Massive

What it is

Massive is a market data API for people writing code: REST endpoints for aggregates, trades and quotes, a WebSocket for streaming, and flat-file downloads for anyone who would rather pull a year of ticks into a bucket than paginate through it. Coverage is US-only — equities, options, indices, futures, forex and crypto — priced per asset class, so an options subscription does not come with equities attached.

The company traded as Polygon.io until 30 October 2025, when it renamed itself Massive.com, Inc. Nothing about the product changed with the name: the same accounts, keys and endpoints carried over, and the old domain redirects to the new one.

The distinguishing fact is the source: Massive takes exchange feeds directly rather than reselling somebody else's aggregation. That is what makes full tick history available at all, and it is the reason the price per asset class is what it is.

Pricing

Stocks, options and futures each have four tiers; indices has three, at $0, $49 and $99, and currencies two, at $0 and $49. Basic is free, end-of-day and capped at five requests a minute. Starter, at $29/month, is where the rate cap, the WebSocket and flat files change hands — but the data is still 15-minute delayed, and so is Developer at $79, which buys tick-level trades and a longer history window rather than a faster feed. Real-time trades and quotes start at Advanced, $199/month, and Advanced is the one tier the checkout sells only to subscribers who qualify as non-professional. History is drawn per asset class too: stocks run 2, 5, 10 and 20+ years up the ladder, options 2, 2, 4 and 5+, futures 2, 2, 5 and 7+. Futures cover CME, CBOT, NYMEX and COMEX, are 10-minute rather than 15-minute delayed below Advanced, and carry top-of-book quotes from Developer up; no individual plan sells order-book depth.

Budget by asset class, not by tier name: stocks and options are separate subscriptions, so real-time on both is $398 a month, not $199. Currencies are the one place where real-time is cheap — that plan starts at $49.

The individual tiers are licensed for personal, non-business use. Commercial use is a different price list, checked on 3 October 2026: $2,499/month for stocks, $1,999 for options, $999 for each futures exchange. It is not the Advanced tier with a business licence. Stocks Business and Options Business stream fair-market-value prices and minute aggregates, with historical trades and quotes and no trade or quote WebSocket; the vendor sells real-time tick trades and quotes to a business as an add-on, with the exchange fees on top.

Data & coverage

US markets only. If you need European or Asian listings, this is the wrong provider and no tier fixes it — see the market data category for ones that cover them.

Beyond bars, the reference endpoints are where the plans differ least. FINRA's twice-monthly short interest is an endpoint on every Stocks plan, with records from 29 December 2017 on the paid plans and two years on free Basic (short interest as data). /v1/marketstatus/upcoming lists the next NYSE, Nasdaq and OTC holidays and early closes on every plan, forward-looking only. Dividends and splits are separate endpoints — two years on Basic, all of it from Starter. And adjusted=true on the bars adjusts for splits only, never for dividends (split and dividend history as data).

Quote sizes are in shares, not round lots, since 3 November 2025, the day the SEC's price-tiered round-lot definition took effect: by the vendor's notice of 27 October 2025, bid_size and ask_size in the stocks quotes REST API, WebSocket and flat files changed unit that day, so a 5 became a 500. Stored quotes from either side of the date are in different units (streaming real-time quotes).

Integrations

Client libraries for Python, JavaScript, Go and Java, published under the massive name since the rename with the older polygon packages maintained alongside them. Flat files are served over an S3-compatible interface at files.massive.com; the daily bars are us_stocks_sip/day_aggs_v1, from Starter up, posted by about 11:00 ET the next day, and every stock flat file is unadjusted for splits and dividends. The REST equivalent for a whole market day is the grouped daily endpoint, /v2/aggs/grouped/locale/us/market/stocks/{date}, which is on every Stocks plan including Basic, split-adjusted unless you pass adjusted=false, and leaves OTC out unless you pass include_otc=true; both reach back to 10 September 2003 on the plans that carry full history. There is a first-party MCP server, rebuilt in March 2026 around four composable tools — search the endpoint docs, read one, call the API, query with SQL — rather than one tool per endpoint, so an agent can work the API without a hand-written wrapper.

Limitations

• No non-US equity or options listings at any price.
• Real-time is the $199 tier. The $29 and $79 tiers are 15-minute delayed, which catches people who read "unlimited API calls" as "live data".
• Redistribution, display to third parties and any business use need a separate agreement, which catches people building consumer products.
• Company financials and ratios are a separate $29/month product unless you are on Stocks Advanced, which bundles them.
• Training a model on the data needs an Order Form that permits it. The business terms, last updated 6 October 2026, bar using the information to train, fine-tune or distill any machine-learning or AI model unless an Order Form expressly permits it (clause 6.1(j)). See Can you train a model on licensed market data?.

Alternatives

Within the same category: providers that cover non-US markets, and cheaper aggregators for anyone who does not need tick data.

Compare it against the rest of the market data APIs.