APRO attempts to solve not only the issue of the speed of oracle price feeds but also challenges the entire paradigm of data availability in the blockchain world. If its 'use first, verify later' optimistic philosophy can be successfully implemented, then future decentralized applications will no longer be constrained by block time limitations. What we will discuss will no longer be simple cross-chain transactions, but truly cross-chain composite applications, such as playing a game on one chain while being able to dynamically adjust the value of game items by real-time calling financial derivative data from another chain. @APRO Oracle e#APRO $AT