Online shoppers frequently get hit with unexpected customs fees that can make international purchases unaffordable. Build a calculator that estimates duties based on product category, origin country, and destination.
Integrate with major ecommerce platforms via browser extension or API. Partner with logistics companies for accurate rate data.
Monetize through affiliate fees from international retailers who want to showcase total-cost transparency to customers.
Start with a simple web calculator for common routes (US-EU, China-US) before building API integrations.
The biggest risk is customs regulations changing frequently, requiring constant data updates.