{ "data": { "a": { "slug": "meteosource-mcp", "name": "Meteosource Weather MCP", "vendor": "Meteosource", "vendorUrl": "https://www.meteosource.com", "kind": "mcp", "category": "weather", "summary": "Meteosource's hosted MCP server gives an agent seven tools for place search, forecasts, severe-weather alerts, air quality, 20 years of weather history, and solar and wind production estimates, with a Meteosource API key.", "url": "https://www.anchorterminal.com/tools/meteosource-mcp", "markdownUrl": "https://www.anchorterminal.com/tools/meteosource-mcp.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/meteosource-mcp.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/meteosource-mcp.json", "dns": "meteosource-mcp.grade.anchorterminal.com", "repo": "https://github.com/Meteosource/meteosource-weather-mcp", "license": "Proprietary service. The repository's MIT licence covers its docs and manifest", "transports": [ "streamable-http" ], "remoteUrl": "https://mcp.meteosource.com/mcp", "packages": [], "auth": "api-key", "authNotes": "A Meteosource API key in an Authorization: Bearer header (or X-API-Key). No OAuth. The key's plan decides which tools appear; the key is used only to call Meteosource and isn't stored in full.", "pricing": "freemium", "pricingNotes": "Free plan with 400 calls a day and no card, asking for a mention and backlink; Startup $9 a month (10,000 calls a day); Standard $29 a month; Renewables plan for production tools (checked 2026-11-07).", "priceSummary": "$9 / mo", "where": "hosted", "x402": { "level": "no", "evidence": "No x402, MPP or L402 on the MCP docs or pricing page (checked 2026-11-07).", "endpoints": [] }, "toolCount": 7, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-11-07" }, "docsUrl": "https://mcp.meteosource.com", "registryName": "com.meteosource/weather", "capabilities": [ "weather.forecast", "weather.historical", "weather.alerts", "weather.air-quality", "energy.solar" ], "tags": [ "official", "hosted", "mcp", "remote-mcp", "api-key", "freemium", "free-tier", "mcp-registry" ], "graded": true, "anchor": { "graded": true, "score": 50.9, "grade": "D", "agentReady": false, "rank": 1048, "ranked": true, "rankOf": 1510, "categoryRank": 12, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 75, "maintenance": 70, "payments": 30, "reliability": 35, "schema": 72, "security": 42, "transparency": 32 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-07" }, "negative": 0, "verdict": "Meteosource's MCP server is a small, clear weather toolset, seven tools covering forecasts, alerts, air quality, history and renewable production, with error messages that tell the agent what to do. It uses a plain API key, has no status page we could reach, and its terms weren't found.", "bestFor": "Agents that answer weather questions, plan around severe weather or estimate solar and wind output.", "strengths": [ "Seven compact tools with plan requirements in the descriptions", "Documented error messages with fixes", "Forecasts, alerts, air quality, 20 years of history and solar and wind production", "Free plan with 400 calls a day and no card", "Official registry entry" ], "weaknesses": [ "Plain API key, no OAuth", "No tool annotations", "Status page unreachable and no incident history", "Terms and privacy not found" ], "agentNotes": [ "Call search_places first to resolve a location", "Split history requests over 400 location-days into shorter ranges", "Production tools need the Renewables plan; check which tools the key exposes", "Send the key in a header, never in a URL" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 50.9 } ], "editorialScores": { "ergonomics": 75, "maintenance": 70, "payments": 30, "reliability": 35, "schema": 72, "security": 42, "transparency": 25 }, "provenanceScore": 38, "checked": { "categories": { "ergonomics": "2026-11-07", "maintenance": "2026-11-07", "payments": "2026-11-07", "reliability": "2026-11-07", "schema": "2026-11-07", "security": "2026-11-07", "transparency": "2026-11-07" }, "last": "2026-11-07", "oldest": "2026-11-07", "stale": false, "staleAfterDays": 90 } }, "connect": { "claudeCode": "claude mcp add meteosource --transport http https://mcp.meteosource.com/mcp --header \"Authorization: Bearer $METEOSOURCE_API_KEY\"", "config": { "mcpServers": { "meteosource": { "headers": { "Authorization": "Bearer YOUR_METEOSOURCE_API_KEY" }, "url": "https://mcp.meteosource.com/mcp" } } } }, "letme": { "capability": "https://letme.dev/weather.forecast", "tool": "https://letme.dev/meteosource-mcp" }, "area": "domain-data", "unitPrices": [ { "item": "Startup plan", "unit": "month", "usd": 9, "note": "10,000 calls a day" }, { "item": "Standard plan", "unit": "month", "usd": 29, "note": "20,000 calls a day" } ], "provenance": { "legalEntity": "Meteosource", "domain": "meteosource.com", "domainRegistered": "", "domainNote": "Not looked up: RDAP isn't requested under the 1 November 2026 rules.", "endpointOnVendorDomain": true, "terms": "", "privacy": "", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-11-07", "notes": [ "The repository licence names Meteosource (2026). Terms and privacy URLs weren't found at the usual paths." ], "score": 38 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/meteosource-mcp.json", "live": { "slug": "meteosource-mcp", "probe": { "target": "https://mcp.meteosource.com/mcp", "method": "mcp-initialize", "lastAt": "2026-11-08T00:55:52.070466931Z", "lastOk": true, "lastStatus": 200, "lastMs": 108, "lastNote": "initialize answered", "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 151, "p95ms24h": 199, "samples24h": 63, "samples30d": 63, "days": [ { "date": "2026-11-07", "probes": 53, "ok": 53 }, { "date": "2026-11-08", "probes": 10, "ok": 10 } ] }, "updatedAt": "2026-11-08T00:55:52.070466931Z" } }, "answer": "Open-Meteo scores 66.7 (B) on agent readiness against Meteosource Weather MCP's 50.9 (D), and leads in 6 of 7 scored categories.", "b": { "slug": "open-meteo", "name": "Open-Meteo", "vendor": "Open-Meteo", "vendorUrl": "https://open-meteo.com", "kind": "http-api", "category": "data-providers", "summary": "Open-source weather API over 30+ national and global weather models, with forecasts, historical reanalysis back to 1940 and no key for non-commercial use.", "url": "https://www.anchorterminal.com/tools/open-meteo", "markdownUrl": "https://www.anchorterminal.com/tools/open-meteo.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/open-meteo.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/open-meteo.json", "dns": "open-meteo.grade.anchorterminal.com", "repo": "https://github.com/open-meteo/open-meteo", "license": "AGPL-3.0 (code), CC BY 4.0 (data)", "transports": [ "http" ], "remoteUrl": "https://api.open-meteo.com/v1/forecast", "packages": [], "auth": "none", "authNotes": "No key for non-commercial use. Commercial plans add `\u0026apikey=` on customer-api.open-meteo.com.", "pricing": "freemium", "pricingNotes": "Free for non-commercial use at 600 calls a minute, 5,000 an hour, 10,000 a day and 300,000 a month. Commercial plans for 1M, 5M and 50M+ calls a month show prices only at Stripe checkout, and monthly caps aren't enforced yet, with email alerts at 80, 90 and 100 per cent instead (https://open-meteo.com/en/pricing).", "priceSummary": "Freemium", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 6200, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-26" }, "docsUrl": "https://open-meteo.com/en/docs", "openapi": "https://github.com/open-meteo/open-meteo/blob/main/openapi/forecast.yml", "capabilities": [ "data.weather" ], "tags": [ "hosted", "no-key", "open-data", "open-source", "free-tier" ], "lastRelease": "2026-10-16", "graded": true, "anchor": { "graded": true, "score": 66.7, "grade": "B", "agentReady": false, "rank": 361, "ranked": true, "rankOf": 1510, "categoryRank": 4, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 65, "schema": 77, "security": 38, "transparency": 75 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-02" }, "negative": 0, "verdict": "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.", "bestFor": "Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.", "strengths": [ "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day", "OpenAPI 3.1 files for nine APIs with an enum for every weather variable", "Four releases between 1 September and 16 October 2026, AGPL-3.0 code and CC BY 4.0 data", "Logs deleted after 90 days and no cookies or trackers, per the terms", "Official Python and TypeScript SDKs" ], "weaknesses": [ "Commercial prices appear only at Stripe checkout", "The commercial key is sent as `\u0026apikey=` in the URL", "Status page is uptime monitors with no incident history we could read", "Terms change on posting and IPs can be blocked without notice", "No llms.txt, no official MCP server, and the OpenAPI files aren't linked from the docs" ], "agentNotes": [ "Name only the variables you need in `hourly=` or `daily=`, because each one adds a full time series", "Credit 'Weather data by Open-Meteo.com' wherever you show the data", "Use customer-api.open-meteo.com with `\u0026apikey=` for anything commercial, and keep that URL out of logs", "Read `reason` on a 400. It names the bad parameter", "Cache by coordinate and model run, since global models update about every six hours" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 4, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "B", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 66.7 } ], "editorialScores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 65, "schema": 77, "security": 38, "transparency": 75 }, "provenanceScore": 74, "dataQualityScore": 80, "checked": { "categories": { "ergonomics": "2026-11-02", "maintenance": "2026-11-02", "payments": "2026-11-02", "reliability": "2026-11-02", "schema": "2026-11-02", "security": "2026-11-02", "transparency": "2026-11-02" }, "last": "2026-11-02", "lastMoved": "2026-11-02", "oldest": "2026-11-02", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl \"https://api.open-meteo.com/v1/forecast?latitude=51.51\u0026longitude=-0.13\u0026hourly=temperature_2m,precipitation\u0026forecast_days=2\"" }, "letme": { "capability": "https://letme.dev/data.weather", "tool": "https://letme.dev/open-meteo" }, "alsoIn": [ "weather" ], "area": "web-data", "provenance": { "legalEntity": "OpenMeteo GmbH", "domain": "open-meteo.com", "domainRegistered": "2021-04-27", "endpointOnVendorDomain": true, "terms": "https://open-meteo.com/en/terms", "privacy": "https://open-meteo.com/en/terms#privacy", "statusPage": "https://status.open-meteo.com", "changelog": "", "securityTxt": "none", "checked": "2026-09-26", "score": 74 }, "dataQuality": { "coverage": "Global at 1 to 15 km, 16-day forecasts, 30+ weather models", "coverageRating": 4, "freshness": "Global models about every 6 hours, regional models every 1 to 3", "freshnessClass": "hourly", "history": "Reanalysis from 1940", "historyYears": 86, "methodology": "https://open-meteo.com/en/docs/historical-weather-api", "sourcesDisclosed": true, "licence": "CC BY 4.0", "licenceClass": "open", "standing": "", "standingClass": "none", "reuse": "CC BY 4.0, so caching and redistribution are fine with credit. Commercial use of the API needs a paid plan.", "score": 80, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/open-meteo.json", "live": { "slug": "open-meteo", "probe": { "target": "https://api.open-meteo.com/v1/forecast", "method": "get", "lastAt": "2026-11-08T00:55:55.450315568Z", "lastOk": true, "lastStatus": 200, "lastMs": 199, "authRequired": false, "uptime24h": 99.59, "uptime30d": 98.96, "p50ms24h": 132, "p95ms24h": 234, "samples24h": 244, "samples30d": 7704, "days": [ { "date": "2026-10-08", "probes": 268, "ok": 267 }, { "date": "2026-10-09", "probes": 250, "ok": 247 }, { "date": "2026-10-10", "probes": 247, "ok": 246 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 244 }, { "date": "2026-10-13", "probes": 248, "ok": 244 }, { "date": "2026-10-14", "probes": 249, "ok": 242 }, { "date": "2026-10-15", "probes": 253, "ok": 249 }, { "date": "2026-10-16", "probes": 252, "ok": 248 }, { "date": "2026-10-17", "probes": 253, "ok": 236 }, { "date": "2026-10-18", "probes": 256, "ok": 254 }, { "date": "2026-10-19", "probes": 255, "ok": 244 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 248 }, { "date": "2026-10-28", "probes": 251, "ok": 251 }, { "date": "2026-10-29", "probes": 248, "ok": 248 }, { "date": "2026-10-30", "probes": 249, "ok": 248 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 232 }, { "date": "2026-11-03", "probes": 248, "ok": 247 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 184 }, { "date": "2026-11-06", "probes": 241, "ok": 241 }, { "date": "2026-11-07", "probes": 243, "ok": 242 }, { "date": "2026-11-08", "probes": 10, "ok": 10 } ], "outages": [ { "start": "2026-11-02T14:54:47.711050491Z", "end": "2026-11-02T15:47:32.653665135Z", "note": "HTTP 503 server error" }, { "start": "2026-11-02T14:14:33.538639921Z", "end": "2026-11-02T14:48:48.11955889Z", "note": "HTTP 503 server error" }, { "start": "2026-10-19T12:25:54.511284258Z", "end": "2026-10-19T12:42:43.671872453Z", "note": "HTTP 503 server error" }, { "start": "2026-10-17T12:01:58.154195913Z", "end": "2026-10-17T12:24:19.170255715Z", "note": "HTTP 503 server error" } ] }, "vendorStatus": { "page": "https://status.open-meteo.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-08T00:31:53.223569694Z" }, "versions": [ { "registry": "github", "name": "open-meteo/open-meteo", "version": "1.8.0", "released": "2026-11-03", "seenAt": "2026-11-06T23:51:24.088670677Z" } ], "githubStars": 6610, "securityTxt": { "url": "https://open-meteo.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:00:48.011168915Z" }, "domain": { "domain": "open-meteo.com", "registered": "2021-04-27", "source": "https://rdap.verisign.com/com/v1/domain/open-meteo.com", "checkedAt": "2026-11-01T14:23:57.368902098Z" }, "pages": [ { "url": "https://open-meteo.com/en/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-11-07T14:15:20.936319246Z", "changedAt": "2026-11-05T12:38:16.103241291Z", "fingerprint": "33ae3875be94" }, { "url": "https://open-meteo.com/en/terms", "kind": "terms", "status": 200, "checkedAt": "2026-11-07T14:15:23.053118897Z", "changedAt": "2026-11-05T12:38:18.244368506Z", "fingerprint": "0e54243cf014" } ], "github": { "repo": "open-meteo/open-meteo", "checkedAt": "2026-11-02T09:12:34.634358214Z", "stars": 6567, "archived": false, "issuesEnabled": true, "pushedAt": "2026-11-01T21:46:35Z", "openIssues": 139, "openPRs": 17, "issuesOpened90d": 74, "issuesClosed90d": 68, "prsMerged90d": 119, "ci": { "branch": "main", "runs": 50, "success": 50, "failure": 0, "other": 0, "latest": "success", "latestAt": "2026-11-01T21:25:19Z" }, "replies": { "sampled": 25, "unanswered": 6, "medianDays": 0.7 } }, "updatedAt": "2026-11-08T00:55:55.450315568Z" } }, "edges": [ { "by": 43, "category": "transparency", "leads": "open-meteo", "name": "Transparency \u0026 trust", "reasons": { "a": "The repository is MIT (copyright 2026 Meteosource) but holds docs and the registry manifest rather than the server; terms and privacy URLs weren't found (10 of 30). The MCP page says keys aren't stored in full and caches are per key (10 of 30). No deprecation policy (0). Subprocessors not found (5 of 20). 10 + 10 + 0 + 5 = 25.", "b": "Server code under AGPL-3.0 and data under CC BY 4.0 (30). The terms say logs, including IP addresses, are deleted after 90 days, paid accounts keep only aggregated usage after that, and the site sets no cookies or trackers. No DPA found (25 of 30). The terms change 'effective immediately upon posting', and we found no deprecation policy or dated notices (5 of 20). Stripe and Substack are named, the entity is OpenMeteo GmbH in Switzerland, and the pricing page now says servers are located in Europe and North America, though the hosting providers aren't named (15 of 20). Total 75." }, "scores": { "a": 32, "b": 75 } }, { "by": 30, "category": "reliability", "leads": "open-meteo", "name": "Reliability", "reasons": { "a": "status.meteosource.com wasn't reachable (0). No history (5). Daily call quotas per plan, and the README's plans-and-limits section (15). Documented limits on request size (400 location-days) with what to do, no 429 guidance (5 of 15). No SLA found (0). Version 0.1.2, not labelled beta (10). 0 + 5 + 15 + 5 + 0 + 10 = 35.", "b": "StatusCake uptime page at status.open-meteo.com, which loads its monitors in the browser and has no incident write-ups we could find (15 of 20). We couldn't read any incident history on 1 October or 2 November (5). Free limits published as 600 calls a minute, 5,000 an hour, 10,000 a day and 300,000 a month (15). Since 26 October 2026 the repository's rate-limiting guide (docs/api-rate-limiting.md) documents 429 for exhausted free quotas and for more than five queued requests per client, `Retry-After` with a random delay before retrying, `X-RateLimit-*` headers, 403 for an over-quota key, and backoff on 503. Every call is a read-only GET, so retries are safe (15). Paid plans carry a 99.9% uptime target on reserved servers, a target rather than an SLA with remedies (5 of 10). Generally available (10). Total 65." }, "scores": { "a": 35, "b": 65 } }, { "by": 20, "category": "payments", "leads": "open-meteo", "name": "Payments \u0026 pricing", "reasons": { "a": "No machine payment protocol (0). Plan prices with daily call quotas, public (10). Free plan with 400 calls a day, no card (20). A person signs up in a browser for the key (0). 0 + 10 + 20 + 0 = 30.", "b": "No x402, MPP or L402 (0). Plan volumes are on the pricing page (1M, 5M and 50M+ calls a month) but the prices appear only at Stripe checkout (10 of 20). Free for non-commercial use with no account or card (20). An agent can call it with no signup at all (20)." }, "scores": { "a": 30, "b": 50 } }, { "by": 20, "category": "maintenance", "leads": "open-meteo", "name": "Maintenance \u0026 community", "reasons": { "a": "Repository commit and tag v0.1.2 on 26 October 2026 (30). Three tags in 90 days (20). Repository issues not read (0). Official registry entry com.meteosource/weather (15). Small repository with server.json; server source not public (5 of 10). 30 + 20 + 0 + 15 + 5 = 70. Registry presence read from Anchor Terminal's own daily import of the official MCP registry (/api/v1/registry.json, 6 November 2026), not the registry's API.", "b": "Release 1.7.0 on 2026-10-16 (30). Four releases in the last 90 days, 1.5.6 on 1 September, 1.5.7 on 4 September, 1.6.0 on 10 September and 1.7.0 on 16 October (20). 141 commits since 4 August from 20 authors plus Dependabot and Copilot, most by two maintainers. We couldn't read issue response times, because GitHub's pages were refused to us (15 of 25). Official SDK repositories for Python and TypeScript (15). CI test workflow and Dependabot on the main repository (10). Total 90." }, "scores": { "a": 70, "b": 90 } }, { "by": 10, "category": "ergonomics", "leads": "open-meteo", "name": "Agent ergonomics", "reasons": { "a": "Seven tools, about 20 KB (25). Date ranges and location limits on history (12 of 20). Documented error messages with fixes (15 of 20). No annotations on the tools (8 of 20, all reads). Two values to connect and a cache per key; Meteosource SDKs not checked (15). 25 + 12 + 15 + 8 + 15 = 75.", "b": "You name the variables you want with `hourly=`, `daily=` or `current=`, and set `forecast_days`, `past_days` or a date range, so responses are as small as the question (22 of 25). Several coordinates and models in one call, no pagination needed (18 of 20). Errors come back as JSON with `error: true` and a readable `reason` (15 of 20). Read-only GETs with no side effects (15 of 20). Only latitude and longitude are required, and there are official SDKs for Python and TypeScript plus a FlatBuffers SDK repo (15)." }, "scores": { "a": 75, "b": 85 } }, { "by": 5, "category": "schema", "leads": "open-meteo", "name": "Schema \u0026 documentation", "reasons": { "a": "Seven tools read from tools/list with JSON Schema inputs (25). No llms.txt found; the README is Markdown on GitHub (5 of 10). Descriptions say what each returns and which plan it needs (15 of 20). Typed inputs, no enums (10 of 15). A README table of error messages and fixes (10 of 15). Tagged releases v0.1.0 to v0.1.2, no changelog file (7 of 15). 25 + 5 + 15 + 10 + 10 + 7 = 72.", "b": "OpenAPI 3.1 files for nine APIs in the open-meteo repository, last updated 1 November 2026, with enums for every weather variable. Not linked from the docs pages (25). open-meteo.com/llms.txt returns 404, and the docs are an HTML page with a URL builder (0). Descriptions in the spec are one line per API, and the docs explain each variable and model but not when to pick one API over another (12 of 20). Typed parameters with enums and required latitude and longitude, though coordinates are strings so that lists fit (13 of 15). URL builder examples in the docs and a 400 response with `error` and `reason` in the spec (12 of 15). /v1 paths and a release-please CHANGELOG.md (15)." }, "scores": { "a": 72, "b": 77 } } ], "facts": [ { "a": "MCP server", "b": "HTTP API", "name": "Kind" }, { "a": "Meteosource", "b": "Open-Meteo", "name": "Vendor" }, { "a": "https://mcp.meteosource.com/mcp", "b": "https://api.open-meteo.com/v1/forecast", "name": "Hosted endpoint" }, { "a": "Streamable HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "None", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service. The repository's MIT licence covers its docs and manifest", "b": "AGPL-3.0 (code), CC BY 4.0 (data)", "name": "Licence" }, { "a": "7", "b": "none", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "no", "name": "llms.txt" }, { "a": "com.meteosource/weather", "b": "not listed", "name": "MCP registry" }, { "a": "none", "b": "2026-10-16", "name": "Last release" }, { "a": "no document linked", "b": "no date given", "name": "Terms last updated" }, { "a": "no document linked", "b": "no date given", "name": "Privacy policy last updated" }, { "a": "not read yet", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not read yet", "b": "not found in the text", "name": "Terms restrict automated access" }, { "a": "not read yet", "b": "not found in the text", "name": "Terms restrict benchmarking" }, { "a": "not read yet", "b": "not found in the text", "name": "Terms or service can change without notice" }, { "a": "not read yet", "b": "not found in the text", "name": "Arbitration or class-action waiver" }, { "a": "none", "b": "6.2k stars", "name": "Popularity" }, { "a": "none", "b": "4/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Open-Meteo scores 66.7 (B) on agent readiness against Meteosource Weather MCP's 50.9 (D), and leads in 6 of 7 scored categories.", "question": "Which is better for AI agents, Meteosource Weather MCP or Open-Meteo?" }, { "answer": "Meteosource Weather MCP needs an API key. Open-Meteo needs no key.", "question": "Do Meteosource Weather MCP and Open-Meteo need an API key?" }, { "answer": "Yes. Meteosource Weather MCP has a hosted endpoint at https://mcp.meteosource.com/mcp and Open-Meteo at https://api.open-meteo.com/v1/forecast.", "question": "Can an agent call Meteosource Weather MCP and Open-Meteo without installing anything?" }, { "answer": "No open-source release is listed for Meteosource Weather MCP. Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)).", "question": "Are Meteosource Weather MCP and Open-Meteo open source?" } ], "goodFor": [ { "aheadOn": null, "also": null, "goodFor": "Agents that answer weather questions, plan around severe weather or estimate solar and wind output.", "slug": "meteosource-mcp", "watchFor": "Plain API key, no OAuth" }, { "aheadOn": [ "Reliability, 65 against 35", "Schema \u0026 documentation, 77 against 72", "Agent ergonomics, 85 against 75", "Payments \u0026 pricing, 50 against 30", "Maintenance \u0026 community, 90 against 70", "Transparency \u0026 trust, 75 against 32" ], "also": [ "No key needed to call it", "Open source" ], "goodFor": "Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.", "slug": "open-meteo", "watchFor": "Commercial prices appear only at Stripe checkout" } ], "history": { "meteosource-mcp": null, "open-meteo": [ { "causes": [ "product", "evidence" ], "date": "2026-11-02", "delta": 3.3, "from": 63.4, "fromGrade": "B", "to": 66.7, "toGrade": "B" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.1, "from": 63.5, "fromGrade": "B", "to": 63.4, "toGrade": "B" } ] }, "job": { "capability": "data.weather", "name": "Weather data" }, "others": [ { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-meteosource-mcp.json", "title": "AccuWeather Core Weather API + MCP vs Meteosource Weather MCP", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-meteosource-mcp" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-meteosource-mcp.json", "title": "Google Weather API (Maps Platform) vs Meteosource Weather MCP", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-meteosource-mcp" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-meteosource-mcp.json", "title": "Met Office Weather DataHub (Site Specific) vs Meteosource Weather MCP", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-meteosource-mcp" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-meteosource-mcp.json", "title": "meteoblue Weather API vs Meteosource Weather MCP", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-meteosource-mcp" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-meteosource-mcp.json", "title": "Meteomatics Weather API vs Meteosource Weather MCP", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-meteosource-mcp" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-nws-api.json", "title": "Meteosource Weather MCP vs NOAA National Weather Service API (api.weather.gov)", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-nws-api" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-openweather-one-call.json", "title": "Meteosource Weather MCP vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-pirate-weather.json", "title": "Meteosource Weather MCP vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-stormglass.json", "title": "Meteosource Weather MCP vs Stormglass API", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-stormglass" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-tomorrow-io.json", "title": "Meteosource Weather MCP vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-visual-crossing.json", "title": "Meteosource Weather MCP vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-weather-company.json", "title": "Meteosource Weather MCP vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-weatherapi-com.json", "title": "Meteosource Weather MCP vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-weatherbit.json", "title": "Meteosource Weather MCP vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-xweather.json", "title": "Meteosource Weather MCP vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-xweather" }, { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo.json", "title": "AccuWeather Core Weather API + MCP vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo.json", "title": "Google Weather API (Maps Platform) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo.json", "title": "Met Office Weather DataHub (Site Specific) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo.json", "title": "meteoblue Weather API vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.json", "title": "Meteomatics Weather API vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.json", "title": "NOAA National Weather Service API (api.weather.gov) vs Open-Meteo", "url": "https://www.anchorterminal.com/compare/nws-api-vs-open-meteo" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.json", "title": "Open-Meteo vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather.json", "title": "Open-Meteo vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.json", "title": "Open-Meteo vs Stormglass API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-stormglass" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.json", "title": "Open-Meteo vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing.json", "title": "Open-Meteo vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weather-company.json", "title": "Open-Meteo vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com.json", "title": "Open-Meteo vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit.json", "title": "Open-Meteo vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/open-meteo-vs-xweather.json", "title": "Open-Meteo vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-xweather" } ], "panel": null, "scores": [ { "by": 30, "edge": "open-meteo", "key": "reliability", "meteosource-mcp": 35, "name": "Reliability", "open-meteo": 65, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 5, "edge": "open-meteo", "key": "schema", "meteosource-mcp": 72, "name": "Schema \u0026 documentation", "open-meteo": 77, "weight": 13 }, { "by": 10, "edge": "open-meteo", "key": "ergonomics", "meteosource-mcp": 75, "name": "Agent ergonomics", "open-meteo": 85, "weight": 13 }, { "by": 4, "edge": "meteosource-mcp", "key": "security", "meteosource-mcp": 42, "name": "Security \u0026 auth", "open-meteo": 38, "weight": 14 }, { "by": 20, "edge": "open-meteo", "key": "payments", "meteosource-mcp": 30, "name": "Payments \u0026 pricing", "open-meteo": 50, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 20, "edge": "open-meteo", "key": "maintenance", "meteosource-mcp": 70, "name": "Maintenance \u0026 community", "open-meteo": 90, "weight": 7 }, { "by": 43, "edge": "open-meteo", "key": "transparency", "meteosource-mcp": 32, "name": "Transparency \u0026 trust", "open-meteo": 75, "weight": 7 } ], "summary": "Open-Meteo scores 66.7 (B) on agent readiness against Meteosource Weather MCP's 50.9 (D), and leads in 6 of 7 scored categories. Both do weather data.", "tasks": null, "tutorials": [], "verdicts": { "meteosource-mcp": "Meteosource's MCP server is a small, clear weather toolset, seven tools covering forecasts, alerts, air quality, history and renewable production, with error messages that tell the agent what to do. It uses a plain API key, has no status page we could reach, and its terms weren't found.", "open-meteo": "No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-open-meteo", "json": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-open-meteo.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-open-meteo.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-open-meteo.min.md" }, "markdown": "Open-Meteo scores 66.7 (B) on agent readiness against Meteosource Weather MCP's 50.9 (D), and leads in 6 of 7 scored categories. Both do weather data.\n\n- Meteosource Weather MCP: grade D, 50.9/100, rank #1048 of 1510. Markdown https://www.anchorterminal.com/tools/meteosource-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/meteosource-mcp.json\n- Open-Meteo: grade B, 66.7/100, rank #361 of 1510. Markdown https://www.anchorterminal.com/tools/open-meteo.md · JSON https://www.anchorterminal.com/api/v1/tools/open-meteo.json\n- Best weather and climate data APIs for AI agents: https://www.anchorterminal.com/best/weather/index.md\n- All 136 weather comparisons: https://www.anchorterminal.com/compare/weather/index.md\n- Best data provider APIs for AI agents: https://www.anchorterminal.com/best/data-providers/index.md\n- All 57 data comparisons: https://www.anchorterminal.com/compare/data-providers/index.md\n\n## Which one, for what\n\n### Meteosource Weather MCP (D)\n\nGood for: Agents that answer weather questions, plan around severe weather or estimate solar and wind output.\n\nWatch for: Plain API key, no OAuth\n\n### Open-Meteo (B)\n\nGood for: Prototypes, personal agents and non-commercial apps that need forecasts or historical weather with no signup.\n\nAhead on:\n- Reliability, 65 against 35\n- Schema \u0026 documentation, 77 against 72\n- Agent ergonomics, 85 against 75\n- Payments \u0026 pricing, 50 against 30\n- Maintenance \u0026 community, 90 against 70\n- Transparency \u0026 trust, 75 against 32\n\nAlso in its favour:\n- No key needed to call it\n- Open source\n\nWatch for: Commercial prices appear only at Stripe checkout\n\n\n## Why the edge\n\n### Transparency \u0026 trust: Open-Meteo +43\n\n- Meteosource Weather MCP (32): The repository is MIT (copyright 2026 Meteosource) but holds docs and the registry manifest rather than the server; terms and privacy URLs weren't found (10 of 30). The MCP page says keys aren't stored in full and caches are per key (10 of 30). No deprecation policy (0). Subprocessors not found (5 of 20). 10 + 10 + 0 + 5 = 25.\n- Open-Meteo (75): Server code under AGPL-3.0 and data under CC BY 4.0 (30). The terms say logs, including IP addresses, are deleted after 90 days, paid accounts keep only aggregated usage after that, and the site sets no cookies or trackers. No DPA found (25 of 30). The terms change 'effective immediately upon posting', and we found no deprecation policy or dated notices (5 of 20). Stripe and Substack are named, the entity is OpenMeteo GmbH in Switzerland, and the pricing page now says servers are located in Europe and North America, though the hosting providers aren't named (15 of 20). Total 75.\n\n### Reliability: Open-Meteo +30\n\n- Meteosource Weather MCP (35): status.meteosource.com wasn't reachable (0). No history (5). Daily call quotas per plan, and the README's plans-and-limits section (15). Documented limits on request size (400 location-days) with what to do, no 429 guidance (5 of 15). No SLA found (0). Version 0.1.2, not labelled beta (10). 0 + 5 + 15 + 5 + 0 + 10 = 35.\n- Open-Meteo (65): StatusCake uptime page at status.open-meteo.com, which loads its monitors in the browser and has no incident write-ups we could find (15 of 20). We couldn't read any incident history on 1 October or 2 November (5). Free limits published as 600 calls a minute, 5,000 an hour, 10,000 a day and 300,000 a month (15). Since 26 October 2026 the repository's rate-limiting guide (docs/api-rate-limiting.md) documents 429 for exhausted free quotas and for more than five queued requests per client, `Retry-After` with a random delay before retrying, `X-RateLimit-*` headers, 403 for an over-quota key, and backoff on 503. Every call is a read-only GET, so retries are safe (15). Paid plans carry a 99.9% uptime target on reserved servers, a target rather than an SLA with remedies (5 of 10). Generally available (10). Total 65.\n\n### Payments \u0026 pricing: Open-Meteo +20\n\n- Meteosource Weather MCP (30): No machine payment protocol (0). Plan prices with daily call quotas, public (10). Free plan with 400 calls a day, no card (20). A person signs up in a browser for the key (0). 0 + 10 + 20 + 0 = 30.\n- Open-Meteo (50): No x402, MPP or L402 (0). Plan volumes are on the pricing page (1M, 5M and 50M+ calls a month) but the prices appear only at Stripe checkout (10 of 20). Free for non-commercial use with no account or card (20). An agent can call it with no signup at all (20).\n\n### Maintenance \u0026 community: Open-Meteo +20\n\n- Meteosource Weather MCP (70): Repository commit and tag v0.1.2 on 26 October 2026 (30). Three tags in 90 days (20). Repository issues not read (0). Official registry entry com.meteosource/weather (15). Small repository with server.json; server source not public (5 of 10). 30 + 20 + 0 + 15 + 5 = 70. Registry presence read from Anchor Terminal's own daily import of the official MCP registry (/api/v1/registry.json, 6 November 2026), not the registry's API.\n- Open-Meteo (90): Release 1.7.0 on 2026-10-16 (30). Four releases in the last 90 days, 1.5.6 on 1 September, 1.5.7 on 4 September, 1.6.0 on 10 September and 1.7.0 on 16 October (20). 141 commits since 4 August from 20 authors plus Dependabot and Copilot, most by two maintainers. We couldn't read issue response times, because GitHub's pages were refused to us (15 of 25). Official SDK repositories for Python and TypeScript (15). CI test workflow and Dependabot on the main repository (10). Total 90.\n\n### Agent ergonomics: Open-Meteo +10\n\n- Meteosource Weather MCP (75): Seven tools, about 20 KB (25). Date ranges and location limits on history (12 of 20). Documented error messages with fixes (15 of 20). No annotations on the tools (8 of 20, all reads). Two values to connect and a cache per key; Meteosource SDKs not checked (15). 25 + 12 + 15 + 8 + 15 = 75.\n- Open-Meteo (85): You name the variables you want with `hourly=`, `daily=` or `current=`, and set `forecast_days`, `past_days` or a date range, so responses are as small as the question (22 of 25). Several coordinates and models in one call, no pagination needed (18 of 20). Errors come back as JSON with `error: true` and a readable `reason` (15 of 20). Read-only GETs with no side effects (15 of 20). Only latitude and longitude are required, and there are official SDKs for Python and TypeScript plus a FlatBuffers SDK repo (15).\n\n### Schema \u0026 documentation: Open-Meteo +5\n\n- Meteosource Weather MCP (72): Seven tools read from tools/list with JSON Schema inputs (25). No llms.txt found; the README is Markdown on GitHub (5 of 10). Descriptions say what each returns and which plan it needs (15 of 20). Typed inputs, no enums (10 of 15). A README table of error messages and fixes (10 of 15). Tagged releases v0.1.0 to v0.1.2, no changelog file (7 of 15). 25 + 5 + 15 + 10 + 10 + 7 = 72.\n- Open-Meteo (77): OpenAPI 3.1 files for nine APIs in the open-meteo repository, last updated 1 November 2026, with enums for every weather variable. Not linked from the docs pages (25). open-meteo.com/llms.txt returns 404, and the docs are an HTML page with a URL builder (0). Descriptions in the spec are one line per API, and the docs explain each variable and model but not when to pick one API over another (12 of 20). Typed parameters with enums and required latitude and longitude, though coordinates are strings so that lists fit (13 of 15). URL builder examples in the docs and a 400 response with `error` and `reason` in the spec (12 of 15). /v1 paths and a release-please CHANGELOG.md (15).\n\n## Score by category\n\n| Category | Weight | Meteosource Weather MCP | Open-Meteo | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 35 | 65 | Open-Meteo +30 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 72 | 77 | Open-Meteo +5 |\n| Agent ergonomics | 13% (16.2 this run) | 75 | 85 | Open-Meteo +10 |\n| Security \u0026 auth | 14% (17.5 this run) | 42 | 38 | Meteosource Weather MCP +4 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 30 | 50 | Open-Meteo +20 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 70 | 90 | Open-Meteo +20 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 32 | 75 | Open-Meteo +43 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **50.9 · D** | **66.7 · B** | |\n\n## Facts side by side\n\n| Fact | Meteosource Weather MCP | Open-Meteo |\n| --- | --- | --- |\n| Kind | MCP server | HTTP API |\n| Vendor | Meteosource | Open-Meteo |\n| Hosted endpoint | `https://mcp.meteosource.com/mcp` | `https://api.open-meteo.com/v1/forecast` |\n| Transports | Streamable HTTP | HTTP |\n| Auth | API key | None |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | Proprietary service. The repository's MIT licence covers its docs and manifest | AGPL-3.0 (code), CC BY 4.0 (data) |\n| Tools exposed | 7 | none |\n| Read-only variant documented | no | no |\n| llms.txt | no | no |\n| MCP registry | `com.meteosource/weather` | not listed |\n| Last release | none | 2026-10-16 |\n| Terms last updated | no document linked | no date given |\n| Privacy policy last updated | no document linked | no date given |\n| Customer content may train models | not read yet | not found in the text |\n| Terms restrict automated access | not read yet | not found in the text |\n| Terms restrict benchmarking | not read yet | not found in the text |\n| Terms or service can change without notice | not read yet | not found in the text |\n| Arbitration or class-action waiver | not read yet | not found in the text |\n| Popularity | none | 6.2k stars |\n| Agent reviews | none | 4/5 (2) |\n\n## How the scores have moved\n\n### Meteosource Weather MCP\n\nNo score change since it was listed.\n\n### Open-Meteo\n\n- +3.3 on 2 November 2026: product, new evidence\n- -0.1 on 8 October 2026: checklist\n\n## Verdicts\n\n**Meteosource Weather MCP.** Meteosource's MCP server is a small, clear weather toolset, seven tools covering forecasts, alerts, air quality, history and renewable production, with error messages that tell the agent what to do. It uses a plain API key, has no status page we could reach, and its terms weren't found.\n\n**Open-Meteo.** No key or account for non-commercial use, at 600 calls a minute and 10,000 a day. Commercial prices appear only at Stripe checkout.\n\n## Before you call either\n\n### Meteosource Weather MCP\n\n1. Call search_places first to resolve a location\n2. Split history requests over 400 location-days into shorter ranges\n3. Production tools need the Renewables plan; check which tools the key exposes\n4. Send the key in a header, never in a URL\n\n### Open-Meteo\n\n1. Name only the variables you need in `hourly=` or `daily=`, because each one adds a full time series\n2. Credit 'Weather data by Open-Meteo.com' wherever you show the data\n3. Use customer-api.open-meteo.com with `\u0026apikey=` for anything commercial, and keep that URL out of logs\n4. Read `reason` on a 400. It names the bad parameter\n5. Cache by coordinate and model run, since global models update about every six hours\n\n## Questions\n\n### Which is better for AI agents, Meteosource Weather MCP or Open-Meteo?\n\nOpen-Meteo scores 66.7 (B) on agent readiness against Meteosource Weather MCP's 50.9 (D), and leads in 6 of 7 scored categories.\n\n### Do Meteosource Weather MCP and Open-Meteo need an API key?\n\nMeteosource Weather MCP needs an API key. Open-Meteo needs no key.\n\n### Can an agent call Meteosource Weather MCP and Open-Meteo without installing anything?\n\nYes. Meteosource Weather MCP has a hosted endpoint at https://mcp.meteosource.com/mcp and Open-Meteo at https://api.open-meteo.com/v1/forecast.\n\n### Are Meteosource Weather MCP and Open-Meteo open source?\n\nNo open-source release is listed for Meteosource Weather MCP. Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)).\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/meteosource-mcp-vs-open-meteo.json, and with the fewest tokens: https://www.anchorterminal.com/compare/meteosource-mcp-vs-open-meteo.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"meteosource-mcp\", \"b\": \"open-meteo\"}`. From a terminal: `anchor compare meteosource-mcp open-meteo`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/meteosource-mcp.json and https://www.anchorterminal.com/api/v1/tools/open-meteo.json\n\n## Other comparisons with Meteosource Weather MCP or Open-Meteo\n\n- [AccuWeather Core Weather API + MCP vs Meteosource Weather MCP](https://www.anchorterminal.com/compare/accuweather-api-vs-meteosource-mcp.md)\n- [Google Weather API (Maps Platform) vs Meteosource Weather MCP](https://www.anchorterminal.com/compare/google-weather-api-vs-meteosource-mcp.md)\n- [Met Office Weather DataHub (Site Specific) vs Meteosource Weather MCP](https://www.anchorterminal.com/compare/met-office-datahub-vs-meteosource-mcp.md)\n- [meteoblue Weather API vs Meteosource Weather MCP](https://www.anchorterminal.com/compare/meteoblue-vs-meteosource-mcp.md)\n- [Meteomatics Weather API vs Meteosource Weather MCP](https://www.anchorterminal.com/compare/meteomatics-vs-meteosource-mcp.md)\n- [Meteosource Weather MCP vs NOAA National Weather Service API (api.weather.gov)](https://www.anchorterminal.com/compare/meteosource-mcp-vs-nws-api.md)\n- [Meteosource Weather MCP vs OpenWeather One Call API](https://www.anchorterminal.com/compare/meteosource-mcp-vs-openweather-one-call.md)\n- [Meteosource Weather MCP vs Pirate Weather](https://www.anchorterminal.com/compare/meteosource-mcp-vs-pirate-weather.md)\n- [Meteosource Weather MCP vs Stormglass API](https://www.anchorterminal.com/compare/meteosource-mcp-vs-stormglass.md)\n- [Meteosource Weather MCP vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/meteosource-mcp-vs-tomorrow-io.md)\n- [Meteosource Weather MCP vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/meteosource-mcp-vs-visual-crossing.md)\n- [Meteosource Weather MCP vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/meteosource-mcp-vs-weather-company.md)\n- [Meteosource Weather MCP vs WeatherAPI.com](https://www.anchorterminal.com/compare/meteosource-mcp-vs-weatherapi-com.md)\n- [Meteosource Weather MCP vs Weatherbit API](https://www.anchorterminal.com/compare/meteosource-mcp-vs-weatherbit.md)\n- [Meteosource Weather MCP vs Xweather Weather API](https://www.anchorterminal.com/compare/meteosource-mcp-vs-xweather.md)\n- [AccuWeather Core Weather API + MCP vs Open-Meteo](https://www.anchorterminal.com/compare/accuweather-api-vs-open-meteo.md)\n- [Google Weather API (Maps Platform) vs Open-Meteo](https://www.anchorterminal.com/compare/google-weather-api-vs-open-meteo.md)\n- [Met Office Weather DataHub (Site Specific) vs Open-Meteo](https://www.anchorterminal.com/compare/met-office-datahub-vs-open-meteo.md)\n- [meteoblue Weather API vs Open-Meteo](https://www.anchorterminal.com/compare/meteoblue-vs-open-meteo.md)\n- [Meteomatics Weather API vs Open-Meteo](https://www.anchorterminal.com/compare/meteomatics-vs-open-meteo.md)\n- [NOAA National Weather Service API (api.weather.gov) vs Open-Meteo](https://www.anchorterminal.com/compare/nws-api-vs-open-meteo.md)\n- [Open-Meteo vs OpenWeather One Call API](https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.md)\n- [Open-Meteo vs Pirate Weather](https://www.anchorterminal.com/compare/open-meteo-vs-pirate-weather.md)\n- [Open-Meteo vs Stormglass API](https://www.anchorterminal.com/compare/open-meteo-vs-stormglass.md)\n- [Open-Meteo vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-tomorrow-io.md)\n- [Open-Meteo vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-visual-crossing.md)\n- [Open-Meteo vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/open-meteo-vs-weather-company.md)\n- [Open-Meteo vs WeatherAPI.com](https://www.anchorterminal.com/compare/open-meteo-vs-weatherapi-com.md)\n- [Open-Meteo vs Weatherbit API](https://www.anchorterminal.com/compare/open-meteo-vs-weatherbit.md)\n- [Open-Meteo vs Xweather Weather API](https://www.anchorterminal.com/compare/open-meteo-vs-xweather.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-08", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Meteosource Weather MCP vs Open-Meteo", "url": "" } ], "description": "Open-Meteo scores 66.7 (B) to Meteosource Weather MCP's 50.9 (D) for weather data. Prices, MCP, x402, uptime and agent notes side by side.", "facts": [ "Meteosource Weather MCP D 50.9", "Open-Meteo B 66.7", "scores" ], "h1": "Meteosource Weather MCP vs Open-Meteo", "image": "https://www.anchorterminal.com/assets/og/default.png", "path": "/compare/meteosource-mcp-vs-open-meteo", "published": "2026-10-01", "section": "tools", "title": "Meteosource Weather MCP vs Open-Meteo for AI agents (2026)", "toc": null, "updated": "2026-11-07", "url": "https://www.anchorterminal.com/compare/meteosource-mcp-vs-open-meteo" }, "tokens": { "markdown": 4200, "slim": 2180 }, "version": 1 }