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Ostium is a decentralized perpetual exchange built on Arbitrum, enabling leveraged trading of real-world assets (RWA) such as stocks, commodities, and forex. Users deposit USDC as collateral, with prices sourced via oracles, while opening, closing, and liquidations are executed automatically by smart contracts. It employs a request-for-quote (RFQ) model with institutional liquidity providers, and incorporates funding fees, rollover fees, and other risk-adjustment mechanisms.
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About Ostium
Ostium is a decentralized perpetual contract exchange built on Arbitrum, focusing on real-world assets (RWA) such as stocks, commodities, forex, and indices. Its core business allows users to trade these traditional assets on-chain with leverage, using USDC as collateral. The platform's key innovation is its 'OLP' liquidity pool, where liquidity providers deposit USDC to act as the counterparty for all trades, enabling direct exposure to traditional markets without intermediaries.
Ostium addresses the market pain point of fragmented access to traditional assets in DeFi. Previously, trading stocks or gold on-chain required complex bridging or wrapped assets, while centralized exchanges posed custody risks. Ostium solves this by offering a single interface for trading multiple asset classes, with self-custody and transparent execution. Its competitive narrative centers on being a 'decentralized execution layer' for global markets, providing institutional-grade liquidity and pricing through a hybrid model that combines on-chain pools with off-chain hedging partners.
In the past six months (March to September 2026), Ostium experienced significant developments. The platform continued to grow its trading volume, surpassing $60 billion in cumulative perpetual volume since launch. However, a major security incident occurred on July 15, 2026, when the protocol suffered an oracle attack due to compromised signing keys. This resulted in approximately $18 million in USDC being drained from the OLP vault. Ostium promptly paused all trading and advised users to revoke contract approvals. The incident highlighted vulnerabilities in oracle security and LP vault risk management, raising questions about the platform's resilience and the adequacy of its insurance coverage. As of early September, no full post-mortem had been published, and the recovery of funds remained uncertain.
Ostium is focused on bringing real-world assets such as commodities onchain. Key milestones include a $20 million Series A led by General Catalyst, which strengthened its capital base; and integration with Nasdaq data to launch onchain perpetual contracts for equities, making it the first onchain venue supported by Nasdaq data. On July 15, 2026, an attacker compromised off-chain price oracle permissions and submitted forged BTC prices ($5,000/$60,000), draining approximately $23.75 million USDC from the OLP vault within five minutes; trader collateral was unaffected. The platform suspended trading, pledged to compensate liquidity providers from its own balance sheet, and resumed operations on July 23. The incident highlighted DeFi's exposure to single-point failures in off-chain infrastructure and carries long-term significance for security governance.
Ostium has made major strides in the past six months. It launched a decentralized execution layer that bridges onchain liquidity with institutional-grade offchain venues, with Jump among its hedging partners. This upgrade replaced the previous public liquidity pool model, enabling dynamic open interest scaling and improved execution quality. The protocol has processed over $50B in cumulative volume and generated $35M in fees, serving 26,000+ traders.
Ostium also closed a $24M funding round, including a $20M Series A co-led by General Catalyst and Jump Crypto, bringing total funding to $27.8M. Looking ahead, Ostium plans to deepen institutional partnerships, expand asset coverage across equities, commodities, FX, and indices, and launch a mobile app. A liquidity event is expected after Season 2's point distribution, with a focus on integrating 24/7 trading capabilities and enhancing cross-margin and trailing stop features.
Co-founder & CEO Kaledora Fontana Kiernan-Linn: A.B. in Neuroscience from Harvard (secondary in Statistics). Professional ballerina with the Royal Danish Ballet (2015–2019), then moved into finance via internships at Bridgewater Associates (with co-CIO Bob Prince), McKinsey, and Verdad Advisers, plus research at the Broad Institute. Co-founded Ostium with Marco in 2022. Named to Forbes 30 Under 30 in Finance, 2025.
Co-founder & CTO Marco Antonio Ribeiro: Harvard dual concentration in Engineering Sciences and Economics (on leave). International Science Olympiad participant. Former investment associate at Bridgewater Associates. At Ostium, he built all smart contracts and the RFQ engine architecture.