Datasets

REST API for stocks, forex, crypto, and technical indicators. Free tier limited to 25 requests per day.

No official public API. Unofficial libraries (e.g. yfinance, which says it is "not affiliated, endorsed, or vetted by Yahoo") call undocumented endpoints. Yahoo's Terms of Service prohibit accessing or collecting data from its services by automated means (robots, spiders, scrapers) "for any purpose without our express, prior permission."

REST and WebSocket APIs for stocks, options, forex, and crypto with fundamentals and market news.

REST API for US stocks, fundamentals, earnings, and financial news. SERVICE DISCONTINUED: IEX Cloud was retired on August 31, 2024.

REST API for stocks, ETFs, crypto, and financial news. Flat-rate pricing with no hidden usage charges.

REST API for end-of-day and intraday prices, fundamentals, news, and macro data across global markets.

REST and WebSocket API for stocks, forex, crypto, ETFs, and bonds with 100+ technical indicators.

Market data APIs for historical and live normalized exchange data, with HTTP historical API and live streaming, plus official client libraries for Python, C++, and Rust.

REST and WebSocket API for stock prices, company fundamentals, estimates, news, and alternative data. Free tier with 60 API calls per minute.

REST and WebSocket API for US stocks, crypto, and options with a free Basic plan. Free real-time equities = IEX only; options = indicative feed; 30 WebSocket symbols; history since 2016 (latest 15 minutes of historical data restricted on Basic).

Weekly positioning data from the U.S. Commodity Futures Trading Commission: open interest in futures and options-on-futures markets broken down by trader group (commercial vs non-commercial, plus disaggregated and financial-futures categories) for every market where 20 or more traders hold positions at or above the CFTC's reporting levels. Aggregates only; individual traders are not identified. Free public API (Socrata), no key or signup.

Free, open-source exchange-rate API: daily mid-market rates for 228 currencies (including legacy codes) from 106 central banks and official sources. No API key, no signup, no daily or monthly caps.

Free T+1 downloads of IEX Exchange's recorded TOPS and DEEP US equities feeds as pcap files: IEX's own trading only, not the consolidated tape. The index and files download without a key (checked Oct 27, 2026). IEX requires a citation if you distribute or provide access to it.

Japan Exchange Group's J-Quants API: daily prices, valuation indicators, financial summaries and earnings dates for Tokyo Stock Exchange stocks, from JPX Market Innovation & Research. The Free plan costs ¥0 and gives 2 years of history, 12 weeks delayed, at 5 calls a minute. Private use by individuals only (checked Oct 28, 2026).

Nasdaq's data platform for financial, economic and alternative datasets, delivered by API with Python, R, Excel and SQL tools. Formerly Quandl: Nasdaq bought Quandl in 2018 and relaunched its platform as Nasdaq Data Link in September 2021.

Community-uploaded datasets for machine learning and research. Download via web or CLI; quality varies. Each dataset has its own license.

REST API for alternative data including congressional trades, insider transactions, lobbying, and government contracts. Website is free to browse; API requires paid subscription.

Open global news-event database from the GDELT Project: events, article mentions and a knowledge graph of people, organizations, places, themes and tone, extracted from news worldwide and published as free raw files every 15 minutes. No key or signup; free for commercial use with a citation and link to gdeltproject.org.

Free, official page-view counts for Wikipedia and other Wikimedia projects from the Wikimedia Analytics API: daily or monthly views for a single article, plus project-wide totals. No API key; a descriptive User-Agent header with contact details is required.

Platform aggregating 600+ databases including Compustat, CRSP, TAQ, and IBES for academic research.

Free downloadable CSV/TXT files of Fama-French factor returns and research portfolios. No API, no key required; direct file downloads from Dartmouth Tuck School of Business.

REST and WebSocket API covering crypto assets, DEX data, and 12+ years of historical market data.

REST and WebSocket API for crypto and DEX market data. Free Basic tier plus four paid tiers. A keyless public API with no signup also exists for quick tests, but its terms are Not stated, and because keyless calls share an IP-based rate pool, a call from a shared cloud IP can be refused straight away (we saw this when we tested); use a free key for anything real.

REST and WebSocket APIs for spot, futures, and margin trading on Binance. No authentication required for market data. Subject to weight-based rate limits.

REST API from the Federal Reserve Bank of St. Louis covering economic indicators and financial time series.

Official World Bank Indicators API (V2, https://api.worldbank.org/v2): nearly 16,000 development and macro time-series indicators from over 45 databases, including World Development Indicators for 217 economies and more than 40 country groups. No API key; XML by default (JSON with format=json), plus CSV, XML or Excel ZIP downloads.

Official REST API from the U.S. Bureau of Labor Statistics for inflation, employment, and wage data. Public domain.

Official open API from the U.S. Treasury's Bureau of the Fiscal Service: federal debt, daily cash and debt operations, receipts and outlays, average interest rates on Treasury securities, auction data and the Treasury's reporting exchange rates for foreign currencies. No API key, account or registration; JSON, CSV or XML.

Official Bank of Canada API for daily exchange rates, interest rates, bond yields and other financial and economic statistics. No API key, no registration, no cost.

U.S. Energy Information Administration's open data: electricity, natural gas, petroleum, coal, nuclear outages and energy outlooks through an API (free key) and bulk files (no key). Includes some natural gas and petroleum prices. EIA states the data is provided free of charge (checked Oct 28, 2026).

REST API for US equities, fundamentals, options, and real-time prices. Credit-based usage model.

REST API providing fundamental data with calculated ratios and metrics. Python library and Excel plugin available. Freemium model with paid tiers.

Official SEC REST/JSON APIs for filing history and XBRL financial data. No API key required; SEC's fair-access policy sets a maximum of 10 requests per second, and SEC asks you to declare a User-Agent with contact details.

REST API for financial statements, stock prices, analyst estimates, and market data. Free tier available with 250 API calls per day.

Desktop platform for real-time financial data, news, analytics, and trading. API access via BLPAPI or Data License.

Desktop platform for financial data and analytics. Eikon was withdrawn June 2025; replaced by LSEG Workspace. API access via LSEG Data Libraries.