The Vercel Marketplace for integrations has been successful in increasing signups for partner platforms like Supabase. Supabase's integration on the marketplace offers a seamless onboarding experience, allowing developers to easily set up and manage databases directly from the Vercel CLI or dashboard. Since its launch, Supabase has seen a significant increase in new signups, making it their largest partner channel. The benefits of Vercel Marketplace integrations include ease of use, frictionless onboarding, and integrated billing. Supabase's adoption by Vercel's developer base has accelerated due to the seamless integration and reduced setup time.