release notes - Polygon.io

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.

announcement

Announcing Polygon.io Financials: Balance Sheets, Cash Flow, Income Statements — and Ratios

There are four new fundamentals endpoints, one daily-refreshed ratios feed, and a developer experience designed for screens, research, and automated reporting.

announcement

Benzinga Data Now Available on Polygon.io

Polygon.io is excited to announce a new partnership with Benzinga, significantly enhancing our financial data offerings. Benzinga’s detailed analyst ratings, corporate guidance, earnings reports, and structured financial news are now available through Polygon’s REST APIs.

release notes

Release Notes - June 2025

New APIs for short interest, short volume, and treasury yields. Benzinga data now available via expansion packs. Flat Files docs improved for easier access.

release notes

Release Notes - September 2024

Explore the latest enhancements and tutorials in our September 2024 release notes, featuring new data center operations, advanced API functionalities, and comprehensive educational content designed to elevate your experience with Polygon.io.

release notes

Release Notes - April 2024

Polygon.io enhances platform capabilities with the launch of Flat Files now included with paid plans at no extra charge, significant progress on the Chicago data center, new integrations with everviz and QuantConnect, and valuable tutorials for using Flat Files and managing data streams efficiently.

release notes

Release Notes - December 2023

We introduce enhanced WebSocket API features, expanded crypto offerings, improved data latency, Slack integration for system monitoring, along with insightful case studies and practical tutorials.

announcement

Release Notes - September 2023

We've introduced historical second aggregates based on user feedback, and enhanced our system monitoring to ensure you're always updated in real time.