Decentralized exchange Arcus, operating on the Robinhood Chain, identified and resolved an accounting bug that allowed an unauthorized withdrawal of funds. The platform discovered the issue on November 9 and implemented a patch within one hour.
The exchange covered the resulting shortfall of approximately $2 million using its own treasury reserves. Arcus confirmed that no customer balances were impacted by the incident, and all trading and withdrawal services remain operational.
The platform, launched in beta around June or July 2026, specializes in tokenized stock trading and cross-margined perpetual futures with up to 50x leverage. It was developed by the dYdX team in partnership with Robinhood Crypto.
The incident occurred shortly after the exchange expanded its multi-asset collateral support for all traders between November 5 and November 7. Arcus has not yet confirmed a link between the new feature rollout and the accounting error.
