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Alpha Vantage
Stocks · Crypto · Forex · Economic
Free API covering stock prices, revenue, earnings, crypto, and forex going back 20+ years. One of the most complete free financial data APIs available. Requires a free API key.
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FRED
U.S. Economy · Inflation · Employment
Federal Reserve Economic Data with 800,000+ time series from the St. Louis Fed. The go-to for U.S. macroeconomic indicators: GDP, CPI, unemployment, interest rates, and more. Free, no key required.
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World Bank
Global · GDP · Development · Population
Comprehensive data on hundreds of countries covering GDP, poverty, trade, education, health, and more. Great for cross-country comparisons and long historical trends. Free and open access.
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Our World in Data
Health · Energy · Demographics · Climate
Research-backed datasets on global issues: life expectancy, CO₂ emissions, energy use, education, and much more. Thousands of indicators spanning decades. Free and open access.
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Basketball-Reference
NBA · Every season since 1947
The complete NBA and BAA record book. Powers Heartbeat's all-time franchise races and the all-time triple-double board, and repairs the game-by-game files back to 1984-85 — every player's season totals for the club they actually played for, so a mid-season trade credits the right team. Read from public-domain and MIT republications, never scraped; charts built from it are credited to Basketball-Reference automatically. Full licence list:
THIRD-PARTY-DATA.md.
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NBA.com
NBA · Game by game · Playoffs
The league's own box scores, every game from 1988-89 on. Powers Heartbeat's game-by-game races and the playoffs mode, so a season plays out night by night instead of one bar per year. Every season is checked against the official record book before it ships — the year's top 60 scorers have to match on points and games played exactly — and earlier seasons are offered year-by-year instead, where the numbers are exact. Charts built from it are credited to NBA.com automatically.
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FiveThirtyEight
NBA · Team game by game · 1946 on
FiveThirtyEight's Elo project published the result of every NBA and BAA game ever played, both scores included, under a Creative Commons Attribution 4.0 licence. Heartbeat uses it for the 25 seasons where the league's own box scores don't add up to the official record book — an independent reconstruction that does. Charts built from those seasons are credited to FiveThirtyEight, as that licence requires.
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Pro-Football-Reference & nflverse
NFL · Every season since 1950
The NFL record book, end to end. Pro-Football-Reference covers 1950 through 1998 and the open nflverse project carries it forward, so a single chart can run from Otto Graham to Patrick Mahomes. Charts name whichever source they used — and both, when a range spans the two.
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Excel / CSV
CoinGecko
Cryptocurrency · Market Cap · Volume
Historical price and market cap data for thousands of cryptocurrencies. One of the most reliable free crypto data sources available. Export to CSV and upload directly to Heartbeat.
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Excel / CSV
Statista
Industry · Market Size · Surveys
Aggregated statistics across thousands of industries and topics. Great for market share charts, consumer trends, and social media stats. Some data requires a paid plan, but many charts are free.
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Excel / CSV
U.S. Census Bureau
Population · Housing · Demographics
Official U.S. government statistics on population, income, poverty, housing, and business. Deep historical records and detailed breakdowns by state and county. All free.
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Excel / CSV
Kaggle Datasets
General · Sports · Science · Finance
A massive community-contributed dataset library covering almost any topic imaginable: sports stats, scientific measurements, financial data, and more. Free to download after a free account signup.
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Excel / CSV
Google Trends
Search Interest · Topic Popularity · Trending
Track how search interest in any topic has changed over time, broken down by region or category. Great for visualizing cultural moments, brand awareness, or trending topics. Export as CSV and upload directly.
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Excel / CSV
Gallup
Public Opinion · Well-being · Workplace · Politics
Decades of polling data on public opinion, approval ratings, happiness, employee engagement, and more. Great for visualizing how sentiment on any topic has shifted over time. Data available to download directly from their site.
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