If your Python project is built on company numbers rather than ticking prices, start with ROIC.ai . That is my short answer, and the rest of this guide explains why, where it falls short, and which other stock market APIs make more sense when your project looks different.

Almost everyone starts the same way, by the way. Three lines with a popular library, a neat table in the terminal, one proud afternoon. Then the script runs on a schedule, an unofficial endpoint changes, and the dashboard is dead on a Monday morning. This guide is for the day after that.

Quick picks 🏆

Fundamentals, ratios, transcripts: ROIC.ai (top pick)

Live US data and options: Massive

Trading bots: Alpaca

Global history: EODHD

Learning on a free key: Alpha Vantage or Twelve Data

Free live US quotes: Finnhub

Personal notebooks only: yfinance

💡 Tip: Pricing in this market moves without warning. Everything here was checked against public pages and recent developer write ups in October 2026.…