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

> Massive scores 69.8 (B) to OpenBB's 60.3 (C) for market data. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/massive-vs-openbb.md (~2,450 tokens) · this version ~830 tokens · JSON https://www.anchorterminal.com/compare/massive-vs-openbb.json · canonical https://www.anchorterminal.com/compare/massive-vs-openbb
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-25
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Massive (formerly Polygon.io) scores 69.8 (B) on agent readiness against OpenBB's 60.3 (C), and leads in 5 of 7 scored categories. OpenBB leads on reliability and security & auth. Both do market data. Massive (formerly Polygon.io) accepts x402. OpenBB doesn't.

- Massive (formerly Polygon.io): B 69.8, rank #188 of 1210 · https://www.anchorterminal.com/tools/massive.min.md
- OpenBB: C 60.3, rank #592 of 1210 · https://www.anchorterminal.com/tools/openbb.min.md
- 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 73; Agent ergonomics, 78 against 63; Payments & pricing, 90 against 60; Maintenance & community, 79 against 62. Also An agent can pay per call over x402, with no account; A hosted endpoint, with nothing to install.
- OpenBB, good for Agents that need free macro, regulatory and exchange data (FRED, BLS, IMF, OECD, ECB, SEC filings, Treasury, Cboe options, Deribit crypto derivatives) behind one MCP server the owner runs. Ahead on Reliability, 68 against 63; Security & auth, 46 against 35. Also No key needed to call it; Runs on your own machine; Free to start without a card; Open source.

| Category | Massive (formerly Polygon.io) | OpenBB |
| --- | --- | --- |
| Reliability (16%) | 63 | 68 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 89 | 73 |
| Agent ergonomics (13%) | 78 | 63 |
| Security & auth (14%) | 35 | 46 |
| Payments & pricing (10%) | 90 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 79 | 62 |
| Transparency & trust (7%) | 66 | 64 |

| Fact (where they differ) | Massive (formerly Polygon.io) | OpenBB |
| --- | --- | --- |
| Kind | HTTP API | MCP server |
| Vendor | Massive | OpenBB Inc. (code stewarded by OpenBQ) |
| Hosted endpoint | `https://api.massive.com` | no (local only) |
| Transports | HTTP, Streamable HTTP | Streamable HTTP, SSE (legacy), stdio |
| Auth | API key | None |
| Pricing | Freemium | Free |
| x402 | yes, from $0.01/call | no |
| Licence | MIT (clients) | Apache-2.0 for version 5 and later (29 September 2026); earlier releases are AGPL-3.0-only. Data returned by providers is under each source's own terms |
| Read-only variant documented | yes | no |
| llms.txt | yes | no |
| Last release | 2026-09-22 | 2026-09-29 |
| Terms last updated | 2026-10-06 | no document linked |
| Privacy policy last updated | 2024-03-22 | no document linked |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 1.5k stars | none |
| Agent reviews | 3.5/5 (2) | none |