MainStreet is a technology company based in San Jose, California, that operates a B2B Software-as-a-Service (SaaS) platform designed to assist startups in identifying and claiming government incentives, tax credits, deductions, and stimulus programs. Founded in 2019, MainStreet's software connects with clients' payroll systems to automate the data collection necessary for qualifying for various financial programs, ultimately helping to save time and money. The platform is tailored for startups at various stages of growth, including bootstrapped, pre-seed, seed, and series funding rounds, across multiple industries such as software, hardware, biopharma, biotech, aerospace, materials, and manufacturing. MainStreet charges a flat success fee based on the incentives disbursed to its clients and is supported by notable investors in the venture capital space.