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CheckRail
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Dashboard
Inspiration
Expanding a marketplace into another country involves more than choosing a payment provider. Businesses must understand whether their existing integration supports the required payment operations, whether the provider can actually perform those operations, and what requirements apply in the target market.
We built CheckRail to bring these separate checks into one evidence-driven assessment process.
What it does
CheckRail is a cross-border marketplace payment expansion readiness platform. It combines three sources of evidence:
- Integration Intelligence: Analyzes the marketplace's source code to identify its payment architecture, implemented operations, and integration details.
- Country Intelligence: Structures relevant business, regulatory, payment, and operational requirements for the target country.
- Provider Verification: Executes real provider Sandbox operations to observe actual capabilities and collect runtime evidence.
AI Gap Analysis compares these findings to identify compatibility gaps, potential risks, missing evidence, and recommended actions. Expansion Readiness brings the assessment together into a final decision-support report.
How we built it
We built CheckRail using React, TypeScript, and Tailwind CSS for the frontend, with Node.js and Express.js powering the backend. PostgreSQL stores project information, integration profiles, verification results, and assessment reports.
We integrated PayPal and Hyperwallet Sandbox workflows to verify provider capabilities through actual API operations. OpenRouter powers the AI analysis, while structured validation and evidence-reference checks help keep generated findings grounded in the supplied evidence.
Challenges we faced
One of the biggest challenges was connecting different types of evidence without treating them as interchangeable. Source-code analysis does not prove runtime behavior, and successful Sandbox operations do not establish production readiness or regulatory compliance.
We also had to handle provider-specific API behavior, country-dependent requirements, incomplete evidence, and large assessment contexts. Building a consistent assessment process while preserving traceability between findings and their supporting evidence required careful backend design.
What we learned
Building CheckRail taught us how to integrate multiple payment systems, work with real Sandbox environments, structure country-specific requirements, and design evidence-driven AI workflows.
Our goal is to make international payment expansion assessments more transparent, traceable, and practical for marketplace businesses.
Built With
- ai
- apis
- css
- express.js
- hyperwallet
- javascript
- jwt
- llm
- neon
- node.js
- openrouter
- paypal
- postgresql
- react
- rest
- sandbox
- tailwind
- typescript
- vite
- zod
