Secure API for Real-Time Precious Metal Rate Distribution

Client: Multi-channel precious metals dealer using NetSuite for enterprise resource planning, pricing management, and customer relationship management.

The client needed to distribute real-time precious metal rate information to multiple external systems—partner websites, mobile applications, and third-party integrations—while maintaining strict security controls and usage monitoring.

Partners were requesting rate updates through email or phone calls, creating delays of minutes to hours between rate changes and partner system updates. Staff manually sent rate sheets via email, which introduced data entry errors when partners transcribed values into their systems.

There was no way to control which partners could access which rate types (spot, wholesale, or market rates), creating pricing disclosure concerns. Without authentication or usage tracking, there was no audit trail. The lack of rate limiting meant a single integration could overwhelm the system with requests, impacting performance for all users.

We implemented a secure RESTful API that provides authenticated, real-time access to precious metal rates with granular permission controls and comprehensive usage monitoring.

The API supports multiple specialized endpoints—clients can request only the specific rate type they need (current spot rate, wholesale rate, or market rate), reducing data transfer and improving performance. Each API credential includes checkbox-based permissions controlling access to specific rate types.

Built-in rate limiting enforces configurable request limits per credential (default: 100 requests per 60 minutes), with automatic window reset and detailed error messages. The system automatically updates the "last used" timestamp on each credential, providing instant visibility into which integrations are active.

Technical Implementation

Architecture: SuiteScript 2.1 RESTlet with GET and POST support chosen for cleaner RESTful architecture and built-in HTTP method routing over Suitelet alternatives.

Key Components: API key validation against custom credential records with expiration date enforcement, five independent permission flags providing granular access control, per-credential request counting with rolling time windows, field-specific lookups using search.lookupFields for single-rate requests instead of loading full records, and consistent error response format with HTTP status codes.

Notable Decisions: Permission checkboxes stored on credential records (not as script parameters) for per-client granularity, rate limit tracking uses record.submitFields for minimal governance consumption, the API automatically identifies the newest rate configuration by internal ID descending sort eliminating manual configuration, and the health check endpoint requires authentication but doesn't consume rate limit for monitoring use cases.

• Rate updates propagate to all integrated systems within seconds
• Zero authentication incidents with complete access control audit trail
• Granular permissions prevent pricing strategy disclosure
• "Last Used" timestamps provide instant integration health visibility
• Rate limiting protects system performance with clear retry guidance
• Eliminated manual email distribution process entirely

Key Takeaways

• Credential-level permissions enable different access levels without deploying multiple APIs
• Single-rate endpoints with field-specific lookups reduced response times for the 80% use case
• Rate limiting as a feature enables partners to build smarter polling strategies