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Polygon.io

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Developer first market data APIs, now operating under the Massive brand

Financial Data APIs
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  • Deployment Cloud Based, SaaS
  • Starting price $199
  • Free trial Available
  • Best for Freelancers, Small Business, Medium Business

What is Polygon.io?

Polygon.io provides market data APIs for stocks, options, indices, forex and crypto, delivered as standardised JSON and CSV with client libraries, tutorials and a remote MCP server. The company now operates as Massive, and its pricing and code samples appear under that name, though the polygon.io domain and API remain in use.

Being built by developers for developers is claimed by most data vendors and demonstrated by few. Here it shows in specifics: both JSON and CSV rather than a proprietary format, client libraries in Python, JavaScript, Go and Java, and worked tutorials, all of which reduce the time between signing up and getting a first useful response.

Pricing per dataset rather than as one bundle is the commercially notable part. A developer wanting only company financials pays 29 dollars a month rather than subscribing to a full market feed, which makes small projects viable in a category that usually starts in the thousands.

The individual use restriction on the cheaper tiers is the constraint to read carefully, since a side project that becomes a product needs a different plan. The rebrand is worth noting for the same practical reason: community answers, tutorials and Stack Overflow posts are almost all written under the Polygon.io name, while the current documentation and billing say Massive, so a developer searching for help will move between two names for one product.

Key Features of Polygon.io

  • Stock, options, index, forex and crypto market data
  • Real time and 20 plus years of historical data
  • Standardised JSON and CSV output
  • Client libraries for Python, JavaScript, Go and Java
  • WebSocket streaming
  • Remote MCP server
  • Per dataset subscriptions
  • Tutorials and worked examples
  • Financials and ratios as a standalone dataset
  • News and analyst ratings dataset

Polygon.io Pricing

Stocks

$199

Request pricing

Real time stock data, 20 plus years of history and websockets in one package. Individual use only.

Additional dataset

$99

Request pricing

Per dataset, including financial news and analyst ratings integrated into the API.

Financials and Ratios

$29

Request pricing

Company financials and key ratios without a stocks subscription. Individual use only.

Polygon.io Specifications

Deployment
  • Cloud Based
  • SaaS
Desktop
  • Web App
Built for
  • Freelancers
  • Small Business
  • Medium Business
  • Large Enterprise
Support
  • Email
  • Knowledge Base
Public API
Yes
Free trial
Yes
Free plan
No
Runs in browser
No
Customisable
No
Website
polygon.io

Polygon.io Screenshots

Polygon.io screenshot 1

Polygon.io Comparisons

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Polygon.io FAQs

Published on the Massive pricing page: 199 dollars a month for stocks including real time data, 20 plus years of history and websockets, 99 dollars a month per additional dataset, and 29 dollars a month for financials and ratios alone. The cheaper tiers are individual use only.

The company now presents itself as Massive, with pricing and code samples under that name, while the polygon.io domain and API continue to operate.

Both JSON and CSV rather than a proprietary format, client libraries in four languages, and worked tutorials, all of which shorten the time from signing up to a first useful response.

A developer wanting only company financials pays 29 dollars a month rather than subscribing to a full market feed, which makes small projects viable in a category that usually starts in the thousands.

The individual use restriction on the cheaper tiers. A side project that becomes a product needs a different plan.