Ostium is an onchain perpetuals exchange built on Arbitrum that lets anyone long or short real-world assets - stocks, commodities, indices, forex and crypto - directly from a self-custodial wallet, with up to 200x leverage and no broker in the middle. Founded by Harvard classmates and former Bridgewater hands Kaledora Kiernan-Linn and Marco Antonio Ribeiro, Ostium uses synthetic perpetuals and a custom oracle system to bring traditional markets onchain. It has processed tens of billions in cumulative trading volume and raised $27.8M total, including a $20M Series A co-led by General Catalyst and Jump Crypto in December 2025.
Will Warren co-founded 0x in October 2016 alongside Amir Bandeali, building the open protocol that became foundational DeFi infrastructure for peer-to-peer trading of Ethereum-based digital assets. A former applied physics researcher at Los Alamos National Laboratory who left a PhD program in structural engineering to bet everything on Ethereum, Warren grew 0x from a whitepaper into a protocol powering billions in DEX volume and a developer platform serving the broadest ecosystem of DeFi apps, wallets, and market makers. In May 2026 he stepped down as Co-CEO while remaining a major shareholder and board member.