Stock Price APIs
Most stock price APIs are freemium, keyed feeds with real-time and historical quotes. Twelve Data and Massive (formerly Polygon.io) cover stocks alongside forex and crypto, Marketstack adds intraday prices and EDGAR filing data, and Tradier pairs US quotes with brokerage trading. Outside the US, aikstockdata serves Korean closing prices as free static JSON with no key. Free Stock APIs →
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
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 |
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 |
FinageReal-time and historical stock, forex, and crypto market data with a REST and WebSocket API. Finance & Commerce › Stock Market | Free trial | API key | JSON | — | 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 |
Financial Modeling PrepStock quotes, financial statements and market data API for equities and other assets. Finance & Commerce › Stock Market | API key | JSON | — | Untested | |
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 |
IntrinioUS stock, options, and fundamentals data feeds, including real-time prices and historical financials. Finance & Commerce › Stock Market | Free trial | API key | JSON | — | 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 |
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 |
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 |
TradeWatchReal-time and historical quotes, OHLC and fundamentals for forex, crypto, commodities, indices and stocks. Finance & Commerce › Stock Market | Paid | API key | JSON | — | 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 |
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
EOD Historical DataFreemiumLive
End-of-day and historical prices for stocks, ETFs and forex across 60 exchanges.
API key · JSON
<100/day
llms.txt
FinageFree trialLive
Real-time and historical stock, forex, and crypto market data with a REST and WebSocket API.
API key · JSON
—
no machine-readable spec
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
Financial Modeling PrepUntested
Stock quotes, financial statements and market data API for equities and other assets.
API key · JSON
—
no machine-readable spec
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
IntrinioFree trialLive
US stock, options, and fundamentals data feeds, including real-time prices and historical financials.
API key · JSON
—
no machine-readable spec
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
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
TickerLayerFreemiumLive
Unified quotes, trades and snapshots for stocks, forex, crypto, indices, ETFs and commodities.
API key · JSON
100–1k/day
llms.txt
TradeWatchPaidLive
Real-time and historical quotes, OHLC and fundamentals for forex, crypto, commodities, indices and stocks.
API key · JSON
—
OpenAPI spec · llms.txt
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
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Choosing a Stock Price API
Is there a free Stock Price API?
Yes. aikstockdata is free to use, and Twelve Data, Marketstack, Finnhub, Aletheia, Alpha Vantage and 8 others have a free tier alongside paid plans. See all free Stock APIs.
Which Stock Price APIs work without an API key?
aikstockdata needs no key or sign-up, so you can try it with a plain request.
Can I call a Stock Price API from front-end JavaScript?
aikstockdata allows cross-origin requests and needs no key, so it works straight from the browser. For the others, call them from your server so your key stays private.
Can I use Stock Price APIs in a commercial project?
Aletheia permits commercial use. Twelve Data, aikstockdata, Alpha Vantage, EOD Historical Data, Finage and 4 others restrict it, for example to non-commercial or attributed use, so read the terms first.
Which Stock Price APIs work with AI agents?
aikstockdata has both an MCP server and an OpenAPI spec. Twelve Data and SiftingIO have an MCP server, so an AI agent can call them directly. Massive (formerly Polygon.io) and TradeWatch publish an OpenAPI spec for generating clients and tools.
Broader: Stock Market APIs · Finance & Commerce APIs
More in Stock Market: Historical Stock Data APIs · Options Data APIs · ETF APIs · Fundamentals APIs · SEC Filings APIs · Earnings APIs · Insider Trading APIs