Open APIs for Investing: Financial Data & Stock Research (2026)
Compare open APIs for investing, stock market data APIs and open-source finance tools by access, coverage, use case and implementation risk.
12 resourcesChoose a reliable starting point
Guide updated · 2026-07Backtrader
A Python framework for expressing, testing and visualizing rule-based trading strategies on historical data.
FinRL
An open-source framework for experimenting with deep reinforcement learning agents in financial markets.
FRED API
A trusted macroeconomic API for interest rates, inflation, employment, credit and thousands of economic time series.
IMF Data API
Cross-country macro, balance-of-payments, fiscal and financial statistics distributed through standard data services.
Microsoft Qlib
An AI-oriented quantitative investment platform spanning data processing, model training, backtesting and research workflows.
OpenBB Platform
An open-source financial data platform that provides a common interface across public, licensed and proprietary providers.
OpenFIGI API
A security-identifier mapping service for translating tickers, ISINs and other IDs into FIGI records.
QuantLib
A mature open-source library for instrument pricing, term structures, risk management and quantitative finance.
SEC EDGAR API
The primary public source for U.S. company filings, XBRL facts, insider forms and institutional disclosures.
Treasury Fiscal Data API
Machine-readable U.S. federal debt, interest expense, revenue, spending and auction datasets.
World Bank Indicators API
Open global development data covering GDP, demographics, trade, debt and country-level economic indicators.
yfinance
A popular Python wrapper for convenient access to Yahoo Finance market and company data.