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Polygon API vs Twelve Data 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 Twelve Data API if you want faster responses.

Side by side

Polygon APITwelve Data API
What it doesStock API with real-time and historical tick data, unlimited usage via REST or WebSockets, standardized JSON and CSV formats.Stock market data (real-time & historical).
ProviderMassiveTwelve Data
API keyRequiredRequired
HTTPSYesYes
CORS (browser calls)UnknownUnknown
Status todayOnline · 2100 msOnline · 836 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
Polygon docs ↗Twelve Data 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 →

Twelve Data logoTwelve Data API

Stock market data (real-time & historical).

Try Twelve Data financial APIs for free with instant access to stock, forex, cryptocurrency, and fundamental market data. Real time, historical, and EOD data.

Strengths

  • 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 Twelve Data FAQ

Do Polygon API and Twelve Data API need an API key?

Both require authentication (apiKey and apiKey).

More comparisons

Polygon API alternatives · Twelve Data API alternatives · best Finance APIs