# ThetaData vs Massive (Polygon) (2026) | TradingAgentStack

> ThetaData vs Massive (Polygon): assets, live vs paper, order approval and safety controls, pricing and rate limits, each with a source.

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# ThetaData vs Massive (Polygon)

By [Ahsen (@satovinci)](https://tradingagentstack.com/about/)

Side-by-side facts with sources, last checked 2026-11-09.

**Verdict:** ThetaData: free tier, no card. Massive (Polygon): free tier: end-of-day data, 5 req/min, no card. Safety score: ThetaData 90%, Massive (Polygon) 90%. They differ on assets, pricing, rate limits; the table below shows each fact with its source.

| Field | [ThetaData](https://tradingagentstack.com/tool/thetadata/) | [Massive (Polygon) API](https://tradingagentstack.com/tool/massive-polygon-api/) |
| --- | --- | --- |
| Category | Market data APIs | Market data APIs |
| Assets | stocks, options, indices, interest rates | stocks, options, indices, forex, futures |
| Live vs paper | data only | data only |
| Order approval / safety | n/a | n/a |
| Pricing / free tier | free tier, no card; options plans (individual use) $40, $80, $160/mo (Value, Standard, Pro); separate stocks, indices and rates plans | free tier: end-of-day data, 5 req/min, no card; Stocks Starter $29/mo (15-min delayed, includes full-market snapshot); Developer $79/mo (15-min delayed); Advanced $199/mo (real-time) |
| Rate limits | concurrent-request caps by plan (options: 2 / 4 / 8) | free: 5 API calls/min; paid plans: unlimited API calls |
| Official / community | official | official |
| Last checked | 2026-11-09 | 2026-11-09 |
| Source | [www.thetadata.net](https://www.thetadata.net/subscribe) | [massive.com](https://massive.com/stocks) |
| Website | [Visit ThetaData](https://tradingagentstack.com/go/thetadata/?from=/compare/thetadata-vs-massive/) | [Visit Massive (Polygon) API](https://tradingagentstack.com/go/massive-polygon-api/?from=/compare/thetadata-vs-massive/) |

Both are listed under [Market data APIs](https://tradingagentstack.com/category/data-api/), where every tool in the category is shown with the same sourced facts.

Tool pages: [ThetaData](https://tradingagentstack.com/tool/thetadata/) · [Massive (Polygon) API](https://tradingagentstack.com/tool/massive-polygon-api/). Categories: [Market data APIs](https://tradingagentstack.com/category/data-api/)

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- [All comparisons](https://tradingagentstack.com/compare/)

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