UNUS SED LEO (also widely labeled "Bitfinex LEO Token") (LEO) is a utility token issued by iFinex Inc., the parent company of the Bitfinex cryptocurrency exchange. It was issued cross-chain at launch, with 660,000,000 tokens minted on Ethereum (ERC-20) and 340,000,000 minted natively on EOS; a Tron (TRC-20) bridge representation also exists.
The Ethereum contract is the primary tracked instance for pricing and identity. Holders receive tiered discounts on Bitfinex trading fees based on the amount of LEO they hold.
LEO's core value proposition is its buyback-and-burn commitment, funded by a share of iFinex's revenue. iFinex and affiliates commit to spend a minimum of 27% of iFinex's consolidated gross monthly revenues buying back LEO from the open market and burning it, continuing until no LEO remains in commercial circulation.
iFinex has also committed 80% of Bitcoin proceeds recovered through U.S. court restitution from the 2016 Bitfinex hack toward further LEO buybacks and burns, tying supply reduction directly to that legal process.
LEO is a utility (loyalty) token, not a governance token; it carries no voting rights.
Holders use LEO to receive tiered discounts on trading fees across Bitfinex, and historically on EthFinex and EOSFinex. Discount tiers scale with the amount of LEO held in a user's account, without requiring staking or lock-up.
Circulating supply is approximately 919,864,411 LEO, out of a total supply of about 985.2 million, down from the original 1,000,000,000 minted at the 2019 launch.
Net emission is deflationary: no new LEO is minted, and tokens are continuously bought back and burned, reducing total supply over time.
LEO launched via a 10-day Initial Exchange Offering that closed on May 20, 2019, selling all 1,000,000,000 newly minted tokens at $1.00 each. The offering, pegged 1:1 to USDT, raised the full $1 billion target.
Of the tokens sold, 660,000,000 were minted on Ethereum and 340,000,000 natively on EOS. The raise was explicitly a corporate-liquidity response after Bitfinex's payment processor, Crypto Capital, froze or lost access to roughly $850 million in customer and corporate funds in April 2019, rather than a typical product-funding offering.
LEO exists as an ERC-20 token on Ethereum, the chain used for its pricing and identity. It was also issued natively on EOS at launch, and a Tron (TRC-20) bridge representation exists as well.
LEO does not operate its own blockchain or validator set; issuance across all three chain instances is administered centrally by iFinex rather than through an independent consensus mechanism specific to LEO.
LEO has no dedicated project team; it is issued and administered by the corporate leadership of iFinex Inc. and Bitfinex.
LEO is issued and maintained by iFinex Inc., the privately held parent company of the Bitfinex cryptocurrency exchange and, separately, of Tether Limited, issuer of the USDT stablecoin.
Bitfinex operates as a longstanding, high-volume professional and institutional exchange offering spot trading, margin trading up to 10x, lending, staking, and crypto-payment services.
LEO has no on-chain governance mechanism and is not DAO-governed; supply, buyback policy, and burn decisions are administered unilaterally by iFinex, a private company.
Token holders have no voting rights or formal proposal process. The only cited public accountability mechanism is a transparency dashboard where buyback and burn transactions are reported for verification.
Bitfinex expanded its derivatives offering and obtained a new license on July 22, 2026, broadening the exchange services to which LEO's fee-discount utility applies.
Ongoing priorities center on the pace of U.S. court-ordered Bitcoin restitution from the 2016 Bitfinex hack, 80% of which is committed to further LEO buybacks and burns, alongside the standing revenue-based buyback program.
CertiK audited the LEO contract in May 2019 using static analysis and manual review, finding zero issues across all severity levels and assigning a Skynet Score of 86.15 (Grade A).
On Ethereum, the tracked holder base numbers 3,749 addresses, with holdings concentrated among a small number of large wallets, including iFinex-controlled treasury and bridge-related addresses.