Massive (formerly Polygon.io)
Massive (formerly Polygon.io): Broad market data with REST, streaming, and bulk downloads for developer-built finance products. Ranked #1 of 18 in Apis Data Services by our editors (8.8/10); pricing: Free plan; best for developers needing broad financial market data.
At a glance
- Editor score8.8 / 10
- PricingFree plan
- Best forDevelopers needing broad financial market data
- Free planYes
- Paid from$29/mo
- Historical dataYes
- Founded2017
- Facts checked24 Sep 2026
Where it wins
- Covers stocks, options, futures, indices, forex, crypto, and economics
- Offers REST, WebSocket streaming, and historical flat-file downloads
- Stocks Basic is free; paid Stocks plans start at $29 per month
Where it doesn't
- Stocks Basic is limited to 5 API calls per minute
- Stocks Starter and Developer provide 15-minute delayed data
- Plan prices shown apply to individual Stocks plans, not business plans
Our verdict on Massive (formerly Polygon.io)
Massive (formerly Polygon.io) provides financial market data for developers building trading applications, analytics tools, and other financial products. Its coverage spans stocks, options, futures, indices, forex, crypto, and economics, with additional alternative data described by the vendor. Developers can request data through REST endpoints, stream market updates over WebSockets, or download historical flat files for bulk analysis. This breadth suits teams that want several market-data types through one API-oriented service; it is less suited to buyers seeking a single-purpose finance dataset.
The access options matter for different workloads. REST endpoints support on-demand queries, while WebSockets are intended for live market updates. Historical data is available through API endpoints and flat-file downloads, giving applications and research workflows distinct ways to retrieve it. Official client libraries are available for Python, Go, Kotlin/JVM, and JavaScript. The listed integrations include Claude Code, Claude Desktop, Cursor, ChatGPT, Codex, GitHub Copilot, and Gemini CLI. This developer-centered mix is a fit for teams building in supported languages and workflows, though buyers should check that their preferred language and data needs align before choosing.
According to the vendor's pricing page, Stocks Basic costs $0 per month and includes 5 API calls per minute, 2 years of historical data, end-of-day data, and reference data. Stocks Starter is $29 monthly, with unlimited API calls, 5 years of history, and 15-minute delayed data; Stocks Developer is $79 monthly and extends history to 10 years. Stocks Advanced costs $199 monthly, with 20+ years of history and real-time data. These are individual Stocks plans, while business pricing differs. Massive is a strong fit when broad coverage and multiple delivery methods are priorities; teams needing real-time stock data should look at Advanced rather than the delayed-data tiers.
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Massive (formerly Polygon.io) pricing
All 4 Massive (formerly Polygon.io) plans and prices →
Massive (formerly Polygon.io) fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $29/mo |
| Monthly request limit | Not verified |
| Rate limit | Not verified |
| API style | Rest |
| Historical data | Yes |
| Webhooks | Not verified |
| Official SDKs | Yes |
| Data coverage | Global |
| Deployment | Cloud |
| Support | Email, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 7 integrations: Claude Code, Claude Desktop, Cursor, ChatGPT, Codex, GitHub Copilot … |
| Pricing | Free plan (source) |
| Website | massive.com |
| Facts checked | 24 Sep 2026 |
Massive (formerly Polygon.io) integrations
Massive (formerly Polygon.io) lists 7 integrations on its own site.
- Claude Code
- Claude Desktop
- Cursor
- ChatGPT
- Codex
- GitHub Copilot
- Gemini CLI
Alternatives to Massive (formerly Polygon.io)
- EODHDA broad REST data API for teams combining market prices, fundamentals, news, and screening.8.7
- Alpha VantageA REST API for global market data, with historical equities and technical indicators.8.5
- FinnhubFinancial-data APIs spanning real-time prices, fundamentals, news, and historical market data.8.4
See all Massive (formerly Polygon.io) alternatives →
Massive (formerly Polygon.io) vs the competition
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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