Polymarket, a prediction market platform, is set to upgrade its V2 exchange on April 28 at 19:00 UTC+8. According to Foresight News, the platform will undergo a downtime of approximately one hour during the upgrade. The V1 order book will be cleared, and all pending limit orders will be canceled. Users trading via API are required to update to the latest SDK before the upgrade, as the V1 client will no longer be operational post-upgrade.