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Ostium halts trading after reported oracle exploit hits OLP vault
Security firms Blockaid and CertiK estimated losses from the apparent oracle compromise at about $18 million to $22 million, prompting Ostium to pause trading and urge users to revoke contract approvals.
Cointelegraph reports that decentralized perpetuals trading protocol Ostium paused all trading after blockchain security firms said an apparent oracle-related exploit affected its OLP liquidity vault.
Blockaid estimated losses at roughly $18 million, while CertiK put the figure at about $22 million. Both firms said the incident appeared linked to a compromise of Ostium’s oracle system, which provides external price data to the protocol.
Ostium said it identified an issue affecting the vault and recommended users temporarily revoke approvals for its contracts while it investigates. The protocol said it has not confirmed the cause of the incident or the reported loss estimates.
Built on Arbitrum, Ostium offers leveraged exposure to 75 trading pairs spanning assets including cryptocurrencies and FX. Cointelegraph also noted that DeFi hacks caused nearly $630 million in losses during April, the highest monthly total since February 2025, with DeFi protocols accounting for the vast majority of that figure.