Shoppers in markets like Brazil face unpredictable final costs due to hidden fees and payment method disparities. A localized aggregator could show true total costs across platforms.
Build a web app that scrapes major marketplaces, calculates final delivered prices including local taxes/payment fees, and highlights payment options like installment plans.
Monetize through affiliate programs and sponsored merchant placements.
MVP: Web scraper for 2-3 major platforms in one country with basic comparison view.
Risk: Platform API restrictions and rapid pricing changes.