What is the best free stock market data API in 2026?

There is no single best; free tiers optimize for different data. Alpaca's free IEX tier is the standout for a real-time-ish US equities feed. The SEC EDGAR API is free and keyless for fundamentals and filings (10 requests/second). Twelve Data and EODHD free tiers cover multi-asset evaluation, while Polygon Basic and Alpha Vantage are tightly capped sandboxes.

Is there a free API with real-time stock prices?

Yes, via Alpaca's free IEX feed, a genuine real-time subset of the consolidated SIP tape through its developer API. It is the most capable free real-time option since most rivals are delayed or tightly capped. The full SIP tape is a paid upgrade, and Polygon's real-time SIP only starts at its $199 Advanced tier.

What is the best free API for fundamentals and SEC filings?

The SEC's own EDGAR API: free, keyless (just a descriptive User-Agent header), and 10 requests/second per IP with no daily limit. It serves filings, submission history, and structured XBRL company-facts straight from the source. The catch is you parse it yourself; paid layers like sec-api.io add that parsing if you would rather not.

Best Free Stock Market Data API 2026

The short answer

The best free stock market data API in 2026 depends on the data you need. Alpaca's free IEX tier is the standout for a real-time-ish US equities feed. The SEC EDGAR API is the best free source for fundamentals and filings (keyless, 10 requests/sec). Twelve Data and EODHD free tiers cover multi-asset and global evaluation, while Polygon (Massive) Basic and Alpha Vantage are tightly capped sandboxes.

The best free stock market data API in 2026 depends on what you need free. For a real-time-ish US equities feed, Alpaca's free IEX tier is the standout: a genuine real-time IEX feed with a developer-friendly API. For fundamentals and filings, the SEC EDGAR API is free, keyless, and allows 10 requests/second. For broad coverage to evaluate, Twelve Data (8 calls/minute, 800/day) and EODHD (a limited free tier) cover stocks plus other assets. Polygon (now Massive) Basic and Alpha Vantage free tiers exist but are tightly capped (5 calls/minute and 25 requests/day respectively). No single API is best free; match the free tier to the data you actually need. Model the upgrade cost in the Data-Vendor TCO Calculator.

TL;DR

Need	Best free option	Free-tier limit
Real-time-ish US equities	Alpaca (IEX feed)	real-time IEX, developer API
Fundamentals and filings	SEC EDGAR API	10 requests/sec, no key
Multi-asset evaluation	Twelve Data	8 calls/min, 800/day
Global EOD breadth	EODHD	limited free tier
Delayed US equities sandbox	Polygon (Massive) Basic	5 calls/min, 15-min delayed
Indicators + price (low volume)	Alpha Vantage	25 requests/day, 5/min

Free-tier limits verified against each provider on 2026-05-26. Free tiers change; confirm current limits before relying on them.

There is no single "best free" API

The honest framing is that "best free stock market data API" has no single answer, because the free tiers optimize for different data. The right pick depends on whether you need real-time US prices, fundamentals and filings, broad multi-asset coverage to prototype, or just a sandbox to learn. Pick by the data your strategy actually consumes, not by a leaderboard.

The other reality: most free tiers are evaluation tools, not production feeds. A 5-calls-per-minute or 25-requests-per-day cap is fine for learning or a tiny nightly batch and unworkable for polling a live universe. Treat the free tier as a way to validate the vendor before you pay.

Best free for real-time US equities: Alpaca

Alpaca's free IEX tier is the standout for a real-time-ish US equities feed. It provides a genuine real-time IEX data feed (a subset of the full SIP tape) through the same clean, developer-first API that powers Alpaca's trading product, with paper trading and simple key auth. For a builder learning live-data handling or running a strategy that does not need the full consolidated tape, the free IEX feed goes further than most rivals' free tiers, which are delayed or tightly call-capped. Upgrading to the full SIP feed is a paid step, but the free tier is unusually capable.

Best free for fundamentals and filings: SEC EDGAR

For fundamentals and filings, nothing beats the SEC's own EDGAR API on price or generosity. It is free, requires no API key (only a descriptive User-Agent header), and allows up to 10 requests per second per IP with no daily limit. It exposes company filings, submission history, and structured company-facts data (XBRL financial concepts) straight from the source. The cost is that you parse it yourself: searching filing text and extracting sections is your code to write. For fundamentals-driven research on a budget, EDGAR is hard to beat.

The capped free tiers: useful but limited

Several well-known APIs offer free tiers that are best treated as sandboxes:

Twelve Data: 8 calls/minute and 800/day, spanning stocks, forex, and crypto. Good for multi-asset prototyping before a paid plan.
EODHD: a limited free tier on top of cheap paid global-coverage plans. Useful to evaluate global EOD breadth.
Polygon (now Massive) Basic: free but a sandbox, 5 calls/minute, 15-minute-delayed, roughly two years of history, no streaming.
Alpha Vantage: hard-capped at 25 requests/day (5/minute), with rate-tiered premium plans from $49.99/month. Fine for tiny, low-frequency use.

These are genuinely useful for learning and evaluation. They are not production feeds, and you will hit their caps quickly under any real polling load.

The decision

Real-time-ish US equities for free: Alpaca's IEX feed. The most capable free price feed here.
Fundamentals and filings for free: SEC EDGAR API. Free, keyless, 10 requests/sec.
Multi-asset prototyping: Twelve Data free tier. Stocks, forex, and crypto under one API.
Global EOD evaluation: EODHD free tier, then its cheap paid plans.
Just learning or a tiny batch: any of the capped tiers (Polygon Basic, Alpha Vantage) works.

Match the free tier to your data need: Alpaca for real-time US prices, EDGAR for fundamentals, Twelve Data or EODHD for breadth, and the capped tiers for learning. Then model the upgrade cost before you outgrow free.

Model the upgrade cost before you outgrow free

Free tiers are evaluation, not destination. Once a strategy works, you will hit a cap and need a paid plan, so model that upgrade early. Compare the paid tiers of your chosen vendors in the Data-Vendor TCO Calculator, and if your workflow centers on filings, model the LLM parsing cost in the Token-Cost Optimizer.

Cheapest Stock Market Data API 2026: the cheapest paid tiers once you outgrow free.
Alpaca IEX vs SIP Free Tier 2026: what Alpaca's free IEX feed does and does not cover.
sec-api.io vs SEC EDGAR Free API 2026: the free filings source versus a paid parsing layer.

Connects to

Data-Vendor TCO Calculator: paid-tier cost once you outgrow free.
Token-Cost Optimizer: LLM cost of parsing free filings data.

Sources

Alpaca, market-data docs (free IEX tier), alpaca.markets (accessed 2026-05-26).
SEC, EDGAR APIs and fair-access policy, sec.gov (accessed 2026-05-26).
Twelve Data, "Pricing," and Alpha Vantage premium pricing (accessed 2026-05-26).

Frequently asked questions

What is the best free stock market data API in 2026?: There is no single best; free tiers optimize for different data. Alpaca's free IEX tier is the standout for a real-time-ish US equities feed. The SEC EDGAR API is free and keyless for fundamentals and filings (10 requests/second). Twelve Data and EODHD free tiers cover multi-asset evaluation, while Polygon Basic and Alpha Vantage are tightly capped sandboxes.
Is there a free API with real-time stock prices?: Yes, via Alpaca's free IEX feed, a genuine real-time subset of the consolidated SIP tape through its developer API. It is the most capable free real-time option since most rivals are delayed or tightly capped. The full SIP tape is a paid upgrade, and Polygon's real-time SIP only starts at its $199 Advanced tier.
What is the best free API for fundamentals and SEC filings?: The SEC's own EDGAR API: free, keyless (just a descriptive User-Agent header), and 10 requests/second per IP with no daily limit. It serves filings, submission history, and structured XBRL company-facts straight from the source. The catch is you parse it yourself; paid layers like sec-api.io add that parsing if you would rather not.