Bitfinex is a cryptocurrency exchange founded in 2012, operated by iFinex Inc. (registered in the British Virgin Islands). For much of 2014-2018, Bitfinex was the world’s largest Bitcoin exchange by volume and remained a dominant venue for large-order institutional trading. It is inseparable from Tether (USDT) — both are operated by iFinex, and the Bitfinex-Tether relationship has been the subject of major regulatory investigations, lawsuits, and academic research. Bitfinex pioneered peer-to-peer margin funding (a model where users lend funds to other traders at floating interest rates) and has been at the center of several defining events in crypto history.
History
| Year | Events |
|---|---|
| 2012 | Founded by Raphael Nicolle in Hong Kong; one of the first exchanges to offer advanced trading tools (margin, shorting) |
| 2014 | Wells Fargo relationship provides USD banking; volumes grow substantially; surpasses Mt. Gox as largest BTC exchange following Mt. Gox collapse |
| 2015 | First hack: $1.5M in BTC stolen from hot wallet |
| 2016 | Major hack: 119,754 BTC stolen (~$72M at time; ~$7B+ at later prices). Bitfinex issues “BFX tokens” to affected users representing IOUs; burns all BFX tokens within 8 months by buying them back at face value — unconventional but successful recovery |
| 2017 | Wells Fargo cuts banking relationship; USD withdrawals disrupted |
| 2018 | CFTC investigation of Tether/Bitfinex relationship; relationship between iFinex/Tether becomes clearer to public |
| 2019 | NYAG investigation reveals Bitfinex borrowed $850 million from Tether reserves to cover missing customer funds (Crypto Capital Corp losses); LEO token launched to raise $1B |
| 2021 | US DOJ announces seizure of 94,636 BTC connected to 2016 hack; couple Ilya Lichtenstein and Heather Morgan arrested (2022) as alleged hackers |
| 2022-2024 | Bitfinex largely extricates itself from US legal process; continues operating as major OTC and institutional venue |
| 2025 | Remains significant for large traders; BTC recovered from 2016 hack partially returned to customers |
The 2016 Hack
The Bitfinex hack stands as one of the most consequential events in crypto history:
- What happened: Attackers exploited BitGo multi-sig wallet implementation to steal 119,754 BTC
- Response: Instead of closure, Bitfinex socialized the losses — spreading the loss across all users (~36% haircut on all accounts) and issuing BFX tokens as IOUs
- Recovery: Bitfinex bought back ALL BFX tokens within 8 months at $1 face value — users were made whole
- Later twist: In 2021, DOJ announced it had seized 94,636 BTC from Ilya Lichtenstein and Heather Morgan, who were arrested for the hack; the recovered BTC was distributed back to Bitfinex and its users over subsequent years
LEO Token
When the NYAG investigation revealed Bitfinex had borrowed $850M from Tether to cover losses from missing funds held at payment processor Crypto Capital Corp, Bitfinex launched UNUS SED LEO (LEO) in 2019 — raising $1 billion through a token sale to professional investors.
LEO mechanics:
- Bitfinex commits to buying back LEO monthly using ≥27% of gross revenues
- Additional buybacks from recovered Crypto Capital and 2016 hack funds
- LEO holders receive trading fee discounts
- A deflationary model designed to systematically reduce supply
LEO became one of the highest market-cap exchange tokens and delivered strong returns as buybacks continued.
Tether Relationship
Both Bitfinex and Tether are subsidiaries of iFinex Inc. Tether’s USDT is by far the world’s largest stablecoin. The shared corporate structure has been the subject of major controversy:
- Critics allege Tether prints USDT without proper reserves to buy Bitcoin and inflate prices (research by Griffin and Shams, 2020)
- NYAG settlement (2021): iFinex/Tether agreed to pay $18.5M in penalties and submit to oversight without admitting wrongdoing
- CFTC penalty (2021): $41M fine for Tether misrepresenting its reserves
- Despite investigations, Tether continues to operate and remains the dominant stablecoin
Peer-to-Peer Margin Funding
Bitfinex pioneered an innovative funding approach: instead of the exchange providing margin lending capital, regular users can lend their funds to margin traders at floating market rates. This creates a money market between users:
- Lenders set rate and duration (e.g., 0.02% daily for 30 days)
- Borrowers (margin traders) access the best available rate
- Bitfinex takes a 15% fee on funding earnings
This model generates yield for users who don’t want to trade actively and creates genuine market-determined interest rates.
Common Misconceptions
“Bitfinex collapsed after the 2016 hack”
Bitfinex didn’t collapse — it recovered through BFX tokens and bought them all back within 8 months. The exchange remained operational throughout.
“Tether’s reserves are definitely fraudulent”
Contested. Tether settled with NYAG/CFTC without admitting wrongdoing and now publishes quarterly attestations showing significantly increased reserve quality. Whether past reserve claims were fraudulent remains legally unresolved.
Social Media Sentiment
Bitfinex is simultaneously respected (for operational longevity, hack recovery, institutional trading features) and viewed with deep suspicion (Tether connection, opacity, settled regulatory charges). The “Tether FUD” narrative remains evergreen — the belief that Tether/Bitfinex are central to crypto market manipulation is genuinely widespread among crypto critics, mainstream financial journalists, and some academics. Within the crypto trading community, Bitfinex is known as a superior venue for large OTC-style block trades.
Related Terms
Research
- Griffin, J. M., & Shams, A. (2020). Is Bitcoin Really Untethered? Journal of Finance.
- New York Attorney General. (2021). Attorney General James Ends Virtual Currency Operator Bitfinex’s Illegal Activities in New York. NYAG Press Release.
- US Department of Justice. (2022). Two Arrested for Alleged Conspiracy to Launder $4.5 Billion in Stolen Cryptocurrency. DOJ Press Release.