# Meteomatics Weather API vs Stormglass API

> Meteomatics Weather scores 49.6 (D) to Stormglass's 39.9 (E) for weather forecasts. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/meteomatics-vs-stormglass
- Markdown: https://www.anchorterminal.com/compare/meteomatics-vs-stormglass.md (~2,950 tokens)
- Slim: https://www.anchorterminal.com/compare/meteomatics-vs-stormglass.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/meteomatics-vs-stormglass.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

Meteomatics Weather API scores 49.6 (D) on agent readiness against Stormglass API's 39.9 (E), and leads in 5 of 7 scored categories. Stormglass API leads on payments & pricing. Both do weather forecasts.

- Meteomatics Weather API: grade D, 49.6/100, rank #790 of 950. Markdown https://www.anchorterminal.com/tools/meteomatics.md · JSON https://www.anchorterminal.com/api/v1/tools/meteomatics.json
- Stormglass API: grade E, 39.9/100, rank #914 of 950. Markdown https://www.anchorterminal.com/tools/stormglass.md · JSON https://www.anchorterminal.com/api/v1/tools/stormglass.json
- Best weather and climate data APIs for AI agents: https://www.anchorterminal.com/best/weather/index.md
- All 120 weather comparisons: https://www.anchorterminal.com/compare/weather/index.md

## Which one, for what

### Meteomatics Weather API (D)

Good for: Companies in energy, aviation, insurance and logistics that need many models, long history, polygon and route queries and an SLA, and will buy by contract.

Ahead on:
- Schema & documentation, 71 against 40
- Agent ergonomics, 80 against 65
- Security & auth, 54 against 44
- Maintenance & community, 42 against 15
- Transparency & trust, 59 against 45

Watch for: No public price, free tier or self-serve signup found. Credentials arrive by email after a sales conversation

### Stormglass API (E)

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.

Ahead on:
- Payments & pricing, 25 against 0

Watch for: No OpenAPI file, llms.txt, official SDK or changelog was found. The docs are eleven Markdown pages


## Score by category

| Category | Weight | Meteomatics Weather API | Stormglass API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 34 | 34 | even |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 71 | 40 | Meteomatics Weather API +31 |
| Agent ergonomics | 13% (16.2 this run) | 80 | 65 | Meteomatics Weather API +15 |
| Security & auth | 14% (17.5 this run) | 54 | 44 | Meteomatics Weather API +10 |
| Payments & pricing | 10% (12.5 this run) | 0 | 25 | Stormglass API +25 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 42 | 15 | Meteomatics Weather API +27 |
| Transparency & trust | 7% (8.8 this run) | 59 | 45 | Meteomatics Weather API +14 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **49.6 · D** | **39.9 · E** | |

## Facts side by side

| Fact | Meteomatics Weather API | Stormglass API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Meteomatics AG | Storm Glass AB |
| Hosted endpoint | `https://api.meteomatics.com` | `https://api.stormglass.io/v2` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Meteomatics' general terms and conditions. The Python connector on GitHub is MIT | Proprietary service under Storm Glass AB's Terms and Conditions. The Free and Small plans are not for commercial use |
| Tools exposed | 9 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | no |
| Last release | 2026-08-24 | 2026-02-26 |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | no date given |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 56 stars, 16k PyPI/wk | none |

## Verdicts

**Meteomatics Weather API.** A public OpenAPI file, a hosted MCP server whose nine tools are all marked read-only, a published SLA with compensation and ISO 27001 certification suit company use. Access needs a sales contract, with no public price, free tier or self-serve signup found, no status page, and REST calls that authenticate with a username and password.

**Stormglass API.** A read-only weather and marine API with about 70 hourly parameters, per-source values from named national models, tide data and ERA5 history from 2014. No OpenAPI file, status page, SDK or security page was found, the free plan allows 10 requests a day, and the docs and FAQ disagree on the status code for a spent quota.

## Before you call either

### Meteomatics Weather API

1. Ask the account owner for credentials first. There is no signup, and both the REST API and the MCP server need a Meteomatics account with API access
2. Build REST URLs as validdatetime/parameters/location/format, for example `2026-10-08T00:00:00Z/t_2m:C/52.52,13.40/json`. Parameter names carry their unit after a colon
3. Keep each query to 10 locations and 10 parameters unless the contract says otherwise, and use POST when a GET URL passes 2,000 characters
4. Send credentials or the token in the `Authorization` header. Avoid the documented `access_token` query parameter, which puts the token in URLs and logs
5. Read `/user_stats_json` before a large job. It reports queries sent and the contract's limits, and 429 means a limit is spent
6. Treat reserved values such as -888 and -999 as invalid or missing data, and shrink the request when a 408 arrives after the 300-second timeout

### Stormglass API

1. Send the key as `Authorization: KEY` with no Bearer prefix. A missing or wrong key returns 403 with `{"errors":{"key":"API key is invalid"}}`
2. Always pass `source=sg` or a short source list on `/weather/point`. The default is every source, which multiplies the size of each hourly record
3. Treat 402 as a spent daily quota, not a billing failure, and stop until the next day. Read `meta.requestCount` against `meta.dailyQuota` on each response
4. Use `/historical/point` for past dates, at most 10 days a call and nothing newer than about 7 days. `/weather/point` looks back 14 days only
5. Send and read all times in UTC. Tide sea levels are relative to the chosen datum (MSL by default) and are not water depth

## Questions

### Which is better for AI agents, Meteomatics Weather API or Stormglass API?

Meteomatics Weather API scores 49.6 (D) on agent readiness against Stormglass API's 39.9 (E), and leads in 5 of 7 scored categories. Stormglass API leads on payments & pricing.

### Do Meteomatics Weather API and Stormglass API need an API key?

Meteomatics Weather API takes an API key or an OAuth sign-in. Stormglass API needs an API key.

### Can an agent call Meteomatics Weather API and Stormglass API without installing anything?

Yes. Meteomatics Weather API has a hosted endpoint at https://api.meteomatics.com and Stormglass API at https://api.stormglass.io/v2.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/meteomatics-vs-stormglass.json, and with the fewest tokens: https://www.anchorterminal.com/compare/meteomatics-vs-stormglass.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "meteomatics", "b": "stormglass"}`. From a terminal: `anchor compare meteomatics stormglass`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/meteomatics.json and https://www.anchorterminal.com/api/v1/tools/stormglass.json

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