Indian B2B supply chains are highly fragmented, with last-mile (deep-tier) SMEs historically underserved in terms of credit needs. However, the rapid digitization of these supply chains is creating new opportunities for fintechs to deliver flow-based credit with profitable unit economics.Three main archetypes of fintech plays are emerging to serve deep-tier SMEs in digital supply chains: Anchor-led play, Commerce-led play, Software-led play. Each archetype requires fintechs to develop specialized capabilities and offerings for SMEs. The potential is significant: digitization of B2B supply chains in India could unlock supply chain credit revenue of $10-11 billion and an insurance opportunity of $0.2-0.3 billion by FY30.