MarketParquet vs Massive (formerly Polygon.io)
> real-time + historical market data via REST and WebSocket APIs
First, the name: on October 30, 2025, Polygon.io rebranded to Massive (massive.com). Same company, same product, same API -- existing keys and api.polygon.io endpoints keep working during an extended transition, with polygon.io redirecting to massive.com. Massive is a strong general-purpose market data API with real-time feeds and broad asset-class coverage. MarketParquet is narrower -- US stocks, ETFs, and futures only -- but ships data as Parquet files purpose-built for backtesting workflows. Here's how they actually compare for the historical-research use case.
[ Side-by-side ]
| Massive (formerly Polygon.io) | MarketParquet | |
|---|---|---|
| Asset classes | stocks, options, forex, crypto, indices | US stocks, ETFs, futures |
| History depth (stocks) | back to 2003 on the Stocks Starter tier | back to 2000 (one-time archive; free sample is recent daily) |
| History depth (futures) | limited to certain tiers | back to Dec 2007 (Complete Archive) |
| Format | JSON via REST, flat files on paid tiers | Apache Parquet, snappy-compressed, by-date partitioned |
| Real-time data | yes (Advanced tiers) | no -- end-of-day batch only |
| Free tier | limited to 5 calls/min, no flat files | recent daily sample, unlimited downloads, no card |
| Pricing (entry, historical only) | around $29/mo for Stocks Starter | one-time: Complete Archive $79 |
| Split-adjusted prices | yes | yes |
| Includes delisted tickers | yes | yes |
[ Where Massive (formerly Polygon.io) wins ]
- Real-time WebSocket feeds for live trading -- MarketParquet doesn't do real-time.
- Options chains, quotes, and Greeks -- not in our data.
- Tick-level data on higher tiers.
- Broader asset coverage (forex, crypto, indices).
[ Where MarketParquet wins ]
- Parquet beats paginated JSON for bulk historical loads -- ~10x smaller, ~100x faster to load with pandas/polars/duckdb.
- Buy the archive once -- no subscription; 25 years of history you keep forever.
- One presigned download fetches a whole trading day, not 6.5 hours of paginated /aggs calls.
- Lower entry price if you only need historical research.
[ Which to pick ]
Pick Massive (formerly Polygon.io) if you need real-time data, options chains, tick-level data, or non-equity asset classes.
Pick MarketParquet if you're doing historical backtesting on US equities, ETFs, or futures and you want bulk Parquet files instead of paginated JSON.
[ FAQ ]
What happened to Polygon.io?
Polygon.io rebranded to Massive on October 30, 2025. The website moved to massive.com (polygon.io now redirects there), billing shows 'Massive.com, Inc.', and email moved to @massive.com. It is a rename, not an acquisition or shutdown -- the team, products, and pricing carried over unchanged.
Is Polygon.io shutting down?
No. The company continues to operate as Massive. The old api.polygon.io endpoints keep working alongside api.massive.com for an extended transition period; the company has said old endpoints will be phased out eventually, with advance notice.
Do my Polygon.io API keys still work?
Yes. Existing code, API keys, and logins remain valid with no changes required. SDK upgrades will gradually default to the api.massive.com domain.
Is Polygon.io / Massive related to the Polygon crypto network?
No. Polygon.io (now Massive) is a financial market data company. The Polygon blockchain (MATIC/POL) is an unrelated crypto project -- the shared name was a long-running source of confusion, and the rebrand to Massive ends it.
> Pricing and feature snapshots reflect public information at time of writing and may shift. Always confirm against Massive (formerly Polygon.io)'s own pricing page before committing.