The dominance of centralized e-commerce giants has historically marginalized Pune’s small-scale retailers (Kirana stores) due to high commissions (25-30%) and "Platform Lock-in." The Open Network for Digital Commerce (ONDC) introduces a decentralized protocol aimed at unbundling the supply chain, allowing local merchants to compete on an even playing field. This 2026 case study of 120 Pune-based micro-enterprises reveals that ONDC integration has increased take-home margins by 15-18% through lower transaction fees (5-8%). Comparative analysis shows that 60% of participating small retailers in the Pimpri-Chinchwad and Kothrud belts reported a doubling of daily order volumes within four months of onboarding. ONDC serves as a "Regulatory and Technical Leveler," shifting the focus from "Platform Power" to "Product Proximity" and price transparency in the Pune Metropolitan Region.