This document outlines the objectives of the SIF, the ecosystem required to achieve these goals, and a proposal from the SIF Technical Support Team (MCII, UNEP FI PSI Initiative, V20 Finance Advisor) for building and operationalizing the SIF Ecosystem. It introduces the V20 Group's rationale and objectives for the SIF, presents a draft theory of change, and identifies the beneficiaries and target groups, with a focus on vulnerable countries and MSMEs. The document details the necessary ecosystem, including activities and actors, and concludes with an interpretation of the ecosystem by the SIF Technical Support Team.