According to CoinMeta, the Polymarket platform was attacked by hackers on October 29th, resulting in the theft of approximately 737 user wallets, with a loss amount of around 2.73 million US dollars. Blockchain investigations revealed that the attackers executed nearly 1,000 unauthorized withdrawals within an hour, leading to the loss of funds. The investigation found that the attackers took advantage of valid wallet authorizations rather than vulnerabilities in smart contracts to carry out the withdrawals. This incident has raised concerns about the security of Polymarket, and the platform has announced that it will provide refunds of 3.9 million US dollars to the affected users.