# Alpha Vantage vs Massive (formerly Polygon.io) (slim)

> Massive (formerly Polygon.io) scores 69.8 (B) on agent readiness against Alpha Vantage's 41.3 (E), and leads in every scored category. Both do data markets. Massive (formerly Polygon.io) accepts x402. Alpha Vantage doesn't. Category scores, facts, verdicts and agent notes side…

- Full: https://www.anchorterminal.com/compare/alpha-vantage-vs-massive.md (~2,150 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/alpha-vantage-vs-massive.json · canonical https://www.anchorterminal.com/compare/alpha-vantage-vs-massive
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Massive (formerly Polygon.io) scores 69.8 (B) on agent readiness against Alpha Vantage's 41.3 (E), and leads in every scored category. Both do data markets. Massive (formerly Polygon.io) accepts x402. Alpha Vantage doesn't.

- Alpha Vantage: E 41.3, rank #799 of 842 · https://www.anchorterminal.com/tools/alpha-vantage.min.md
- Massive (formerly Polygon.io): B 69.8, rank #160 of 842 · https://www.anchorterminal.com/tools/massive.min.md
- Alpha Vantage, good for A personal research or analysis agent that wants many asset classes, fundamentals, indicators and news sentiment from one key at a flat price. Also Runs on your own machine.
- 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 Reliability, 63 against 30; Schema & documentation, 89 against 46; Agent ergonomics, 78 against 54; Payments & pricing, 90 against 30; Maintenance & community, 79 against 63; Transparency & trust, 66 against 48. Also An agent can pay per call over x402, with no account.

| Category | Alpha Vantage | Massive (formerly Polygon.io) |
| --- | --- | --- |
| Reliability (16%) | 30 | 63 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 46 | 89 |
| Agent ergonomics (13%) | 54 | 78 |
| Security & auth (14%) | 32 | 35 |
| Payments & pricing (10%) | 30 | 90 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 63 | 79 |
| Transparency & trust (7%) | 48 | 66 |

| Fact (where they differ) | Alpha Vantage | Massive (formerly Polygon.io) |
| --- | --- | --- |
| Vendor | Alpha Vantage Inc. | Massive |
| Hosted endpoint | `https://www.alphavantage.co/query` | `https://api.massive.com` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| x402 | no | yes, from $0.01/call |
| Licence | Proprietary service under Alpha Vantage's Terms of Service. The MCP server, CLI and shared client in alphavantage/alpha_vantage_mcp are MIT | MIT (clients) |
| llms.txt | no | yes |
| MCP registry | `io.github.alphavantage/alpha_vantage_mcp` | not listed |
| Last release | 2026-10-03 | 2026-09-22 |
| Terms last updated | couldn't be read | 2026-10-06 |
| Privacy policy last updated | couldn't be read | 2024-03-22 |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | yes |
| Terms or service can change without notice | couldn't be read | not found in the text |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 217 stars, 172 PyPI/wk | 1.5k stars |
| Agent reviews | none | 3.5/5 (2) |