Tether (USDT) is the world’s largest stablecoin by market cap — yet since its launch in 2014 it has faced persistent questions about whether its circulating tokens are genuinely backed 1:1 by US dollars held in reserve. The controversy peaked in 2019 when the New York Attorney General’s office revealed that Tether had secretly used reserves to cover an $850 million shortfall at its sister exchange Bitfinex, fundamentally shaking confidence in USDT’s peg and prompting years of legal and regulatory scrutiny.
Background: Tether and Bitfinex
Tether Limited and iFinex Inc. (the parent company of Bitfinex) share overlapping ownership and management, a relationship that critics argue creates irreconcilable conflicts of interest. USDT was originally issued on the Bitcoin Omni Layer before expanding to Ethereum, Tron, Solana, and other chains, becoming the backbone of crypto trading liquidity worldwide.
The Reserve Backing Dispute
From 2017 to 2021, Tether claimed USDT was backed “100% by traditional currency held in our reserves.” Critics — including Cornell researchers Bhose and Griffin (2018) and anonymous researcher Bitfinex’ed on Twitter — argued that Tether was being printed without corresponding dollar deposits to manipulate Bitcoin’s price. Tether’s own attestations (not full audits by a Big Four firm) showed shifting compositions: at various points reserves included commercial paper, secured loans, corporate bonds, and even other digital tokens — not exclusively USD cash.
A June 2021 CFTC settlement revealed that Tether had maintained “adequate” dollar backing for only 27.6% of the days between 2016 and 2018. The company paid a $41 million fine. No criminal charges were filed.
The NYAG Investigation and Bitfinex Cover-Up
In April 2019, NYAG Letitia James alleged Tether and Bitfinex had defrauded New York customers by:
- Losing $850 million through a Panamanian payment processor (Crypto Capital Corp) that was seized by Polish authorities
- Secretly lending $700 million from Tether’s reserves to Bitfinex to cover the loss
- Continuing to claim full USDT backing while the reserves were impaired
In February 2021, Tether and Bitfinex settled with the NYAG for $18.5 million — without admitting wrongdoing — and agreed to submit quarterly reserve reports for two years.
Reserve Composition Over Time
As of 2024, Tether publishes quarterly attestations (by BDO Italia) breaking down its reserves:
| Category | Approximate Share (Q3 2024) |
|---|---|
| US Treasury Bills | ~84% |
| Money Market Funds | ~5% |
| Bitcoin | ~4% |
| Other cash and equivalents | ~7% |
The heavy shift toward T-bills (from heavy commercial paper in 2021) has reduced criticism, though no full independent audit has ever been completed.
Price Stability Record
Despite the controversy, USDT has never suffered a permanent depeg. During the Terra/LUNA collapse in May 2022, USDT briefly traded at $0.995 before recovering. Its resilience has reinforced the “too big to fail” narrative — with over $100 billion in circulation, a USDT depeg would cascade across all of crypto.
Regulatory Risk
Tether has blocked users in several jurisdictions and has demonstrated willingness to freeze wallets on law-enforcement request (over $1 billion frozen in 2023 alone). The company operates offshore with no single regulator overseeing it, which remains a systemic risk. The EU’s MiCA framework (fully in force December 2024) places hard limits on non-EU stablecoins used in payments — Tether is technically restricted from being used for large-scale payments in the EU under MiCA unless reconsidered.
Related Terms
Sources
- Griffin, J.M. & Shams, A. (2020). “Is Bitcoin Really Untethered?” Journal of Finance, 75(4), 1913–1964.
- NYAG v. iFinex Inc. (2021). Settlement Agreement.
- CFTC v. Tether Holdings Limited (2021). Order and Settlement.
- BDO Italia (2024). Tether Reserve Attestation Q3 2024.
- Lyons, R. & Viswanath-Natraj, G. (2023). “What Keeps Stablecoins Stable?” Journal of International Money and Finance, 131.