Aster: S3 buyback expenditure around 49.3 million USDT, S4 buyback coming soon Decentralized trading platform Aster announced that the S3 buyback plan is nearing completion, with a total expenditure of 49,299,999 USDT and a total buyback of 47,065,447 ASTER tokens. Additionally, the S4 buyback plan is about to begin, with details on buyback allocation, dates, and addresses to be announced later.