What are some alternatives?
Arcadier - Build an online marketplace in minutes, no coding required.
Facebook Design Resources - A collection of free resources made by designers at Facebook
Kreezalid - Marketplace building solution for small to midsize firms
Shopery Marketplaces - Shopery Marketplaces empowers ventures and brands to build and scale their marketplaces through a SaaS solution.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
Airtable API - Create a RESTful API complete with beautiful docs in 30s