Skip to content
Marketstack logovsPolygon logo

Marketstack API vs Polygon API

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

The verdict

  • Choose Marketstack API if you want faster responses.
  • 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.

Side by side

Marketstack APIPolygon API
What it doesReal-Time, Intraday & Historical Market Data API.Stock API with real-time and historical tick data, unlimited usage via REST or WebSockets, standardized JSON and CSV formats.
Providermarketstack.comMassive
API keyRequiredRequired
HTTPSYesYes
CORS (browser calls)UnknownUnknown
Status todayOnline · 964 msOnline · 2100 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
Marketstack docs ↗Polygon docs ↗

About each API

Marketstack logoMarketstack API

Real-Time, Intraday & Historical Market Data API.

Access free stock data API offering real-time and historical market data for global exchanges. Marketstack provides fast, reliable stock price API solutions.

Strengths

  • HTTPS

Ratings, reviews and FAQ →

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 →

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.

Marketstack vs Polygon FAQ

Do Marketstack API and Polygon API need an API key?

Both require authentication (apiKey and apiKey).

More comparisons

Marketstack API alternatives · Polygon API alternatives · best Finance APIs