EOST, EOS Transport, is a terminal digital asset exchange matchmaking engine (referred to as terminal matchmaking engine). It aims at building a basic digital asset exchange high-speed matching engine. It introduces Token economic model of intelligent contract control, and satisfies the high-speed digital asset exchange needs between various DAPP terminals and other terminals through semi-centralized matching mode, so as to realize a digital asset exchange and matching engine without trust. With the development of block chain technology and the increase of public chain platform, we will have more and more demands for cross-chain digital asset exchange. In the later stage, it will be extended to realize the safe exchange of digital assets between chains through multi-chain technology or cross-chain technology. On the basis of meeting the matching between current dapps, os-transport keeps pace with The Times and constantly integrates new technologies and ideas. At the same time, through modular combination, it provides the whole system with great scalability and compatibility. In the early stage, it is based on EOS. In the future, digital asset exchange of public chains such as Ethereum and BTC will be well supported.