This policy paper focuses on evidence-based interventions focused on hidden middle interventions that aim to improve smallholder participation in agrifood markets, focusing on mechanisms that enhance income, reduce losses, and support food security. The analysis covers post-harvest infrastructure interventions (storage, cold chains, transport, and processing), market integration mechanisms (contract farming, commercialization incentives, and producer clustering), and the role of intermediaries, wholesale systems, and food retail. It also examines multi-stakeholder partnerships as cross-cutting enablers. Evidence on the midstream segment is scarce, fragmented, and rarely disaggregated. Few interventions explicitly target midstream actors, and even fewer provide clear insights into the effects of these actions in isolation from broader programs. Reviewed studies suggest that isolated interventions often yield uneven or unsustainable results. Durable impact depends on bundling services, addressing structural barriers, and embedding solutions in inclusive, locally grounded governance arrangements.