Free Stock APIs
Every API here is free outright or has a free tier. Limits differ a lot, so check the free tier column before you build on one.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
AdanosStock and crypto sentiment aggregated from Reddit, X, news and Polymarket, per ticker. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
Agent ToolbeltAI-generated investment theses, valuations and insider-signal reads for stocks, plus about 20 agent utilities. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
aikstockdataDaily KOSPI/KOSDAQ/KONEX closing prices, DART filings, and earnings as static JSON/CSV. Finance & Commerce › Stock Market | Free | None | JSON | Unlimited | Live |
AletheiaReal-time and statistical stock, bond, option, and crypto quote data by ticker symbol. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
Alpha VantageGlobal stock, forex, and crypto market data with time series, quotes, fundamentals, and technical indicators. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
AlphAIFinancial news enriched with per-ticker relevance scores, sentiment, insider trades and macro events. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
API Ninjas Earnings CalendarPast earnings results and upcoming report dates for 50,000+ tickers, with EPS and revenue actuals. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
Bargo Congress TradesNormalized U.S. Congress stock trade disclosures (STOCK Act) with per-trade price and return since filing. Finance & Commerce › Stock Market | Free | API key | JSON | <100/day | Live |
CongressInvestsUS congressional stock-trade disclosures by member or ticker, pulled from Senate and House filings 4x a day. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
Disclosed CapitolCongressional stock-trade disclosures, politician portfolios, lobbying and contracts as JSON. Finance & Commerce › Stock Market | Freemium | API key | JSON | — | Live |
DrillrSEC and Asian-market filings turned into structured financials, earnings and ownership data by ticker. Finance & Commerce › Stock Market | Freemium | API key | JSON | — | Live |
Earnings FeedReal-time SEC EDGAR filings (10-K, 8-K, Form 4, 13F) with company and insider trading data. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
EOD Historical DataEnd-of-day and historical prices for stocks, ETFs and forex across 60 exchanges. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
Financial DataStock, ETF, crypto, forex, and financial-statement data with a 300-requests-a-day free plan. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
FinBridgeKorean and US company filings, financials, segments, valuation and insider trades from DART/EDGAR. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
FinFeedAPIReal-time and historical stock, currency, SEC filing, and prediction-market data via REST, WebSocket, and MCP. Finance & Commerce › Stock Market | Freemium | API key | JSON | — | Untested |
FinnhubReal-time and historical stock, forex, and crypto quotes plus company fundamentals. Finance & Commerce › Stock Market | Freemium | API key | JSON | — | Live |
Halal TerminalShariah-compliant stock and ETF screening across 5 methodologies, plus Zakat calculations. Finance & Commerce › Stock Market | Freemium | API key | JSON | — | Live |
HeliousUS Treasury yields, auction results with bid-to-cover/tail, and scored economic-release data. Finance & Commerce › Stock Market | Freemium | API key | JSON | 10k+/day | Live |
MarketstackReal-time, intraday, and historical stock prices for 30,000+ tickers, plus SEC EDGAR filing data. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
Massive (formerly Polygon.io)Real-time and historical stock, options, index, forex and crypto market data. Finance & Commerce › Stock Market | Freemium | API key | JSON | 1k–10k/day | Live |
MFapi.inHistorical and latest NAV data for 10,000+ Indian mutual fund schemes, updated daily. Finance & Commerce › Stock Market | Free | None | JSON | Unlimited | Live |
PolymarketReal-time prediction-market data: event odds, prices and order books, plus WebSocket streams. Finance & Commerce › Stock Market | Free | None | JSON | Unlimited | Live |
Portfolio OptimizerRuns portfolio optimization algorithms (mean-variance, risk parity) on asset data you supply. Finance & Commerce › Stock Market | Freemium | None | JSON | — | Untested |
ReturnsviewPrecomputed monthly, quarterly and yearly return heatmaps for 1,494 cryptocurrencies, stocks, ETFs, indices. Finance & Commerce › Stock Market | Free | None | JSON | Unlimited | Live |
SEC EDGAR DataFiling history and XBRL financial statement data for SEC-registered US companies, updated in real time. Finance & Commerce › Stock Market | Free | None | JSON | Unlimited | Live |
SiftingIOReal-time and historical prices for US stocks, forex, crypto, commodities, and DEX trades. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
StockDataReal-time and historical US stock quotes, intraday/EOD data, splits, dividends and global market news. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
StockFitSEC filings turned into financial statements, earnings, ETF holdings and ownership data for US companies. Finance & Commerce › Stock Market | Freemium | API key | JSON | — | Untested |
SugraUnified API across markets, macroeconomics, entity screening, climate, and news, 1,600+ endpoints. Finance & Commerce › Stock Market | Freemium | API key | JSON | <100/day | Live |
TickerLayerUnified quotes, trades and snapshots for stocks, forex, crypto, indices, ETFs and commodities. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
Top 5 StocksAI-ranked stock picks, SEC-filing fundamentals, daily price bars and a proprietary research score. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
Tradestie Reddit Sentiment APITop 50 stock tickers trending on Reddit's WallStreetBets, with a computed bullish/bearish sentiment score. Finance & Commerce › Stock Market | Free | None | JSON | 10k+/day | Live |
TradierUS stock and options market data (quotes, chains, historical) plus brokerage trading via API. Finance & Commerce › Stock Market | Freemium | API key | JSON | — | Live |
Twelve DataReal-time and historical prices, forex, crypto and technical indicators across global markets. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
ValueRayStructured stock and ETF research data: technicals, risk metrics, peer comparisons and market regime signals. Finance & Commerce › Stock Market | Free | API key | JSON | <100/day | Live |
XFINLABMarket news, FinBERT sentiment, AI analyst debate, fundamentals and macro signals per stock ticker. Finance & Commerce › Stock Market | Freemium | API key | JSON | 100–1k/day | Live |
XOOMARSEC/FINRA/CFTC/Fed market data: filings, insider trades, short interest, earnings dates, macro rates. Finance & Commerce › Stock Market | Freemium | API key | JSON | 10k+/day | Live |
ZelothornPlain-language business summaries, latest earnings beat/miss, and SEC filing links for US public companies. Finance & Commerce › Stock Market | Free | None | JSON | 10k+/day | Live |
AdanosFreemiumLive
Stock and crypto sentiment aggregated from Reddit, X, news and Polymarket, per ticker.
API key · JSON
<100/day
OpenAPI spec · llms.txt
Agent ToolbeltFreemiumLive
AI-generated investment theses, valuations and insider-signal reads for stocks, plus about 20 agent utilities.
API key · JSON
<100/day
OpenAPI spec
aikstockdataFreeLive
Daily KOSPI/KOSDAQ/KONEX closing prices, DART filings, and earnings as static JSON/CSV.
None · JSON
Unlimited
OpenAPI spec · MCP server · llms.txt
AletheiaFreemiumLive
Real-time and statistical stock, bond, option, and crypto quote data by ticker symbol.
API key · JSON
100–1k/day
no machine-readable spec
Alpha VantageFreemiumLive
Global stock, forex, and crypto market data with time series, quotes, fundamentals, and technical indicators.
API key · JSON
<100/day
no machine-readable spec
AlphAIFreemiumLive
Financial news enriched with per-ticker relevance scores, sentiment, insider trades and macro events.
API key · JSON
100–1k/day
OpenAPI spec · llms.txt
API Ninjas Earnings CalendarFreemiumLive
Past earnings results and upcoming report dates for 50,000+ tickers, with EPS and revenue actuals.
API key · JSON
100–1k/day
no machine-readable spec
Bargo Congress TradesFreeLive
Normalized U.S. Congress stock trade disclosures (STOCK Act) with per-trade price and return since filing.
API key · JSON
<100/day
OpenAPI spec · llms.txt
CongressInvestsFreemiumLive
US congressional stock-trade disclosures by member or ticker, pulled from Senate and House filings 4x a day.
API key · JSON
<100/day
OpenAPI spec
Disclosed CapitolFreemiumLive
Congressional stock-trade disclosures, politician portfolios, lobbying and contracts as JSON.
API key · JSON
—
OpenAPI spec · llms.txt
DrillrFreemiumLive
SEC and Asian-market filings turned into structured financials, earnings and ownership data by ticker.
API key · JSON
—
MCP server · llms.txt
Earnings FeedFreemiumLive
Real-time SEC EDGAR filings (10-K, 8-K, Form 4, 13F) with company and insider trading data.
API key · JSON
100–1k/day
MCP server · llms.txt
EOD Historical DataFreemiumLive
End-of-day and historical prices for stocks, ETFs and forex across 60 exchanges.
API key · JSON
<100/day
llms.txt
Financial DataFreemiumLive
Stock, ETF, crypto, forex, and financial-statement data with a 300-requests-a-day free plan.
API key · JSON
100–1k/day
no machine-readable spec
FinBridgeFreemiumLive
Korean and US company filings, financials, segments, valuation and insider trades from DART/EDGAR.
API key · JSON
<100/day
MCP server · llms.txt
FinFeedAPIFreemiumUntested
Real-time and historical stock, currency, SEC filing, and prediction-market data via REST, WebSocket, and MCP.
API key · JSON
—
llms.txt
FinnhubFreemiumLive
Real-time and historical stock, forex, and crypto quotes plus company fundamentals.
API key · JSON
—
no machine-readable spec
Halal TerminalFreemiumLive
Shariah-compliant stock and ETF screening across 5 methodologies, plus Zakat calculations.
API key · JSON
—
OpenAPI spec · MCP server · llms.txt
HeliousFreemiumLive
US Treasury yields, auction results with bid-to-cover/tail, and scored economic-release data.
API key · JSON
10k+/day
OpenAPI spec · MCP server · llms.txt
MarketstackFreemiumLive
Real-time, intraday, and historical stock prices for 30,000+ tickers, plus SEC EDGAR filing data.
API key · JSON
<100/day
llms.txt
Massive (formerly Polygon.io)FreemiumLive
Real-time and historical stock, options, index, forex and crypto market data.
API key · JSON
1k–10k/day
OpenAPI spec · llms.txt
MFapi.inFreeLive
Historical and latest NAV data for 10,000+ Indian mutual fund schemes, updated daily.
None · JSON
Unlimited
no machine-readable spec
PolymarketFreeLive
Real-time prediction-market data: event odds, prices and order books, plus WebSocket streams.
None · JSON
Unlimited
llms.txt
Portfolio OptimizerFreemiumUntested
Runs portfolio optimization algorithms (mean-variance, risk parity) on asset data you supply.
None · JSON
—
OpenAPI spec
ReturnsviewFreeLive
Precomputed monthly, quarterly and yearly return heatmaps for 1,494 cryptocurrencies, stocks, ETFs, indices.
None · JSON
Unlimited
OpenAPI spec · llms.txt
SEC EDGAR DataFreeLive
Filing history and XBRL financial statement data for SEC-registered US companies, updated in real time.
None · JSON
Unlimited
no machine-readable spec
SiftingIOFreemiumLive
Real-time and historical prices for US stocks, forex, crypto, commodities, and DEX trades.
API key · JSON
100–1k/day
MCP server · llms.txt
StockDataFreemiumLive
Real-time and historical US stock quotes, intraday/EOD data, splits, dividends and global market news.
API key · JSON
100–1k/day
no machine-readable spec
StockFitFreemiumUntested
SEC filings turned into financial statements, earnings, ETF holdings and ownership data for US companies.
API key · JSON
—
no machine-readable spec
SugraFreemiumLive
Unified API across markets, macroeconomics, entity screening, climate, and news, 1,600+ endpoints.
API key · JSON
<100/day
OpenAPI spec · MCP server · llms.txt
TickerLayerFreemiumLive
Unified quotes, trades and snapshots for stocks, forex, crypto, indices, ETFs and commodities.
API key · JSON
100–1k/day
llms.txt
Top 5 StocksFreemiumLive
AI-ranked stock picks, SEC-filing fundamentals, daily price bars and a proprietary research score.
API key · JSON
100–1k/day
no machine-readable spec
Tradestie Reddit Sentiment APIFreeLive
Top 50 stock tickers trending on Reddit's WallStreetBets, with a computed bullish/bearish sentiment score.
None · JSON
10k+/day
no machine-readable spec
TradierFreemiumLive
US stock and options market data (quotes, chains, historical) plus brokerage trading via API.
API key · JSON
—
no machine-readable spec
Twelve DataFreemiumLive
Real-time and historical prices, forex, crypto and technical indicators across global markets.
API key · JSON
100–1k/day
MCP server · llms.txt
ValueRayFreeLive
Structured stock and ETF research data: technicals, risk metrics, peer comparisons and market regime signals.
API key · JSON
<100/day
OpenAPI spec · llms.txt
XFINLABFreemiumLive
Market news, FinBERT sentiment, AI analyst debate, fundamentals and macro signals per stock ticker.
API key · JSON
100–1k/day
llms.txt
XOOMARFreemiumLive
SEC/FINRA/CFTC/Fed market data: filings, insider trades, short interest, earnings dates, macro rates.
API key · JSON
10k+/day
MCP server · llms.txt
ZelothornFreeLive
Plain-language business summaries, latest earnings beat/miss, and SEC filing links for US public companies.
None · JSON
10k+/day
no machine-readable spec
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