About Page (TEST)
April 23, 2026
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5
min read
About Ostium
Global markets.
No gatekeepers.
Ostium is a self-custodial perpetuals protocol on Arbitrum. Trade stocks, forex, commodities, and indices with up to 200× leverage — straight from your wallet.
$45B+
Trade Volume
$251M+
Open Interest
25K+
Traders
65+
Markets
"We kept getting burned by opaque platforms — accounts frozen, margin confiscated, spreads manipulated. So we decided to build a transparent, self-custodial alternative."
— Kaledora Kiernan-Linn, CEO & Co-founder
Why We Exist
The broker system is broken.
Over 80 million retail traders globally interact with traditional assets through CFD and FX brokers — platforms built on opacity. Funds frozen without cause. Spreads widened in volatility. Accounts closed with no recourse.
The blockchain makes a fundamentally better instrument possible: non-custodial, transparent, and governed by code. Ostium is the infrastructure to make that real — not for crypto insiders, but for any trader who wants access to gold, oil, the S&P 500, or EUR/USD without handing over control of their capital.
Founded in 2022, Ostium launched on Arbitrum with a clear mandate: compete with the Robinhoods, the eToros, the IGs of the world — and beat them on transparency, fairness, and access.
What makes us different
Built for the next generation of traders.
Ostium isn't a crypto DEX that added a few RWA pairs. It's trading infrastructure purpose-built for real-world assets, designed to replace the broken infrastructure of centralized brokers.
01
True self-custody
Your funds never leave your wallet. Ostium cannot freeze positions, restrict access, or confiscate margin.
02
Exchange-licensed price data
A custom RWA price oracle powered by licensed exchange data feeds — tight spreads, no manipulation.
03
65+ markets in one place
Stocks, forex, indices, commodities, and crypto — all under one roof, all settled in USDC on Arbitrum.
04
Up to 200× leverage
Industry-leading leverage across asset classes. Dynamic spreads that tighten in calm markets and widen responsibly under volatility.
The Team
Built by obsessives.
KK
Kaledora Kiernan-Linn
Co-founder & CEO
Kaledora danced professionally with the Royal Danish Ballet before finishing her degree at Harvard, where she studied Neuroscience. She spent years running quant research at Bridgewater Associates and consulting at McKinsey, while running arbitrage strategies against CFD brokers on the side — and losing money to their opacity. That experience became Ostium. Named Forbes 30 Under 30 in Finance, 2025.
Harvard
Forbes 30U30
Ex-Bridgewater
Ex-McKinsey
Royal Danish Ballet
MR
Marco Antonio Ribeiro
Co-founder & CTO
Marco competed internationally in the Science Olympiads in physics, biology, and chemistry before arriving at Harvard. He and Kaledora met in Cambridge, and the two ran arbitrage trading strategies out of a hacker house near campus. He went on to work as an investment associate at Bridgewater Associates before building all of Ostium's smart contracts and the RFQ engine architecture from scratch.
Harvard
Ex-Bridgewater
Smart Contracts
RFQ Architecture
Science Olympiad
Backed By
Serious capital.
Serious conviction.
Lead Investors — Series A
General Catalyst
Tier-1 venture firm · Co-led Series A
Jump Crypto
Crypto arm of Jump Trading · Co-led Series A
Institutional Participants
Coinbase Ventures
Wintermute Ventures
GSR
Crucible Capital
Notable Angels
Balaji Srinivasan
Former CTO, Coinbase
Meltem Demirors
Crypto investor & founder
Nick van Eck
VanEck
0xAnteater
Crypto angel
Company Facts
The essentials.
Founded
2022
Blockchain
Arbitrum (Ethereum L2)
Settlement Currency
USDC
Product Type
Perpetual Swaps — Synthetic Exposure
Custody Model
Fully self-custodial — non-custodial protocol
Max Leverage
Up to 200×, varies by asset
Total Funding
$27.5M raised
Protocol Status
Live on mainnet — open source
Protocol Explorer
Ready to trade without limits?
Connect your wallet. No account. No broker. No frozen funds. Just global markets, onchain.
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