• Zero setup. It's hosted at https://mcp.massive.com/, so there's no local server to run or maintain.
• Lower token usage. You get a small set of composable tools instead of dozens of individual endpoints, and the documentation is indexed automatically so it stays current.
• Access follows your plan. You can query any asset class included in your Massive subscription.

It works great with Claude Code, Claude Desktop, Cursor, and other clients that support MCP.

To get started, follow the Remote MCP Server quickstart.

• 8-K Disclosures - Material corporate events from 8-K filings, classified into a three-tier disclosure taxonomy. Ideal for event detection and alerts, event-driven strategies, M&A tracking, leadership-change monitoring, and corporate-action timelines.
• Disclosure Categories - The hierarchical taxonomy used to classify 8-K disclosure events, providing the controlled vocabulary of primary, secondary, and tertiary categories with descriptions and examples.

These complement our existing 8-K Text, Form 3, Form 4, 13-F, 10-K Sections, and SEC Filings Index endpoints.

It has been replaced by a broader, generally available set of Fundamentals APIs with expanded coverage and improved functionality:

• Balance Sheets
• Cash Flow Statements
• Income Statements

Depending on your plan, accessing the Fundamentals endpoints may require an upgrade or add-on. Individuals can use the Stocks Advanced plan or the Stocks Financials Add-on, and organizations can use the Stocks Business plan or the Stocks Financials for Business Add-on.

For entitlement questions or migration support, contact support@massive.com.

• REST Endpoints - Trades, quotes, aggregates, snapshots, contracts, products, schedules, exchanges, and market status
• WebSockets - Real-time streaming of aggregates, trades, and quotes
• Flat Files - Daily CSV downloads for large-scale historical data

This includes major futures contracts (ES, GC, CL, NG, and more) across CME, CBOT, COMEX, and NYMEX.

• Form 3 - Initial beneficial ownership filings by corporate insiders
• Form 4 - Changes in beneficial ownership by corporate insiders

These new endpoints add detailed insider ownership and transaction data, complementing our existing 13-F, 8-K Text, 10-K Sections, and EDGAR Index endpoints.

• 13-F Filings - Quarterly institutional investment holdings data

This endpoint provides detailed equity holdings reported by institutional investment managers with at least $100 million in assets under management, including share counts, market values, investment discretion, and voting authority.

Two new REST endpoints deliver European consumer spending data powered by daily credit card, debit card, and open banking transaction panels across the United Kingdom, Germany, France, Italy, Spain, and Austria:

• Merchant Aggregates - Daily aggregated consumer spending at merchants and payment processors, split by online, offline, and buy-now-pay-later (BNPL) channels. Data has a 30-day embargo for Individuals and 7 for Businesses. Includes Bloomberg ticker mapping for ~250 US public companies, spend metrics, and rolling account counts for normalization.
• Merchant Hierarchy - Reference data mapping ~3,500 merchants to parent companies, tickers, sectors, and industries. Use for point-in-time joins with merchant aggregates data to capture corporate changes over time.

Historical data back to 2016. Available on Individual ($99/mo) and Business (contact sales) plans.

Learn more on the Consumer Spending product page.

• 8-K Text - Parsed plain-text content from 8-K filings
• Filings Index - Master index of all SEC filings with metadata and direct links

These complement the existing 10-K Sections and Risk Factors endpoints, giving you complete access to the most important filing types in clean, easy-to-use formats.

REST APIs:

• Trades: New decimal_size field with exact executed quantity as a decimal string
• Unified Snapshot v3:
  • decimal_size on the last-trade field
  • decimal_volume on the last-minute and session fields
• Snapshots v2:
  • ds on the last-trade field
  • dv on the day field
  • dv and dav on the min agg field

WebSocket APIs:

• Trades: New ds field for exact trade quantity
• Aggs: New dv and dav fields

Flat Files:

• Trades: size field is now a decimal (exact trade quantity). Historical files remain unchanged.
• Aggs: volume field is now a decimal.

This endpoint is generally available and included in all plans.

Reference the Labor Market API Docs for more details.

Like other Benzinga datasets, Bulls Bears Say is offered as a separate expansion plan with options for both businesses and individuals.

• 10-K Sections — Plain-text content of specific sections from SEC filings

This endpoint provides clean, structured text extracted directly from filings. Currently supports Business and Risk Factors sections, with additional sections coming soon.

Reference the Float Docs for more details.

• Risk Factors — Individual risk factors extracted from SEC filings
• Risk Categories — Categorized groupings of risk factors

Use these endpoints to analyze disclosed risks across companies, track how risk disclosures change over time, or compare risk profiles within a sector.

Every endpoint page is also available as markdown by adding .md to the URL, or click the "Open as Markdown" button on any docs page. All exports include complete parameter documentation, response schemas, and sample responses.

Other improvements from the previous version include standardized point-in-time symbology that matches price data, clearer categorization (forward splits, reverse splits, stock dividends for splits; expanded distribution types for dividends), and removal of unsupported tickers for cleaner data.

The v2 API provides faster access to breaking financial news and market-moving stories as they happen. Reference the Benzinga News v2 documentation for details.

Read more

Behind the scenes, we began a journey to engineer the foundation of that next ecosystem, an effort that pushed us to think more boldly about the future we wanted to create. From that work emerged a larger vision: a platform built to bring the world's financial data together, enable frictionless analysis, and provide access through every modern interface.

Today, Polygon.io becomes Massive, a name worthy of the scale of the undertaking ahead and the natural continuation of our mission. Thanks for being part of our journey, and here's to a massive leap forward in financial market data.

Read the full announcement

Reference the Benzinga News API v2 Docs for more details.

• Profiles — Detailed fund profiles with exposure breakdowns
• Fund Flows — Daily inflows and outflows tracking
• Constituents — Complete ETF holdings data
• Taxonomies — Strategic classification and categorization systems
• Analysis — Proprietary risk, reward, and quantitative scoring metrics

Each dataset starts at $99/month for individual users, with business plans also available. These datasets complement the US ETF trade, quote, and aggregate data which remains available in our stocks plans.

• Income Statements
• Cash Flow Statements
• Balance Sheets

This enhancement provides better transparency into the timing of financial data availability, helping users distinguish between the reporting period and when the data became publicly accessible.

View the NYSE Net Order Imbalances WebSocket Docs for more details.

If you are currently using the experimental Financials API, we recommend transitioning to the new endpoints as soon as possible to ensure uninterrupted access to financial data.

• Income Statements
• Cash Flow Statements
• Balance Sheets
• Ratios

These APIs give you direct access to comprehensive company fundamentals dating back to 2009, covering roughly 6,700 public companies with quarterly, annual, and TTM data that updates daily. The Ratios API offers daily valuation, profitability, liquidity, and leverage metrics for around 4,400 active tickers, including P/E, EV/EBITDA, and Return on Equity. The new endpoints are available today for users on our Stocks Advanced and Stocks Business plans, or as add-ons starting at $29/month, and replace the experimental Financials API, which is now deprecated.

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

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.

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.

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.

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.

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.

Reference the LULD WebSocket Docs for more details.

Reference the Inflation API Docs for more details.

• 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 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.

• 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.

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

• 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

GitHub: massive-com/mcp_massive

Reference the Treasury Yield Docs for more details.

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