Polymarket plans to adjust API trading rules: Taker orders will be irrevocable during a 250 millisecond delay period According to Golden Finance, Polymarket announced that it will adjust its matching order behavior for cryptocurrency or financial market trading through APIs on June 5th. For Taker orders within a 250 millisecond delay window, the new rule is as follows: 1. Once the order passes the preliminary verification and enters the delay window, it will be locked as "pending" and cannot be revoked until the delay ends. Requests attempting to revoke will be rejected and will return 'cannot be revoked as the order is in a pending/delayed state'. 2. The required funds for delayed orders are occupied during the window period, and other orders using the same balance will be verified with the remaining funds. 3. Submitting the same order repeatedly within the delay window will be rejected. 4. Disconnecting or canceling client requests will not terminate delayed orders, and orders will continue to be processed after the delay ends. In other scenarios, the cancellation behavior of orders remains unchanged. For delayed Taker orders that have already been partially suspended, they can still be cancelled according to the original rules.