Building a Finviz Alternative With Claude Code and EODHD API
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Building a Finviz Alternative With Claude Code and EODHD API

Most investors think they need more tools to make better decisions. The truth is different. If you're screening stocks across multiple sources, checking sector performance on a separate site, or tracking ideas in a spreadsheet that's always out of date, you don't have a tools problem. You have a fragmentation problem.

A typical investing workflow looks like this:

  • Finviz for screening stocks
  • Yahoo Finance for company information
  • TradingView for charts
  • Another site for market breadth
  • Excel for tracking ideas

Too many tabs. Too much context switching. The more fragmented the workflow, the harder it is to spot opportunities. So instead of opening five different tools every morning, I built one: FinView, an open-source Finviz alternative powered by Claude Code and the EODHD API.

The Real Problem Isn't Data - It's Structure

Developers building their own stock market dashboard usually hit the same wall. Data is scattered across providers. Real-time prices come from one source, fundamentals from another, historical data from a third. Stitching that together used to take weeks.

The real problem isn't a lack of financial data. It's the lack of a single, reliable source feeding a clean structure. That's the gap FinView was built to close: one dashboard, one API, every workflow a Finviz user expects.

What FinView Includes

The goal was simple: answer five questions without leaving one screen.

  • What is the market doing today?
  • Which sectors are leading?
  • What stocks have unusual volume?
  • What companies deserve deeper analysis?
  • Is the market bullish or bearish?

1. Real-Time Market Dashboard

The homepage gives an instant read on market conditions:

  • S&P 500, Nasdaq, Dow Jones, Russell 2000
  • Market breadth indicators
  • Advance/decline ratios
  • Bull vs. bear sentiment

Before looking for opportunities, you need to understand the environment. This section does that in seconds.

2. Stock Screener

Finviz's screener is its most-used feature, so FinView needed the same logic. Users can filter stocks by:

  • Price
  • Volume
  • Relative performance
  • Technical signals

Instead of manually scanning charts, the screener surfaces stocks hitting new highs, showing unusual volume, or leading the day's gainers and losers - instantly.

3. Sector Heatmap

This is the feature that does the most work with the least effort. A heatmap makes rotation visible at a glance: technology weak, utilities strong, financials leading, industrials outperforming. One visualization often reveals more than three market reports combined.

4. Company Detail Pages

Finding a stock is only step one. Understanding it is where decisions actually happen. Each company page shows market data, fundamental metrics, historical performance, and key company information - creating a clean path from discovery to analysis.

How Claude Code Changed the Build

The interesting part wasn't the dashboard. It was the process. Five years ago, a project like this meant:

  • Frontend development
  • Backend architecture
  • Database design
  • API integrations
  • UI design and testing

Weeks, sometimes months, of work. With Claude Code, most of that repetitive implementation got handled automatically. I focused on product design, architecture decisions, and data integration instead. This doesn't replace software engineering. It removes the boilerplate so the engineering that matters gets more attention.

Connecting the EODHD API

A dashboard is only as good as its data feed. FinView needed one provider that covered real-time prices, historical data, fundamentals, and global market coverage - without juggling three separate integrations. This is where the EODHD API fits in. It provides:

  • Real-time market data
  • Historical price data
  • Company fundamentals
  • Market indices and sector data
  • Global exchange coverage

A simplified example of pulling stock data:

import requests

API_KEY = "YOUR_API_KEY"
symbol = "AAPL"
url = f"https://eodhd.com/api/real-time/{symbol}?api_token={API_KEY}&fmt=json"
data = requests.get(url).json()
print(data)

From here you can build:

  • screeners
  • alert systems
  • AI trading agents

Looking for one API instead of five? EODHD gives you real-time prices, fundamentals, and historical data in a single REST API - no scraping, no rate-limit roulette.

→ Explore EODHD APIs

Building the Market Overview

indices = ["^GSPC", "^IXIC", "^DJI", "^RUT"]
for symbol in indices:
    data = get_market_data(symbol)
    print(symbol, data["close"])

This powers the market snapshot at the top of the dashboard.

Building the Screener

filtered = []
for stock in stocks:
    if stock["volume"] > 1_000_000 and stock["change_percent"] > 5:
        filtered.append(stock)
print(filtered)

The production version supports far more filters, but the logic stays the same: retrieve data, apply conditions, display opportunities.

Why This Project Is Open Source

Developers learn faster from real projects than from documentation alone. The FinView repository demonstrates:

  • Claude Code development workflows
  • EODHD API integration patterns
  • Dashboard and screener architecture
  • Sector heatmap logic

If you're learning AI-assisted development or evaluating financial data APIs, it's a practical reference, not just a writeup.

The Real Lesson Wasn't About Stocks

It was about leverage. AI development tools are changing the economics of building software. The gap between "I have an idea" and "I have a working product" is shrinking fast. Individual developers can now ship what used to require a full team. That shift changes who gets to build fintech tools - not just who gets to use them.

FAQs

❓ Is FinView production-ready?
✅ It's primarily educational and experimental, but the architecture is solid enough to serve as a foundation for more advanced trading or research platforms.

❓ Which technologies were used to build it?
✅ Claude Code for development, the EODHD API for market data, and JavaScript/HTML/CSS for the frontend.

❓ Can I build a similar dashboard without AI tools?
✅ Yes. AI mainly reduces development time and automates repetitive implementation - understanding the underlying logic still matters.

❓ Why not just use Finviz?
✅ Finviz is a solid product. This project exists to learn AI-assisted development and build a customizable, open-source alternative you fully control.

❓ Is there a free tier for the EODHD API?
✅ Yes, EODHD offers a free tier suitable for testing screeners and dashboards before scaling to a paid plan.

Final Thoughts

This started with one question: can Claude Code help build a Finviz-style platform from scratch? The answer was yes. The bigger realization was this: the future belongs to people who combine AI tools, reliable data sources, and domain expertise. When those three line up, the speed of creation becomes extraordinary.

Explore the code, contribute, or build your own version: FinView on GitHub

Want the data layer behind FinView? Get real-time and historical market data, fundamentals, and global coverage through one simple API.

→ Start with EODHD

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