Is Ostium custodial? Who holds your funds?
No. Ostium is listed as non-custodial: your funds stay in a wallet you control, not with the venue.
Checked 2026-10-16 · 3 sources- Docs say collateral sits in segregated smart contracts. Users connect a Web3 wallet or log in by email, which creates a Privy-managed smart account on Arbitrum that Ostium says does not access user keys.
- Non-custodial does not mean risk-free. Smart-contract bugs, phishing and malicious approvals can still lose funds.
- We list 1 reported incident for Ostium on its legit check.
Sources: Ostium Docs: Fees (live opening-fee table) · Ostium Docs: Welcome to Ostium · Ostium Docs: Connect Your Account. The venue's own page wins if it disagrees with ours.
Ostium
Perp DEX · 0.06% round trip. Ostium is an Arbitrum-based perpetuals venue offering leveraged exposure to 75 pairs across stocks, ETFs, commodities, indices, forex and crypto, settled in USDC against a liquidity vault and hedged off-chain with institutional partners.
Full Ostium sheet: fees, custody, incidents →