Aster has introduced AOS-1, the first module of its Aster Open Standards (AOS), facilitating permissionless spot token listings. This development allows new tokens easier access to the Aster Spot market. To boost trading depth and liquidity, Aster has implemented a -0.25 basis points maker fee for AOS-1 trading pairs, effectively providing a rebate to market makers upon order execution. Aster CEO Leonard highlighted that AOS aims to integrate self-custody and permissionless deployment at the protocol level. AOS-1 sets a standardized framework for open spot listings, encouraging more liquidity providers to engage in on-chain market making through its rebate mechanism.