Aster launches BubbleMaps (BMT) and launches dual reward activities for spot and perpetual contracts According to Aster's announcement, BAster has launched the BubbleMaps token BMT and launched a dual reward activity for spot and perpetual contracts. The activity period is from 20:00 on January 29th to 22:00 on February 5th. The perpetual contract reward is based on the user's OI score (holding size x holding time), and a minimum holding time of 15 minutes is required to qualify. The spot reward is based on the proportion of transaction fees incurred by the user in that trading pair. The maximum reward for a single user is 3% of the total reward pool, and a minimum of 1 token reward can only be obtained if the transaction fee exceeds $5.