From the blog
See what's happening at Massive
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.
editor
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