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Ostium Halts Trading After an Oracle Attack Drains About $18 Million

An attacker reportedly manipulated Ostium’s registered price-reporting infrastructure with future-dated oracle data, making trades appear profitable and triggering an approximately $18 million USDC payment from its Arbitrum liquidity vault. CoinDesk reported the mechanism and onchain evidence; The Block reported that Ostium paused trading while funds were dispersed across wallets.

PriorityURGENT89.6

First detected5d ago

Last development5d ago

Event date2026-07-15

Sources (2)

Origin

coindesk.comweb_articleindependent
CoinDesk — Ostium suffers $18 million exploit as oracle attack wave continues to hit DeFi5d ago · open ↗

Confirmation

theblock.coweb_articleindependent
The Block — Ostium pauses trading after apparent $18 million vault exploit5d ago · open ↗