The Best Stock Market APIs in 2026

Full-stack financial data — 363+ endpoints covering fundamentals, quotes, ETFs, macro, crypto, insider trades, and congress trading for 42,000+ companies on 90+ exchanges. The 10,000 calls/month free tier is the largest in the category, fundamentals are included in every plan, and it is the only provider here with a native MCP server for AI agents. Yes, it is our own product — the numbers below are checkable.

The reference for US market data infrastructure: excellent tick-level and options data, WebSockets, and flat-file downloads. Fundamentals are comparatively thin and coverage is US-centric — pair it with a fundamentals provider for research use cases.

Broad fundamentals coverage at aggressive prices with a long endpoint list. Data quality on smaller international names can be inconsistent, and the free tier is capped at 250 calls/day with limited history.

The classic hobbyist entry point — simple API, decent docs, and a genuinely free tier. But 25 requests/day makes anything beyond toy projects impractical, and there is no streaming.

Solid end-of-day price coverage across global exchanges at fair prices. Fundamentals and other datasets are sold as add-on packages, which makes the real total cost higher than the headline price.

Good real-time US coverage and a generous per-minute free tier for quotes. Institutional-grade fundamentals and alternative data sit behind significantly more expensive tiers.

The institutional gold standard with unmatched breadth and support. Enterprise contracts start in the tens of thousands per year, procurement takes months, and nothing is self-serve. If you have to ask the price, this is not your tier.

Deep institutional datasets and long history, comparable to Bloomberg in scope. Same enterprise sales model: opaque pricing, long contracts, and integration overhead that only makes sense at scale.