Market Data API & Stock API

What is a financial data API and what can I do with it?

A financial data API lets you programmatically access stock prices, company fundamentals, economic indicators, and other market data through simple HTTP requests. Common use cases include algorithmic trading, portfolio tracking, financial modeling, academic research, and building fintech applications. EODHD provides all of this through a single REST API with JSON responses — covering 60+ exchanges, 150K+ tickers, 30+ years of historical data, fundamentals, options, bonds, forex, crypto, and macroeconomic indicators.

Is there a free stock market API I can use without a credit card?

Yes. EODHD offers a free stock market API plan with 20 API calls per day. It includes end-of-day historical data and limited fundamentals for US exchanges. No credit card required — register and get your API key instantly. The free plan is suitable for learning, prototyping, and academic projects. Upgrade anytime to access real-time data, full historical coverage, and higher rate limits.

How do I get real-time and live market data through an API?

EODHD provides real-time financial data through two methods: REST API for polling and WebSocket for streaming with sub-second latency. Live market data is available for US exchanges (NYSE, NASDAQ), major European and Asian markets, forex, and crypto. Delayed data (15-20 min) is available for additional exchanges at lower cost.

How do I access stock market data in Python for analysis or machine learning?

The official Python financial data library is available via pip install eodhd. It wraps all API endpoints with typed responses and returns pandas DataFrames natively — ready for analysis with scikit-learn, TensorFlow, or matplotlib. Common workflows include backtesting trading strategies, training ML models on historical prices, and building dashboards. Libraries also available for Node.js, R, Java, C#, and other languages.

How far back does historical stock data go?

EODHD provides 30+ years of historical end-of-day data for major US exchanges, with 15-20 years of coverage for most European and Asian markets. Data includes OHLCV (open, high, low, close, volume) adjusted for splits and dividends. Intraday historical data is available in 1-minute and 5-minute intervals. Historical depth matters for backtesting strategies across multiple market cycles, long-term trend analysis, and academic research.

Can I use a financial data API for algorithmic trading?

Yes. EODHD provides the data layer for algorithmic trading workflows: real-time feeds and WebSocket streaming for signal generation, fundamentals for factor-based models, and 30+ years of historical data for backtesting. Paid plans support high-frequency polling with up to 100,000 API calls per day. EODHD delivers the data — you pair it with your execution broker and strategy engine.

Can I connect financial data to AI tools like ChatGPT, Claude, or Copilot?

Yes. EODHD offers several AI integration paths: an MCP Server with 75 tools that lets AI assistants like Claude, Cursor, and Windsurf query live market data directly in conversation; an OpenAPI 3.1 specification for custom GPTs and AI function calling; AI Agent Skills with 72 endpoints for Claude Code, Codex, and other agents; and a ChatGPT Assistant trained on our documentation. Ask your AI to pull fundamentals, compare PE ratios, or analyze macro trends — all in natural language.

What makes EODHD different from other stock market data providers?

Five things set EODHD apart. Pricing: plans from free to €79.99/mo — significantly more affordable than institutional-grade alternatives. Coverage: 60+ exchanges, 150K+ tickers, all asset classes through one API. Historical depth: 30+ years for major markets. Human support: real people respond to technical questions via chat and email. AI-native: the only financial data provider with a full MCP Server, OpenAPI spec, and pre-built AI agent skills. Most providers force you to choose between affordability and data quality — EODHD gives you both.