. In particular, the New York Attorney General (NYAG) and Commodity Futures Trading Commission (CFTC) both found that Tether did not maintain full fiat reserves at all times. The CFTC reported that between 2016 and 2018, Tether held sufficient fiat reserves to back all USDT tokens on just 27.6% of sampled days.

• Crypto Capital Incident and Intercompany Transfers: In 2019, it emerged that Bitfinex had lost access to approximately $850 million held by its third-party payment processor Crypto Capital. To cover withdrawal demands, Bitfinex reportedly borrowed at least $700 million from Tether reserves without disclosing the transaction publicly. The NYAG concluded that this undermined Tether's claim of full backing and constituted a lack of transparency. The case highlighted the operational interdependence between Tether and Bitfinex and the lack of formal agreements or safeguards in fund handling.

• NYAG Settlement – February 2021: Following a two-year investigation, the NYAG concluded that Tether had misrepresented the backing of USDT and had commingled client and corporate funds between Tether and Bitfinex. Tether and Bitfinex agreed to pay an $18.5 million fine and were banned from operating with New York residents. They were also required to submit detailed quarterly reserve breakdowns for two years. While the companies did not admit wrongdoing, the findings indicated periods where USDT was not fully backed and where transparency reports were misleading.

• CFTC Enforcement Action – October 2021: The CFTC imposed a $41 million fine on Tether for making false or misleading claims regarding the nature of its reserves. It found that Tether’s public statements about always being 100% backed by fiat currency were untrue. The CFTC also highlighted that Tether’s reserves included non-cash assets and unsecured receivables, and that funds were commingled with Bitfinex accounts.

• Transparency and Attestations: Tether provides quarterly attestations of its reserves, currently prepared by BDO, but has never undergone a full, independent audit. Attestations confirm reserve snapshots at a point in time but do not assess internal controls or continuous backing. This continues to draw criticism, particularly when compared to competitors like USDC, which provide more frequent and detailed disclosures.

• S&P Global Ratings Assessment (2023): In December 2023, S&P assigned Tether a stability score of 4 on a scale of 1 (strongest) to 5 (weakest), citing constrained transparency. The assessment noted limited disclosure of custodians, counterparties and asset breakdowns. The presence of riskier assets such as Bitcoin and precious metals in the reserve portfolio was also identified as a weakness, as was the lack of clear legal safeguards in the event of issuer insolvency.

• Illicit Finance Risks: Due to its high liquidity and widespread use, USDT has been associated with illicit activity including money laundering, sanction evasion and fraud. A 2023 report by TRM Labs estimated USDT’s involvement in approximately $19.3 billion in illicit transactions. US authorities, including FinCEN and the Treasury Department, have linked USDT to networks attempting to bypass sanctions. Tether states that it cooperates with law enforcement globally, and has frozen hundreds of millions of dollars’ worth of tokens linked to criminal activity when requested. However, it has also expressed reluctance to freeze addresses pre-emptively to avoid disrupting investigations or infringing on decentralised trading activity.

Collectively, these incidents reflect a pattern of legal, operational and reputational challenges that have shaped how Tether is perceived by regulators, institutions and the broader market. While USDT remains the most used stablecoin by volume, these issues continue to raise questions about risk, oversight and long-term sustainability.

The regulatory treatment of USDT varies significantly across jurisdictions, with a widening gap between its global offshore operations and its status in strictly regulated markets like the European Union and the United States.

• European Union (MiCA Enforcement): The Markets in Crypto-Assets (MiCA) framework became fully enforced for stablecoins in mid-2025. Because Tether (USDT) did not adjust its reserve model to meet MiCA’s specific banking requirements, it is widely classified as a "non-compliant" token within the European Economic Area. Consequently, major exchanges have delisted USDT trading pairs for EU users. European customers are generally restricted to "sell-only" modes or forced to convert their holdings into MiCA-compliant alternatives like USDC or EURC.

• United States (The GENIUS Act): In July 2025, the US enacted the Guiding and Establishing National Innovation for US Stablecoins (GENIUS) Act, with strong bipartisan voting statistics (68-30 Senate, 308-122 House), establishing the first federal regulatory framework for payment stablecoins. The law requires issuers to be federally or state-approved and to maintain 1-to-1 reserves in specific high-quality liquid assets. *Tether's Strategy ("USAT"): Rather than altering USDT (which remains an offshore product), Tether announced in late 2025 that it would launch a separate, US-domiciled stablecoin called USAT.** Issued in partnership with federally chartered banks, USAT is designed to meet the GENIUS Act's strict audit and backing standards, allowing Tether to serve the US market without subjecting its global USDT supply to US jurisdiction.

• Sanctions and Enforcement: Even outside of these frameworks, Tether adheres to US sanctions via the Office of Foreign Assets Control (OFAC). Throughout 2025, Tether continued to cooperate with the DOJ and Secret Service, freezing $2.9 billion across over 5,000 wallets linked to illicit activities and human trafficking rings. This "voluntary compliance" remains their primary defense against direct US enforcement actions while they pivot to the new USAT model for compliant onshore business.

1. Issuer - USDT (Tether): Issued by Tether Limited, a centralised entity registered in the British Virgin Islands and controlled by iFinex Inc., which also owns the Bitfinex exchange. - USDC (Circle): Issued by Circle, a regulated financial technology company based in the United States, formerly in partnership with Coinbase under the Centre Consortium. - DAI (MakerDAO): Issued algorithmically through MakerDAO, a decentralised autonomous organisation (DAO), without a central corporate issuer. Governance is performed by MKR token holders.

2. Reserve Model - USDT (Tether): Backed by a mix of assets including US Treasuries, cash equivalents, secured loans, precious metals, and Bitcoin. Quarterly attestations are provided, but no full audit has been conducted. - USDC (Circle): Backed 1:1 by US dollars and short-term Treasury securities held at regulated custodians. Monthly attestations are published by established accounting firms. - DAI (MakerDAO): Backed by overcollateralised crypto assets such as ETH and USDC. Collateral levels and vault positions are managed by smart contracts and visible on-chain.

3. Transparency - USDT (Tether): Provides quarterly reserve attestations through BDO, but the reporting frequency and scope are more limited compared to competitors. No real-time reserve data is available. - USDC (Circle): Offers monthly reserve attestations with detailed breakdowns. Circle has also pursued voluntary regulatory disclosures to align with standards in the US and EU. - DAI (MakerDAO): Fully transparent on-chain. Users can verify collateral ratios, system parameters, and governance decisions in real time using blockchain explorers or Maker interfaces.

4. Regulatory Standing - USDT (Tether): Operates from offshore jurisdictions. Not currently MiCA-compliant and has been involved in settlements with the NYAG and CFTC in the US. Subject to ongoing regulatory scrutiny. - USDC (Circle): Actively pursues compliance with US and EU regulations. Registered as a money transmitter in various US states and has obtained EU electronic money licensing for MiCA readiness. - DAI (MakerDAO): As a decentralised protocol, it has no clear issuer or regulator. Its legal classification remains uncertain, and it may be indirectly affected by the regulatory treatment of DeFi.

5. Primary Strength - USDT (Tether): Offers the deepest liquidity and highest trading volume in the stablecoin market. Integrated widely across centralised and decentralised exchanges. - USDC (Circle): Valued for its regulatory alignment and transparency, making it a preferred option for institutions and in jurisdictions with stricter compliance requirements. - DAI (MakerDAO): Censorship-resistant and trust-minimised by design. Favoured by users and developers who prioritise decentralisation and on-chain control.

6. Key Risk - USDT (Tether): Criticised for lack of full audits, historic under-collateralisation, and exposure to regulatory action. Reserve composition includes some risk-bearing assets. - USDC (Circle): Centralised structure introduces custodial and regulatory risk. Has experienced temporary market disruptions tied to banking partners (e.g. SVB). - DAI (MakerDAO): Exposed to crypto market volatility. Stability mechanisms rely on smart contract security, external price oracles and community governance, which may introduce technical risk.

7. Typical Use Case - USDT (Tether): Commonly used for high-frequency trading, liquidity provisioning and cross-border settlement, especially in markets outside North America and Europe. - USDC (Circle): Frequently used for fiat on/off-ramps, regulated DeFi applications, and institutional payments in jurisdictions with clearer legal frameworks. - DAI (MakerDAO): Used primarily within DeFi protocols, including lending, liquidity pools and decentralised derivatives, where decentralisation and composability are key.

The stablecoin market features centralised and decentralised models, each optimised for different user priorities, such as transparency, stability or autonomy.