Myriad Voids 10 Prediction Markets After Attack; Affected Users to Receive Automatic Refunds

TechFlow news: On October 28, according to The Defiant, prediction market platform Myriad Markets confirmed that its internal admin wallet used to automatically create and resolve certain markets had been compromised. On October 26, an attacker used the wallet to manipulate the outcomes of 10 prediction markets and claim payouts, involving topics such as OpenAI and Anthropic IPOs, whether Base will issue a token in 2026, and the U.S. midterm elections. Myriad subsequently revoked the wallet's admin permissions and announced that the affected markets were voided.

The platform said it has recovered the funds and will automatically refund users holding positions on both outcomes based on the last price of each outcome before the attack, deducting any related payouts already claimed. Users do not need to submit a request. The vulnerability was attributed to a security issue in a third-party library used by a backend service weeks earlier. Although Myriad said the attacker failed to withdraw the funds, on-chain records show that the related funds were transferred to other addresses, and their final destination cannot be confirmed based on this.

Source: TechFlow