Abstract: The present disclosure relates to methods and systems for online trading. Embodiments of the disclosure may retrieve transaction data indicating trading activities associated with a first user and estimate a winning probability of a future trade to be made by the first user based on the transaction data. Some embodiments may also present the winning probability to a second user and receive a following order from the second user to follow the future trade of the first user. In addition, some embodiments may associate the following order with the first user and detect a triggering order placed by the first user. The triggering order may include a trading characteristic associated with the winning probability. Moreover, some embodiments may execute the following order in synchronization with execution of the triggering order.