Mumbai-based fintech startup OneStack has raised $2 million in a Series A funding round led by Pentathlon Ventures, with participation from Yatra Angel Network, 100Unicorns, and Venture Catalysts. Founded in 2019, the company provides digital solutions for cooperative banks and credit societies, including core banking services and financial integrations. With the new funding, OneStack aims to expand into southern and eastern India, targeting a 20% market share and onboarding 200 additional banks.