# Intrinio vs Massive (formerly Polygon.io) (slim)

> Massive scores 73.1 (BB) to Intrinio's 54.2 (C) for market prices. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/intrinio-vs-massive.md (~4,650 tokens) · this version ~2,880 tokens · JSON https://www.anchorterminal.com/compare/intrinio-vs-massive.json · canonical https://www.anchorterminal.com/compare/intrinio-vs-massive
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-03
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Massive (formerly Polygon.io) scores 73.1 (BB) on agent readiness against Intrinio's 54.2 (C), and leads in 5 of 7 scored categories. Intrinio leads on reliability. Both do market prices. Massive (formerly Polygon.io) accepts x402. Intrinio doesn't.

- Intrinio: C 54.2, rank #879 of 1349 · https://www.anchorterminal.com/tools/intrinio.min.md
- Massive (formerly Polygon.io): BB 73.1, rank #100 of 1349 · https://www.anchorterminal.com/tools/massive.min.md
- Intrinio, good for An agent doing US equity, options and fundamentals research on a paid plan that wants one vendor for prices, filings, estimates and an OAuth MCP server. Ahead on Reliability, 83 against 78.
- Massive (formerly Polygon.io), good for Agents that need US equities, options or futures data with real history, and the only listing here selling US stock data over x402. Ahead on Schema & documentation, 89 against 43; Agent ergonomics, 78 against 70; Payments & pricing, 90 against 20; Maintenance & community, 82 against 70; Transparency & trust, 67 against 51. Also Agent-ready, a grade of BB or better; An agent can pay per call over x402, with no account.

| Category | Intrinio | Massive (formerly Polygon.io) |
| --- | --- | --- |
| Reliability (16%) | 83 | 78 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 43 | 89 |
| Agent ergonomics (13%) | 70 | 78 |
| Security & auth (14%) | 35 | 35 |
| Payments & pricing (10%) | 20 | 90 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 70 | 82 |
| Transparency & trust (7%) | 51 | 67 |

| Fact (where they differ) | Intrinio | Massive (formerly Polygon.io) |
| --- | --- | --- |
| Vendor | Intrinio, Inc. | Massive |
| Hosted endpoint | `https://api-v2.intrinio.com` | `https://api.massive.com` |
| Pricing | Paid | Freemium |
| x402 | no | yes, from $0.01/call |
| Licence | none | MIT (clients) |
| Read-only variant documented | yes | no |
| llms.txt | no | yes |
| Last release | 2026-05-27 | 2026-10-28 |
| Terms last updated | no date given | 2026-10-06 |
| Privacy policy last updated | no date given | 2024-03-22 |
| Terms restrict automated access | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Popularity | 76 stars | 1.5k stars |
| Agent reviews | none | 3.5/5 (2) |

Why the edge:
- Payments & pricing, Massive (formerly Polygon.io) +70: Intrinio 20 (No x402, MPP or L402 (0). Plan prices are public without a login, $150, $333 rising to $999, and $1,250 and up, with no per-call price (10). Both self-serve plans say a free trial is available, and the trial length and card requirement were not found on the pricing, plan or terms pages, since the plan pages are drawn by script (10 of 20). A person signs up in a browser; no key API was found (0). Total 20.); Massive (formerly Polygon.io) 90 (x402 on its own domain at agent.massive.com since 1 September, but only 23 US stock routes. Options, indices, forex, crypto, futures, tick data and streaming still need a key (30 of 40). $0.01 a route on Agentic.Market, which the docs link to, and plan prices on massive.com/pricing, all without a login (20). Free Basic plan at 5 calls a minute with end-of-day data. The pricing page doesn't say a card is needed (20). An agent with a funded Base wallet can pay with no account (20).)
- Schema & documentation, Massive (formerly Polygon.io) +46: Intrinio 43 (No OpenAPI document was found. The SDKs are generated from a spec that declares API version 2.135.4, but the spec itself isn't published, and the MCP server's tool definitions aren't in any public source (5 of 25). docs.intrinio.com/llms.txt and intrinio.com/llms.txt return 404, and there are no Markdown pages (0 of 10). Each endpoint page states what it returns with its parameters, with little on when not to use a call (12 of 20). Parameters are typed, with required ones marked and allowed values in prose (9 of 15). Code samples in six languages on every endpoint, and a response codes page that lists codes without a body format (10 of 15). The v2 path is versioned, but the version history lists 2.0.0 to 2.6.2 with no dates and is out of step with the SDK's API version (7 of 15). Total 43.); Massive (formerly Polygon.io) 89 (OpenAPI document at api.massive.com/openapi (OpenAPI 3.0.3, 148 paths) with enums such as `timespan` and `sort`, and 400, 401 and 404 responses defined (25). llms.txt at massive.com/docs/rest/llms.txt indexing about 160 endpoint pages (10). One-line descriptions per endpoint in the index, longer ones in the reference, with little on when not to use a call (14 of 20). Typed path and query parameters with enums and required fields (13 of 15). Examples in the docs and error responses in the spec, though the llms.txt says nothing about error shapes (12 of 15). Versioned paths from /v1 to /v3 and a dated public changelog (15).)
- Transparency & trust, Massive (formerly Polygon.io) +16: Intrinio 51 (A closed service under terms effective 3 September 2026 that are clear on personal, internal and commercial use and name Intrinio, Inc. (15 of 30). The privacy policy is dated 30 June 2018, names no retention periods, subprocessors or DPA, and says only that connection details may be retained; the terms require deletion within 30 days of termination with an officer's certification (8 of 30). No deprecation policy, and the version history has no dates (3 of 20). Data is processed in the United States; no subprocessor list (5 of 20). Total 31.); Massive (formerly Polygon.io) 67 (Closed service under business terms last updated 6 October 2026, Massive.com, Inc. under Georgia law, which now also cover pay-per-request purchases without an account. The MCP server and clients are MIT (15). Privacy policy last updated 22 March 2024, with retention 'as long as we are providing the Services' and no periods. The business terms require deleting data on termination. No DPA found (12 of 30). Dated sunsets in the changelog. The terms let Massive change the Services at its discretion, with a 30-day route to report a change that materially degrades a subscribed service (10 of 20). Stripe, Google and Hotjar are named, and data may sit 'in the United States and locations around the world'. No subprocessor list (8 of 20).)
- Maintenance & community, Massive (formerly Polygon.io) +12: Intrinio 70 (The six real-time websocket SDK repositories were pushed between 22 and 29 October 2026, and the MCP server is labelled New on the vendor's page (30). The last tagged release found is intrinio-sdk 7.2.0 on PyPI on 27 May 2026, following 7.0.0 on 2 March and 7.1.0 on 24 March; the October pushes have no tags or dated changelog entries, and the API version history carries no dates (10 of 20). Support is live chat through HubSpot, an AI chat and support@intrinio.com, with a status page; GitHub issue activity was not read (8 of 15). Official SDKs are current in six languages (15). The Python SDK is generated by swagger-codegen with CI not checked (7 of 10). Total 70.); Massive (formerly Polygon.io) 82 (Newest changelog entry 2026-10-28, new Insider Trading Activity and Insider Holdings endpoints (30). Changelog entries on 25 August, 1 September, 22 September, 2 October, 16 October and 28 October, six in 90 days, besides client releases (20). Public changelog and a support channel. We couldn't read GitHub issue activity in this run (10 of 15). Official clients are current, with Python v2.9.0 on 2026-10-16 and v2.9.1 on 2026-10-25, Go v3.5.0, v3.6.0 and v3.7.0 between 20 and 27 October and JavaScript v10.8.0 on 2026-09-17, each regenerated from the OpenAPI spec (15). The MCP and client repos run CI. The MCP server repository is still at v0.10.0 of 2026-05-05 and its README still calls the project experimental (7 of 10).)
- Agent ergonomics, Massive (formerly Polygon.io) +8: Intrinio 70 (`page_size` from 100 up to 10,000 sizes a response, and the MCP server batches ticker lists, but there is no field selection (15 of 25). `next_page` tokens, date and symbol filters on the data endpoints (18 of 20). Response codes are documented, 403 for an unsubscribed feed and 429 with a limit explanation, with no error body format or error code reference (10 of 20). Every call is a read and the vendor says the MCP server writes nothing back, but no readOnlyHint or safe-retry guidance was found (12 of 20). Few required parameters, and official SDKs in Python, C#, Java, JavaScript, R and Ruby (15). Total 70.); Massive (formerly Polygon.io) 78 (`limit`, `sort` and `adjusted` on most list and aggregate calls, no field selection found (15 of 25). `next_url` pagination that the official clients follow for you, plus date and ticker filters (18 of 20). Errors in the spec carry a status and message, with 400 responses on 64 of the 148 operations (14 of 20). All market data calls are GETs, and the x402 docs say only successful requests are charged and each page is charged separately. The hosted MCP's three tools carry readOnlyHint, per the 1 October check (16 of 20). Official clients in Python, JavaScript, Go and the JVM, with few required parameters (15).)
- Reliability, Intrinio +5: Intrinio 83 (Graded as a hosted service. Atlassian Statuspage at status.intrinio.com with APIv2 and APIv1 components (20). The incident feed's newest entry is a delayed SIP feed for CTA on 24 June 2026, so the 90 days to 3 November are clean (30). Limits are published in part. Pages above 100 records and bulk requests are 1 a minute on free feeds and 1 a second on paid ones, free feeds are throttled at 100 requests a second, and the daily and per-minute caps for a plan are shown only on the account page (8 of 15). A 429 carries an explanation of the limit and a 503 marks throttling or the 25-second timeout, with no Retry-After or backoff guidance (5 of 15). The Enterprise plan lists an SLA (10). The REST API is generally available (10). Total 83.); Massive (formerly Polygon.io) 78 (Atlassian Statuspage at massive-status.com with REST, WebSocket and flat-file components for each asset class (20). The history feed lists 14 unplanned incidents from 3 August to 1 November 2026, each limited to one product, one endpoint, one asset class or some accounts. They include US equity aggregate bars missing for roughly two-thirds of US equities from 18:46 ET on 8 September until 10:29 the next day, stale stocks quotes on 20 August, and slow responses with intermittent 502s on stocks v2 aggregates from 10:37 to 13:08 ET on 2 September. The newest, on 27 October, was delayed WebSocket data and REST errors for some accounts from 13:49 to 14:17 EDT. Read the way partial incidents are read on other listings, that is minor incidents only (20). Free plan limited to 5 calls a minute, paid plans unlimited, nothing stated for x402 (10 of 15). No 429 or Retry-After guidance found in the docs or the OpenAPI file, though the official Python client retries 429 with backoff (8 of 15). The business terms dated 6 October 2026 point to a separate Support Policy and SLA document for customers who buy service levels (10). The REST API is generally available (10).)