We developed and scaled a feature for 3P marketplace sellers to facilitate the adoption of the Pan-European FBA, an EU-wide fulfillment program. The feature is a cost-saving calculator that identifies potential savings for sellers by enabling product listings across the EU, thereby incurring lower fees. This was a problem, as sellers had to align 4 different datasets previously, to get this information before deciding whether to join the program. We utilized a build approach, we started from scratch and led the entire process from inception to the development of the MVP and eventually productionalizing the feature for over 150,000 sellers. This unlocked large holdout brands, such as Instant Pot, and generated $100 million in revenue within a year of the MVP.