# Ostium

> 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.

- **Founded:** 2023
- **Headquarters:** London, United Kingdom
- **Founders:** Kaledora Kiernan-Linn (Co-founder & CEO), Marco Antonio Ribeiro (Co-founder & CTO)
- **Team size:** ~29 employees
- **Products:** Ostium Perpetuals Exchange, Synthetic RWA Perps, OLP Liquidity Vault, Custom RWA Oracle, Points Program
- **Notable:** Raised $20M Series A co-led by General Catalyst and Jump Crypto (December 2025), bringing total funding to ~$27.8M., Reached a reported valuation of ~$250M., Captured more than 50% of total onchain gold perpetual open interest during the 2025 gold rally.

## Products & services

- **Ostium Perpetuals Exchange** — A decentralized exchange on Arbitrum for trading perpetual swaps on real-world assets - stocks, commodities, indices, forex and crypto - with up to 200x leverage, fully self-custodial.
- **Synthetic RWA Perps** — Synthetic perpetual contracts that track real-world prices (e.g. gold, oil, S&P 500, EUR/USD) rather than tokenized assets, settled in USDC.
- **OLP Liquidity Vault** — A liquidity pool where users deposit USDC to back trader positions and earn fees and yield, with optional locking periods for boosts.
- **Custom RWA Oracle** — A pull-based oracle system designed for real-world assets that handles market hours and asset-specific logic, paired with Chainlink Data Streams for crypto.
- **Points Program** — A weekly points program rewarding trading activity, liquidity provision and referrals.
- **Onchain Equity & 0DTE Perps** — Onchain equity perpetuals powered by Nasdaq data and 0DTE-style stock perps positioned as an alternative to options and CFDs.

## Achievements

- Raised $20M Series A co-led by General Catalyst and Jump Crypto (December 2025), bringing total funding to ~$27.8M.
- Reached a reported valuation of ~$250M.
- Captured more than 50% of total onchain gold perpetual open interest during the 2025 gold rally.
- Reported $25B-$51B+ in cumulative trading volume, including ~$5B in metals trading.
- Grew to 26,000+ active traders.
- Integrated Nasdaq data to launch onchain equity perpetuals (2026).

## Latest updates

- **2026-05** — Ostium integrated Nasdaq data to power onchain equity perpetuals.
- **2025-12** — Closed a $20M Series A co-led by General Catalyst and Jump Crypto, with a $4M strategic round, at a ~$250M valuation.
- **2025** — Reported surpassing $51B in cumulative volume and 26,000+ active traders; dominated onchain gold perp open interest during the gold rally.

## Links

- Website: https://ostium.com
- LinkedIn: https://www.linkedin.com/company/ostium-labs
- Twitter/X: https://twitter.com/ostiumlabs
- GitHub: https://github.com/0xOstium

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Profile page: https://yespress.io/ostium
Published by YesPress — https://yespress.io
Last updated: 2026-06-13