Polygon.io is Now Massive
Polygon.io is now Massive.com. The rebrand reflects our focus on scale, reliability, and continued innovation. Your APIs, accounts, and integrations continue to work without interruption.
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Introducing
Production Infrastructure Upgrades: Sunday, September 20, 2020
Aug 31, 2020
We will be upgrading our production infrastructure Sunday, September 20, 2020 @ 2:00 PM EST.
While we do not expect there to be any downtime, you may experience degraded performance during this time. We expect the maintenance to be completed by 6:00 PM EST, and we’ll post an update when the upgrades are complete.
We appreciate your patience.
As always, please don't hesitate to let us know if you have any questions.
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Peter Stacho
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From the blog
See what's happening at Massive.com
Upcoming Changes to Bid and Ask Sizes in Stocks Quotes
Effective Nov 3, 2025, bid_size/ask_size will be reported in shares (not round lots) across Stocks Quotes REST API, WebSocket, and Flat Files, per SEC MDI rules. The rule is forward-looking and we’ll also backfill history for consistency. Most users need no changes.
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Querying Financial Markets with the Massive.com MCP server, Claude 4, and Pydantic AI
Learn how to use Massive's MCP server inside of a Pydantic AI agentic workflow, alongside Anthropic's Claude 4 and the Rich Python library.
alexnovotny