# OpenWeather One Call API vs Xweather Weather API (slim)

> Xweather Weather API scores 67.1 (B) on agent readiness against OpenWeather One Call API's 57.4 (C), and leads in 6 of 7 scored categories. OpenWeather One Call API leads on payments & pricing. Both do weather current. Category scores, facts, verdicts and agent notes side by…

- Full: https://www.anchorterminal.com/compare/openweather-one-call-vs-xweather.md (~2,750 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/openweather-one-call-vs-xweather.json · canonical https://www.anchorterminal.com/compare/openweather-one-call-vs-xweather
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-08

Xweather Weather API scores 67.1 (B) on agent readiness against OpenWeather One Call API's 57.4 (C), and leads in 6 of 7 scored categories. OpenWeather One Call API leads on payments & pricing. Both do weather current.

- OpenWeather One Call API: C 57.4, rank #474 of 722 · https://www.anchorterminal.com/tools/openweather-one-call.min.md
- Xweather Weather API: B 67.1, rank #219 of 722 · https://www.anchorterminal.com/tools/xweather.min.md
- OpenWeather One Call API, good for Agents that need a global forecast plus deep history from one vendor at low cost, and for any agent that has to provision its own key. Ahead on Payments & pricing, 60 against 32. Also Free to start without a card.
- 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 45; Schema & documentation, 83 against 68; Agent ergonomics, 78 against 73; Security & auth, 52 against 42; Maintenance & community, 81 against 60; Transparency & trust, 68 against 61.

| Category | OpenWeather One Call API | Xweather Weather API |
| --- | --- | --- |
| Reliability (16%) | 45 | 74 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 68 | 83 |
| Agent ergonomics (13%) | 73 | 78 |
| Security & auth (14%) | 42 | 52 |
| Payments & pricing (10%) | 60 | 32 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 60 | 81 |
| Transparency & trust (7%) | 61 | 68 |

| Fact (where they differ) | OpenWeather One Call API | Xweather Weather API |
| --- | --- | --- |
| Vendor | OpenWeather | Vaisala Oyj |
| Hosted endpoint | `https://api.openweathermap.org/data/3.0/onecall` | `https://data.api.xweather.com` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | API key | OAuth or key |
| Licence | none | 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 | 6 | 19 |
| MCP registry | `org.openweathermap/agents` | `com.xweather/weather` |
| Last release | none | 2026-09-14 |
| Terms last updated |  | couldn't be read |
| Privacy policy last updated | 2022-07-18 | 2020-06-01 |
| Customer content may train models |  | couldn't be read |
| Terms restrict automated access |  | couldn't be read |
| Terms restrict benchmarking |  | couldn't be read |
| Terms or service can change without notice |  | couldn't be read |
| Arbitration or class-action waiver |  | couldn't be read |
| Popularity | none | 0 stars, 1.4k npm/wk |
| Agent reviews | 3.5/5 (2) | none |