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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Posts from Justin
More posts from Justin
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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Analyzing Market Sentiment with the Short Volume and Short Interest APIs
Learn how to use Massive's Short Volume and Short Interest APIs to analyze market sentiment, spot short-selling trends, and identify potential short squeezes with real examples from NVDA and GME.
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Benzinga Data Now Available on Massive.com
Massive.com 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 Massive’s REST APIs.
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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.
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Hunting Anomalies in the Stock Market
This tutorial demonstrates how to detect short-lived statistical anomalies in historical US stock market data by building tools to identify unusual trading patterns and visualize them through a user-friendly web interface.
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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 Massive.com.
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Sentiment Analysis with Ticker News API Insights
Explore how Massive.com's enhanced Ticker News API leverages advanced sentiment analysis for strategic market insights, featuring practical applications with real-world data.
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Analyzing the Market Impact of the CrowdStrike Outage
Explore our detailed case study on the CrowdStrike outage of July 2024, revealing critical insights into the Stock and Options markets' reactions, and demonstrating the power of Massive.com's robust datasets.
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Finding Connections with the Related Companies API
In this tutorial, we'll explore the capabilities of Massive.com’s Related Companies API, where we learn how to identify and visualize intricate corporate relationships using Python and vis.js.
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Understanding Nvidia's Stock Split Using the Stocks Splits API
The Nvidia stock split just occurred. Splits are not uncommon, and you need to ensure your algotrading systems continue to provide accurate market insights. Here's how you handle stock splits with Massive.com
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Learn How to Download Historical Stock Market Data
Learn how to easily download stock market data with Massive.com. This tutorial covers both web-based and S3 client access, ideal for anyone looking to analyze historical stock market data effectively.
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Release Notes - April 2024
Massive.com 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.
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Deep Dive into Trade-Level Data with Flat Files
Explore stock market trades with Flat Files, an easy workflow for accessing and analyzing comprehensive trade-level data across all stocks on any given day.
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Historical File Downloads Included In All Plans – No Really
Massive now includes daily historical Flat Files in all paid plans at no extra charge, featuring a new web-based File Browser and S3 access for simplified data exploration and integration.
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Pattern for Non-Blocking WebSocket and REST Calls in Python
This tutorial provides a step-by-step guide on implementing non-blocking WebSocket and REST API calls in Python, demonstrating efficient real-time data processing techniques essential for high-volume streaming applications.
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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.
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Mapping Market Movements with Massive.com and D3.js Treemap
Learn how to create an interactive Treemap visualization of stock market conditions using Massive.com's Snapshot API and D3.js.
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Building a Unix top-inspired Tool to Monitor the Stock Market in Real-Time
In this tutorial, we will learn how to build a real-time stock market monitoring tool using Python and Massive.com's API, inspired by Unix's top command, to process and visualize streaming trade data across the US stock market.
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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.
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Massive.com + Kotlin: Unlocking Real-Time and Historical Stock Market Data
A comprehensive guide for accessing market data using Massive.com's APIs and the JVM client SDK written in the Kotlin programming language.
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Release Notes - July 2023
We've been hard at work introducing new features such as our Universal Snapshot API, a Massive plugin for ChatGPT, and Indices data. We've also made a number of improvements to our services and have some exciting case studies and tutorials to share with you.
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Case Study: Algorithmic Trading With Go
In this case study, we are excited to share an insider's perspective and look under the hood of how a Massive.com customer built an automated retail trading bot that is capable of monitoring the entire stock market in real-time.
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Track Movements Across Markets with our New Universal Snapshot API
Discover the newly launched Universal Snapshots API, a powerful tool providing streamlined and consistent market data across Stocks, Options, Indices, Forex, and Crypto assets, all in one API call - enhancing your market analysis and decision-making process.
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Announcing the Massive ChatGPT Plugin
Introducing the Massive plugin for ChatGPT, a powerful tool that simplifies financial research by providing easy access to real-time and historical market data for Stocks, Options, Indices, Forex, and Crypto.
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Finding Correlation Between Stocks
Explore how to identify stock correlations and enhance portfolio diversification by building correlation matrices with Python and Massive's python-client library in this comprehensive tutorial.
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Indices Data Has Arrived
We are excited to announce the launch of the Indices API endpoints, offering real-time and historical market data for over 11,400+ Indices, including the S&P 500, Dow Jones Industrial Average, Nasdaq-100, and the VIX. With access to comprehensive market data, businesses and individual investors can make informed decisions in today's rapidly evolving financial markets. We have brought the same low-latency and developer-centric API design of our
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Massive.com + JavaScript: Unlocking Real-Time and Historical Stock Market Data
A comprehensive guide for accessing market data using Massive.com's APIs and the JavaScript programming language.
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Speed Up Downloads: Gzip Compression for Massive's API
Discover the benefits of using gzip compression for faster downloads and how to get started with Python, Go, and cURL.
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Simplifying Data Access with CSV Support
We are excited to announce the launch of CSV support for our REST APIs. You can now choose between JSON and CSV formats when making requests to our platform for Stocks, Options, Forex, and Crypto market data. With the addition of CSV support, you no longer need to transform or convert the data manually, which makes working with financial data more accessible. In this blog, we will walk you through the new feature, provide examples, as well as links to our docs for reference. Getting Started By
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Deep Dive: Stock and Options Trade Activity In Wake Of Regional Bank Failures
We will analyze the trade activity around US regional banks that have been experiencing financial difficulties, using a data-driven approach with Massive's stock and options market data
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Massive.com + Go: Unlocking Real-Time and Historical Stock Market Data
A comprehensive guide for accessing stock market data using Massive.com's APIs and the Go programming language.
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Massive.com + Python: Unlocking Real-Time and Historical Stock Market Data
Learn how to use Python to integrate real-time stock market data from Massive.com's APIs in this step-by-step guide. Perfect for developers, traders, and entrepreneurs, this post covers accessing high-quality financial data and enhancing your market analysis and trading strategies using Python.
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