ProxyFinance

Problem

Describe the user pain, gap, or technical challenge that motivated the work.

Solution

A CORS-friendly finance proxy that exposes restricted, purpose-built routes for market data used by price trackers and bots.

Tech Stack

Node.js, HTTP, Yahoo Finance, Gold-API, Frankfurter, Cloudflare Workers

Features

• Yahoo Finance chart proxy
• Gold-API spot and historical proxy
• Frankfurter FX proxy
• CORS and preflight handling
• Health check and usage endpoint

Architecture & Development Process

Challenges

• Avoiding an open proxy while keeping useful finance routes flexible
• Balancing cache duration between freshness and upstream reliability

Lessons Learned

• A narrow proxy surface is safer than forwarding arbitrary URLs
• Useful API wrappers should document their allowed routes directly at the root endpoint

Roadmap

• Add request logging
• Add route-level metrics
• Add optional API key protection