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
Planned outage 5/25/18-5/26/18
May 24, 2018
We will be moving datacenters this weekend ( after market hours ) to the Equinix datacenter in NJ. There are many benefits to the move, however it will require downtime during the transition.
The transition will start after market close on May 25th @ 20:00ET. The transition is expected to be completed by EOD May 26th. If for any reason this will not be the case, we will send out email updates with the status and updated ETA.
Thanks - Massive Team
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Quinton Pike
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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.
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