One of the objectives of our research consists in exploring the notions of systemic endogenous optimal currency space, which can be generated not only trade but also other factors. This article brings together several strands of the literature concerning endogenous optimal currency space. We analyze the correlation between the symmetry, flexibility and integration for a better interpretation of their interaction. There different treats regarding the integration opportunity, but we conclude that endogeneity is the catalyst of integration, symmetry and flexibility, its presence enhances their interaction and accelerates the process of forming the optimal space.