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
Networking Upgrades: 08/10/2019
Aug 8, 2019
We will be performing some networking upgrades this Saturday, August 10, 2019 from 00:00 to 12:00 ET. Please expect some downtime during these hours.
Thanks - Massive Team
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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