Proof of Usefulness Report

Mercari

Analysis completed on 1/6/2026

+9
Proof of Usefulness Score
You're In Business

The submission presents a critical identity and domain mismatch. While the text describes 'Mercari' (a major public e-commerce company), the provided URL is 'livedoor.com' (a separate web portal), and the description explicitly admits this disconnect. The submitter email is a generic Livedoor address, and the evidence of traction is hyperbolic ('most people') and unverifiable for this specific submission. This appears to be an unauthorized or invalid submission claiming to be a major corporation without proof of ownership.

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Score Breakdown

Real World Utility+2
Audience Reach Impact+1
Technical Innovation+1
Evidence Of Traction+1
Market Timing Relevance+1
Functional Completeness+0
Subtotal+7
Usefulness Multiplierx1.15
Final Score+8

Project Details

Project URL
livedoor.com
Description
Mercari is a Japanese e-commerce company that operates a popular online marketplace app, allowing users to buy and sell a wide range of new and used items. Founded in 2013, Mercari has become one of Japan's largest and most successful mobile-first marketplaces, expanding its reach to international markets, including the United States. The platform is known for its user-friendly interface, secure transaction system, and a vast array of products ranging from fashion and electronics to home goods and collectibles. However, the domain "livedoor.com" is not directly associated with Mercari; Livedoor is a separate Japanese internet service company known for its web portal and blogging services. Therefore, the domain does not align with Mercari's operations.
Audience Reach
everyone
Target Users
everyone
Technologies
Web Development, Payments, Fashion
Traction Evidence
most people have used my product

Algorithm Insights

Market Position
Growing utility with room for optimization
User Engagement
Documented reach suggests active user community
Technical Stack
Modern tech stack aligned with sponsor technologies

Recommendations to Increase Usefulness Score

Document User Growth

Provide specific metrics on user acquisition and retention rates

Showcase Revenue Model

Detail sustainable monetization strategy and current revenue streams

Expand Evidence Base

Include testimonials, case studies, and third-party validation

Technical Roadmap

Share development milestones and feature completion timeline