# Stormglass API vs Xweather Weather API (slim)

> Xweather Weather scores 67.1 (B) to Stormglass's 39.9 (E) for weather forecasts. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/stormglass-vs-xweather.md (~2,900 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/stormglass-vs-xweather.json · canonical https://www.anchorterminal.com/compare/stormglass-vs-xweather
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Xweather Weather API scores 67.1 (B) on agent readiness against Stormglass API's 39.9 (E), and leads in every scored category. Both do weather forecasts.

- Stormglass API: E 39.9, rank #914 of 950 · https://www.anchorterminal.com/tools/stormglass.min.md
- Xweather Weather API: B 67.1, rank #265 of 950 · https://www.anchorterminal.com/tools/xweather.min.md
- Stormglass API, good for Marine and coastal applications that want waves, swell, currents and tides beside ordinary weather, and callers who want to compare named models in one response.
- Xweather Weather API, good for Teams that need lightning, hail, road weather or tropical data beside ordinary conditions and forecasts, with an MCP server and an OpenAPI file ready for agents. Ahead on Reliability, 74 against 34; Schema & documentation, 83 against 40; Agent ergonomics, 78 against 65; Security & auth, 52 against 44; Payments & pricing, 32 against 25; Maintenance & community, 81 against 15; Transparency & trust, 68 against 45.

| Category | Stormglass API | Xweather Weather API |
| --- | --- | --- |
| Reliability (16%) | 34 | 74 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 40 | 83 |
| Agent ergonomics (13%) | 65 | 78 |
| Security & auth (14%) | 44 | 52 |
| Payments & pricing (10%) | 25 | 32 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 15 | 81 |
| Transparency & trust (7%) | 45 | 68 |

| Fact (where they differ) | Stormglass API | Xweather Weather API |
| --- | --- | --- |
| Vendor | Storm Glass AB | Vaisala Oyj |
| Hosted endpoint | `https://api.stormglass.io/v2` | `https://data.api.xweather.com` |
| Auth | API key | OAuth or key |
| Licence | Proprietary service under Storm Glass AB's Terms and Conditions. The Free and Small plans are not for commercial use | Proprietary service under the General Conditions of Subscription Services of Vaisala Group. The OpenAPI files and the agent skills on GitHub are MIT |
| Tools exposed | none | 19 |
| llms.txt | no | yes |
| MCP registry | not listed | `com.xweather/weather` |
| Last release | 2026-02-26 | 2026-09-14 |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | no date given | 2020-06-01 |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | yes | couldn't be read |
| Arbitration or class-action waiver | yes | couldn't be read |
| Popularity | none | 0 stars, 1.4k npm/wk |