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Polygon API vs Yahoo Finance API

Two free Finance APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

  • Choose Polygon API for its data: Stock API with real-time and historical tick data, unlimited usage via REST or WebSockets, standardized JSON and CSV formats.
  • Choose Yahoo Finance API if you want to call it from browser JavaScript.

Side by side

Polygon APIYahoo Finance API
What it doesStock API with real-time and historical tick data, unlimited usage via REST or WebSockets, standardized JSON and CSV formats.Real time low latency Yahoo Finance API for stock market, crypto currencies, and currency exchange.
ProviderMassiveyahoofinanceapi.com
API keyRequiredRequired
HTTPSYesYes
CORS (browser calls)UnknownYes
Status todayOnline · 2100 msLast check failed
Uptime (30 days)UpDown
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
Polygon docs ↗Yahoo Finance docs ↗

About each API

Polygon logoPolygon API

Stock API with real-time and historical tick data, unlimited usage via REST or WebSockets, standardized JSON and CSV formats.

Stock API with real-time and historical tick data, unlimited usage via REST or WebSockets, standardized JSON and CSV formats. Instant access free tier.

Strengths

  • HTTPS

Ratings, reviews and FAQ →

Yahoo Finance logoYahoo Finance API

Real time low latency Yahoo Finance API for stock market, crypto currencies, and currency exchange.

Strengths

  • Callable from the browser (CORS)
  • HTTPS

Ratings, reviews and FAQ →

How to choose between them

  • Prototyping or a tutorial? Pick the one that needs no API key (neither does, so compare their free tiers).
  • Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
  • Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
  • Still unsure? Both are free to try: send one request to each and compare the data you get back.

Polygon vs Yahoo Finance FAQ

Do Polygon API and Yahoo Finance API need an API key?

Both require authentication (apiKey and apiKey).

Which can I call from the browser?

Yahoo Finance API supports CORS, so front-end JavaScript can call it directly. Call the other from a server.

More comparisons

Polygon API alternatives · Yahoo Finance API alternatives · best Finance APIs