Changelog

We've resolved an issue where certain stocks business products weren't receiving official close prices at the correct time. Previously, aggregates that should have included the official close price 15 minutes after market close were delayed until midnight. All products now correctly receive official close prices at the appropriate time based on their plan permissions.

We've significantly expanded the plan information shown in our documentation to help you make more informed decisions. Each plan now displays comprehensive details including data access permissions, data recency, historical coverage, and update frequencies for every dataset. This enhanced transparency makes it easier to understand exactly what's included with each plan.

We've fixed an issue in the Conditions API where condition 17 for stock trades was incorrectly reported. The API now correctly indicates that condition 17 is eligible to update open and close prices in aggregates.

We've fixed an issue in our Snapshot v3 endpoint that, in certain cases, prevented underlying_asset.price and break_even_price from being returned for options contracts.

These fields are now consistently populated for options tickers. underlying_asset.price will reflect your plan's data for the underlying stock or index.

We've added a new REST endpoint for inflation expectations, showing how markets and models anticipate inflation across different time horizons. It complements our recently released inflation endpoint, which provides historical actuals.

Use it to track inflation sentiment, compare near-term and long-term outlooks, and support macroeconomic or fixed-income analysis.

Reference the Inflation Expectations API Docs for more details.

After years of quietly shipping behind the scenes, we've just made it easier for you to see what we're working on.

Going forward, you can expect updates on what's new, what's fixed, and what's being replaced with something better.

Check back as often as you'd like, but if you ever wonder “Was this always here?”, the answer now lives here.

We'll be sunsetting the Level 2 Crypto WebSocket on August 11, 2025. We're making this change so that we can keep focus on the performance and reliability of core features of our platform.

The Level 2 Crypto WebSocket was deprecated in June 2024, and we have reached out by email regarding the sunset to anyone with recent usage. After August 11, 2025, the Level 2 Crypto WebSocket will no longer be available.

We've released a major version update to our Javascript/Typescript client library, as well as a beta branch for our JVM Client.

Both of these releases leverage code-gen to automatically update the client from our OpenAPI spec whenever our API changes. The goal of these updates is to improve the developer experience by ensuring that the library is always in sync with the API.

You can find the latest versions of our client libraries, as well as examples to get up and running on our GitHub.

The Futures Beta is now live for early testers. We're rolling out access in batches to users who requested it over the last few months. Those accepted into the beta will have access to a new tab in the dashboard to leave feedback and report issues.

Including real-time futures data from CME, CBOT, NYMEX, and COMEX on our platform is part of our mission to modernize the infrastructure that powers financial markets.

If you didn't request access but are interested in trying it out, go to the futures page to be added to the waitlist.

Our Limit Up - Limit Down (LULD) WebSocket feed is now available for individuals on the Stocks Advanced plan, as well as business users with the Stocks Full Market Expansion. This feed provides real-time updates on LULD status changes for US stocks, allowing users to monitor trading halts and price bands.

Reference the LULD WebSocket Docs for more details.

We've expanded our economic data offerings with a new REST endpoint that provides monthly inflation observations from the US Government going back to 1947. This API allows users to access key inflation metrics like the Consumer Price Index (CPI) and Personal Consumption Expenditures (PCE) index. This API is generally available and included in all plans.

Reference the Inflation API Docs for more details.

We've resolved several issues with our Ticker Overview and All Tickers endpoints with the migration to a new and better architecture.

• Duplicate results which were being returned from the All Tickers endpoint have been removed, and each ticker should now return a single, unique result
• Logos are now consistently returned from the Ticker Overview endpoint
• We've corrected some historical tickers which used inconsistent symbology such as BRK/A rather than our standard BRK.A symbology
• Indices and FX tickers now support filtering by the active attribute
• We've made coverage for FX tickers more reliable

In 2022, we introduced a set of products aimed at making market data simpler and more accessible for businesses. As demand grew and the concept matured, we expanded on these ideas and developed them into our foundational business plans. These plans preserve the same ease of access while offering greater flexibility for more advanced use cases.

In early 2024, we began migrating users from Launchpad to these new business plans. Today, we're officially retiring Launchpad.

To the businesses who joined us early on this journey: thank you for taking the leap into new territory with us, and we look forward to continuning to evolve in new directions together.

We've partnered with TMX to include their comprehensive global corporate events calendar data (formerly Wall Street Horizon) via our REST API. This dataset includes 20+ types of historical and upcoming events which can impact stock prices, including:

• Earnings Announcements
• Corporate Action Dates
• Business Updates
• Analyst Days

Access is available via an expansion plan, with options available for both businesses and individuals.

Reference the TMX Corporate Events Docs for more details.

We've launched a new business-focused section of the site with clearer content on our plans and pricing. Nearly two years ago, we introduced Stocks for Business and Options for Business, plans designed to give companies immediate access to market data without needing exchange approval. They combine the most comprehensive sources available outside the scope of exchange licensing. For teams that do need exchange-licensed data, we offer expansions that layer those datasets onto the core plans. The new section helps clarify how these options work and what they cost. You can explore them under the "Business" menu in the main navigation.

Our Short Interest and Short Volume data for US Stocks is now generally available, and so is our Treasury Yield endpoint. These APIs are now marked as stable and can be used in production environments.

Reference the Short Interest Docs, Short Volume Docs, and Treasury Yield Docs for more details.

We've partnered with Benzinga to expand our data coverage with a new suite of structured financial datasets. The following datasets are now accessible via Polygon.io's REST APIs:

• Analyst Ratings
• Analyst Insights
• Corporate Guidance
• Earnings
• Financial News

Each dataset is offered as a separate expansion plan, with options available for both businesses and individuals.

Read the Benzinga partnership announcement

We've open-sourced the MCP Polygon Server, a lightweight Python server that makes Polygon.io market data available using the Model Context Protocol (MCP), a standard interface for structured data delivery to AI agents and tools. This project makes it easy to serve market data to any MCP-compatible system.

GitHub: polygon-io/mcp_polygon

We've launched a new experimental endpoint for Treasury Yield data from the US Government. This endpoint provides access to daily yield rates for various maturities dating back to 1962, allowing users to analyze trends and their impact on financial markets.

Reference the Treasury Yield Docs for more details.

We've launched new experimental endpoints for Short Interest and Short Volume data for US Stocks. These endpoints provide access to key metrics for understanding short selling activity in the market.

Reference the Short Interest Docs and Short Volume Docs for more details.