Proof of Usefulness Report
finprim
Analysis completed on 6/1/2026
+66
Proof of Usefulness Score
You're In Business
finprim solves a genuine fragmentation problem in fintech development by providing a unified, zero-dependency validation library. Technical execution and type safety are strong, but verifiable user traction, active users, and audience reach are currently minimal as it is an early-stage open-source project.
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Score Breakdown
Real World Utility+21.25
Audience Reach Impact+4.00
Technical Innovation+12.00
Evidence Of Traction+7.50
Market Timing Relevance+8.50
Functional Completeness+6.75
Subtotal+60
Usefulness Multiplierx1.1
Final Score+66
Project Details
Project URL
Description
finprim is an open-source TypeScript library of financial primitives — IBAN, BIC/SWIFT, card, sort code, VAT, and routing number validators plus loan math and currency formatting. One unified API, zero runtime dependencies, branded types for compile-time safety, with optional Zod, React, and NestJS integrations. It replaces the fragmented in-house validation code every fintech team ends up rewriting.
Audience Reach
Published on npm (package: finprim) with public download stats and an open GitHub repository. Targets the global TypeScript/JavaScript fintech ecosystem — any team building payments, banking, billing, lending, or compliance features. Validators cover 80+ countries (IBAN), all major card networks, EU VAT, UK sort codes, and US ABA routing numbers, making it relevant to developers worldwide.
Target Users
Fintech engineers, payment platform teams, neobanks, accounting/invoicing SaaS, lending products, and any TypeScript developer who needs to validate or format financial data (IBANs, BIC/SWIFT, cards, sort codes, VAT numbers, routing numbers) or compute loan/EMI schedules. Equally useful for backend services (NestJS pipes, Zod schemas) and frontend forms (React hooks)
Technologies
Other
Traction Evidence
Live on npm with public install metrics: https://www.npmjs.com/package/finprim
Open-source on GitHub: https://github.com/tintolee/finprim
Currently at v0.1.4 with active releases, OIDC trusted publishing, and provenance attestation
Zero-dependency, tree-shakeable ESM + CJS build — production-ready
Optional first-class integrations already shipped for Zod, React, and NestJS
Demo app included in the repo showcasing real-world usage (card validation, IBAN, currency)
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