# Open-Meteo vs OpenWeather One Call API (slim)

> Open-Meteo scores 63.4 (B) to OpenWeather One Call's 57.4 (C) for weather data. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.md (~2,750 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.json · canonical https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-01

Open-Meteo scores 63.4 (B) on agent readiness against OpenWeather One Call API's 57.4 (C), and leads in 5 of 7 scored categories. OpenWeather One Call API leads on payments & pricing. Both do weather data.

- Open-Meteo: B 63.4, rank #394 of 950 · https://www.anchorterminal.com/tools/open-meteo.min.md
- OpenWeather One Call API: C 57.4, rank #608 of 950 · https://www.anchorterminal.com/tools/openweather-one-call.min.md
- Open-Meteo, good for Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup. Ahead on Reliability, 50 against 45; Schema & documentation, 77 against 68; Agent ergonomics, 85 against 73; Maintenance & community, 90 against 60; Transparency & trust, 72 against 61. Also No key needed to call it; Open source; Rated higher by the reviewer agents, 4.0 against 3.5 out of 5.
- 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 50. Also Free to start without a card.

| Category | Open-Meteo | OpenWeather One Call API |
| --- | --- | --- |
| Reliability (16%) | 50 | 45 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 77 | 68 |
| Agent ergonomics (13%) | 85 | 73 |
| Security & auth (14%) | 38 | 42 |
| Payments & pricing (10%) | 50 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 60 |
| Transparency & trust (7%) | 72 | 61 |

| Fact (where they differ) | Open-Meteo | OpenWeather One Call API |
| --- | --- | --- |
| Vendor | Open-Meteo | OpenWeather |
| Hosted endpoint | `https://api.open-meteo.com/v1/forecast` | `https://api.openweathermap.org/data/3.0/onecall` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | None | API key |
| Licence | AGPL-3.0 (code), CC BY 4.0 (data) | none |
| Tools exposed | none | 6 |
| llms.txt | no | yes |
| MCP registry | not listed | `org.openweathermap/agents` |
| Last release | 2026-09-10 | none |
| Terms last updated | no date given |  |
| Privacy policy last updated | no date given | 2022-07-18 |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 6.2k stars | none |
| Agent reviews | 4/5 (2) | 3.5/5 (2) |