Unified search across secondhand marketplaces — aggregated listings & alerts

Unified search across secondhand marketplaces — aggregated listings & alerts targets a $4.0B = 200M active secondhand shoppers x $20 ARPU/year (subscriptions + affiliate/referral revenue potential) total addressable market with medium saturation and a year-over-year growth rate of 15-25% (online resale CAGR; marketplace listing volume and buyer activity growing fast).

Key trends driving demand: Resale boom -- consumer preference for sustainable and affordable shopping is driving accelerated adoption of secondhand marketplaces, increasing addressable users.; Cross-platform fragmentation -- buyers shop across many niche apps, creating demand for unified discovery and deduped search experiences.; AI-enabled matching -- advances in computer vision and NLP enable accurate cross-listing matching and automated pricing comparisons at scale.; Mobile-first local commerce -- mobile apps and local shipping options make on-the-go discovery and alerts highly valuable..