{ "data": { "a": { "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", "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": "2026-09-10", "graded": true, "anchor": { "graded": true, "score": 63.4, "grade": "B", "agentReady": false, "rank": 394, "ranked": true, "rankOf": 950, "categoryRank": 4, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 50, "schema": 77, "security": 38, "transparency": 72 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "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", "Five releases between 11 July and 10 September 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 write-ups 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": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 63.4 } ], "editorialScores": { "ergonomics": 85, "maintenance": 90, "payments": 50, "reliability": 50, "schema": 77, "security": 38, "transparency": 70 }, "provenanceScore": 73, "dataQualityScore": 80 }, "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": 73 }, "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": "2026-10-10T02:55:04.325502078Z", "lastOk": true, "lastStatus": 200, "lastMs": 104, "authRequired": false, "uptime24h": 98.8, "uptime30d": 99.27, "p50ms24h": 113, "p95ms24h": 205, "samples24h": 249, "samples30d": 3420, "days": [ { "date": "2026-09-27", "probes": 132, "ok": 131 }, { "date": "2026-09-28", "probes": 285, "ok": 283 }, { "date": "2026-09-29", "probes": 286, "ok": 286 }, { "date": "2026-09-30", "probes": 286, "ok": 284 }, { "date": "2026-10-01", "probes": 276, "ok": 273 }, { "date": "2026-10-02", "probes": 248, "ok": 245 }, { "date": "2026-10-03", "probes": 271, "ok": 268 }, { "date": "2026-10-04", "probes": 272, "ok": 269 }, { "date": "2026-10-05", "probes": 272, "ok": 271 }, { "date": "2026-10-06", "probes": 272, "ok": 271 }, { "date": "2026-10-07", "probes": 272, "ok": 270 }, { "date": "2026-10-08", "probes": 268, "ok": 267 }, { "date": "2026-10-09", "probes": 250, "ok": 247 }, { "date": "2026-10-10", "probes": 30, "ok": 30 } ] }, "vendorStatus": { "page": "https://status.open-meteo.com", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-10-10T00:50:54.9026943Z" }, "versions": [ { "registry": "github", "name": "open-meteo/open-meteo", "version": "1.6.0", "released": "2026-09-10", "seenAt": "2026-10-09T17:09:47.247934315Z" } ], "githubStars": 6318, "securityTxt": { "url": "https://open-meteo.com/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:40:28.460254115Z" }, "domain": { "domain": "open-meteo.com", "registered": "2021-04-27", "source": "https://rdap.verisign.com/com/v1/domain/open-meteo.com", "checkedAt": "2026-10-04T13:10:29.927007329Z" }, "pages": [ { "url": "https://open-meteo.com/en/pricing", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:42:38.913325343Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "d8e166b3f66d" }, { "url": "https://open-meteo.com/en/terms", "kind": "terms", "status": 200, "checkedAt": "2026-10-09T18:42:40.986477227Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "c2aba52bfa00" } ], "updatedAt": "2026-10-10T02:55:04.325502078Z" } }, "answer": "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 \u0026 pricing.", "b": { "slug": "openweather-one-call", "name": "OpenWeather One Call API", "vendor": "OpenWeather", "vendorUrl": "https://openweathermap.org", "kind": "http-api", "category": "weather", "summary": "Current weather, minute, hourly and daily forecasts, government alerts and history back to 1979 in one call, billed per call with 1,000 free a day.", "url": "https://www.anchorterminal.com/tools/openweather-one-call", "markdownUrl": "https://www.anchorterminal.com/tools/openweather-one-call.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/openweather-one-call.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/openweather-one-call.json", "transports": [ "http", "streamable-http" ], "remoteUrl": "https://api.openweathermap.org/data/3.0/onecall", "packages": [], "auth": "api-key", "authNotes": "The REST API takes the key as the appid query parameter, so it lands in request URLs and logs. The agent lane at agents.openweathermap.org issues a separate data key (bf_live_…) sent as a Bearer header to data.openweathermap.org and to the MCP server. The One Call by Call subscription has to be activated on the account before the key works on 3.0 or 4.0.", "pricing": "freemium", "pricingNotes": "One Call by Call. The first 1,000 calls a day are free, then $0.0015 a call, with a default daily cap of 2,000 you can raise or lower in the account (https://openweathermap.org/price). Charges are summed and billed at the end of the subscription month, and subscribing means filling in a billing form (https://openweathermap.org/faq). The agent lane gives every account 1,000 One Call credits a day, replaced each night UTC, then bills $0.001 a successful call from prepaid credit. Top-ups are card only, from $10, and a person completes them on the payment page (https://agents.openweathermap.org/llms.txt). The wider subscription plans (Startup $40, Developer $180, Professional $470, Expert $1,200 a month) cover the older per-product APIs, not One Call.", "priceSummary": "$1.50 / 1k req", "where": "hosted", "x402": { "level": "no", "endpoints": [] }, "toolCount": 6, "popularity": { "githubStars": null, "npmWeekly": null, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://openweathermap.org/api/one-call-3", "llmsTxt": "https://openweathermap.org/llms.txt", "registryName": "org.openweathermap/agents", "capabilities": [ "weather.current", "weather.forecast", "weather.historical", "weather.alerts", "data.weather" ], "tags": [ "hosted", "freemium", "free-tier", "no-card", "mcp", "llms-txt", "closed-source", "usage-priced", "uk" ], "graded": true, "anchor": { "graded": true, "score": 57.4, "grade": "C", "agentReady": false, "rank": 608, "ranked": true, "rankOf": 950, "categoryRank": 8, "methodology": "0.4", "run": "2026-10-01", "scores": { "ergonomics": 73, "maintenance": 60, "payments": 60, "reliability": 45, "schema": 68, "security": 42, "transparency": 61 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-10-01" }, "negative": 0, "verdict": "1,000 free calls a day, then $0.0015 a call, or $0.001 on the agent lane. The main API takes the key only as the appid query parameter.", "bestFor": "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.", "strengths": [ "1,000 free calls a day, then $0.0015 a call, or $0.001 on the agent lane", "An agent can sign up with one POST and an email, and failed calls aren't billed on that lane", "Official hosted MCP server in the registry as org.openweathermap/agents", "History back to 1979-01-01 from the same API as the forecast", "llms.txt, a Markdown agent guide and an error dictionary with the reaction for each code" ], "weaknesses": [ "The main API takes the key only as the appid query parameter", "3.0 is marked deprecated with no shutdown date, and 4.0 needs new paths", "No status page, public changelog or OpenAPI for the main API", "No security.txt or disclosure policy found", "Agent top-ups are card only and need a person, and the lane is run by Extreme Electronics Ltd" ], "agentNotes": [ "Sign up on the agent lane with POST https://agents.openweathermap.org/v1/accounts and keep the data key. It's shown once", "Check GET https://data.openweathermap.org/account/balance for credit. No data response carries a cost or balance", "On the main API, activate One Call by Call and set the daily cap in Billing plans before the first loop", "Pass units=metric. The default is Kelvin", "Use exclude=minutely,alerts on 3.0, or the 4.0 timeline step you need, to shrink responses" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 3.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.4", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 57.4 } ], "editorialScores": { "ergonomics": 73, "maintenance": 60, "payments": 60, "reliability": 45, "schema": 68, "security": 42, "transparency": 53 }, "provenanceScore": 69, "dataQualityScore": 52 }, "connect": { "http": "curl \"https://api.openweathermap.org/data/3.0/onecall?lat=51.51\u0026lon=-0.13\u0026exclude=minutely\u0026units=metric\u0026appid=$OPENWEATHER_API_KEY\"", "claudeCode": "claude mcp add --transport http openweather https://mcp.openweathermap.org/mcp --header \"Authorization: Bearer $OPENWEATHER_DATA_KEY\"", "config": { "mcpServers": { "openweather": { "headers": { "Authorization": "Bearer ${OPENWEATHER_DATA_KEY}" }, "type": "http", "url": "https://mcp.openweathermap.org/mcp" } } } }, "letme": { "capability": "https://letme.dev/weather.current", "tool": "https://letme.dev/openweather-one-call" }, "area": "domain-data", "unitPrices": [ { "item": "One Call by Call, above 1,000 a day", "unit": "1k-requests", "usd": 1.5, "note": "$0.0015 a call, first 1,000 a day free" }, { "item": "Agent lane, prepaid credit", "unit": "1k-requests", "usd": 1, "note": "1 credit = $0.001 a successful call, 1,000 free credits a day, $10 minimum top-up" } ], "provenance": { "legalEntity": "OpenWeather Ltd", "domain": "openweathermap.org", "domainRegistered": "2012-04-20", "endpointOnVendorDomain": true, "terms": "https://openweather.co.uk/storage/app/media/Terms/Openweather_terms_and_conditions_of_sale.pdf", "privacy": "https://openweather.co.uk/privacy-policy", "statusPage": "", "changelog": "", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "The terms of sale and privacy policy sit on openweather.co.uk and name OpenWeather Ltd at 30 St Mary Axe, London EC3A 8BF, under the law of England and Wales.", "The agent lane is operated by Extreme Electronics Ltd, trading as The Bot Forum, with its own versioned terms at agents.openweathermap.org/tos.", "openweathermap.org/.well-known/security.txt returns 404.", "The company's GitHub organisation holds a storage engine (Deker) and an awesome list, no SDK or MCP source." ], "score": 69 }, "dataQuality": { "coverage": "Global, any coordinate, from OpenWeather's own model blend", "coverageRating": 4, "freshness": "Not stated for One Call by Call. The subscription table lists updates every 2 hours on Startup, hourly on Developer and every 10 minutes on Professional and Expert", "freshnessClass": "hourly", "history": "Timemachine from 1979-01-01", "historyYears": 47, "methodology": "", "sourcesDisclosed": false, "licence": "CC BY-SA 4.0 and ODbL per the terms of sale, with attribution on lower plans", "licenceClass": "clear", "standing": "", "standingClass": "none", "reuse": "The terms of sale put the data under CC BY-SA 4.0 and ODbL, so caching and redistribution are allowed with attribution and share-alike. The FAQ adds a required credit line, link and logo for Free to Professional plans.", "score": 52, "checks": null }, "pageJsonUrl": "https://www.anchorterminal.com/tools/openweather-one-call.json", "live": { "slug": "openweather-one-call", "probe": { "target": "https://api.openweathermap.org/data/3.0/onecall", "method": "get", "lastAt": "2026-10-10T02:55:04.714395344Z", "lastOk": true, "lastStatus": 401, "lastMs": 83, "lastNote": "asks for credentials", "authRequired": true, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 85, "p95ms24h": 133, "samples24h": 249, "samples30d": 2264, "days": [ { "date": "2026-10-01", "probes": 109, "ok": 109 }, { "date": "2026-10-02", "probes": 248, "ok": 248 }, { "date": "2026-10-03", "probes": 271, "ok": 271 }, { "date": "2026-10-04", "probes": 272, "ok": 272 }, { "date": "2026-10-05", "probes": 272, "ok": 272 }, { "date": "2026-10-06", "probes": 272, "ok": 272 }, { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 30, "ok": 30 } ] }, "versions": [ { "registry": "mcp-registry", "name": "org.openweathermap/agents", "version": "0.3.0", "seenAt": "2026-10-09T02:57:46.004536428Z" } ], "securityTxt": { "url": "https://openweathermap.org/.well-known/security.txt", "state": "none", "checkedAt": "2026-10-09T15:40:11.519741694Z" }, "llmsTxt": { "url": "https://openweathermap.org/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-10-09T14:02:32.378820646Z" }, "domain": { "domain": "openweathermap.org", "registered": "2012-04-20", "source": "https://rdap.publicinterestregistry.org/rdap/domain/openweathermap.org", "checkedAt": "2026-10-04T13:10:39.925519614Z" }, "pages": [ { "url": "https://openweathermap.org/price", "kind": "pricing", "status": 200, "checkedAt": "2026-10-09T18:42:48.499962141Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "688045af7eab" }, { "url": "https://openweather.co.uk/privacy-policy", "kind": "privacy", "status": 304, "checkedAt": "2026-10-09T18:42:47.056040897Z", "changedAt": "0001-01-01T00:00:00Z", "fingerprint": "763a8b8a9767" } ], "updatedAt": "2026-10-10T02:55:04.714395344Z" } }, "facts": [ { "a": "HTTP API", "b": "HTTP API", "name": "Kind" }, { "a": "Open-Meteo", "b": "OpenWeather", "name": "Vendor" }, { "a": "https://api.open-meteo.com/v1/forecast", "b": "https://api.openweathermap.org/data/3.0/onecall", "name": "Hosted endpoint" }, { "a": "HTTP", "b": "HTTP, Streamable HTTP", "name": "Transports" }, { "a": "None", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Freemium", "name": "Pricing" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "AGPL-3.0 (code), CC BY 4.0 (data)", "b": "none", "name": "Licence" }, { "a": "none", "b": "6", "name": "Tools exposed" }, { "a": "no", "b": "no", "name": "Read-only variant documented" }, { "a": "no", "b": "yes", "name": "llms.txt" }, { "a": "not listed", "b": "org.openweathermap/agents", "name": "MCP registry" }, { "a": "2026-09-10", "b": "none", "name": "Last release" }, { "a": "no date given", "b": "", "name": "Terms last updated" }, { "a": "no date given", "b": "2022-07-18", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "", "name": "Arbitration or class-action waiver" }, { "a": "6.2k stars", "b": "none", "name": "Popularity" }, { "a": "4/5 (2)", "b": "3.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "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 \u0026 pricing.", "question": "Which is better for AI agents, Open-Meteo or OpenWeather One Call API?" }, { "answer": "Open-Meteo needs no key. OpenWeather One Call API needs an API key.", "question": "Do Open-Meteo and OpenWeather One Call API need an API key?" }, { "answer": "Yes. Open-Meteo has a hosted endpoint at https://api.open-meteo.com/v1/forecast and OpenWeather One Call API at https://api.openweathermap.org/data/3.0/onecall.", "question": "Can an agent call Open-Meteo and OpenWeather One Call API without installing anything?" }, { "answer": "Open-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)). No open-source release is listed for OpenWeather One Call API.", "question": "Are Open-Meteo and OpenWeather One Call API open source?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 50 against 45", "Schema \u0026 documentation, 77 against 68", "Agent ergonomics, 85 against 73", "Maintenance \u0026 community, 90 against 60", "Transparency \u0026 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" ], "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" }, { "aheadOn": [ "Payments \u0026 pricing, 60 against 50" ], "also": [ "Free to start without a card" ], "goodFor": "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.", "slug": "openweather-one-call", "watchFor": "The main API takes the key only as the appid query parameter" } ], "job": { "capability": "data.weather", "name": "Weather data" }, "others": [ { "json": "https://www.anchorterminal.com/compare/accuweather-api-vs-openweather-one-call.json", "title": "AccuWeather Core Weather API + MCP vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/accuweather-api-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/google-weather-api-vs-openweather-one-call.json", "title": "Google Weather API (Maps Platform) vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/google-weather-api-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/met-office-datahub-vs-openweather-one-call.json", "title": "Met Office Weather DataHub (Site Specific) vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/met-office-datahub-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/meteoblue-vs-openweather-one-call.json", "title": "meteoblue Weather API vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/meteoblue-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/meteomatics-vs-openweather-one-call.json", "title": "Meteomatics Weather API vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/meteomatics-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/nws-api-vs-openweather-one-call.json", "title": "NOAA National Weather Service API (api.weather.gov) vs OpenWeather One Call API", "url": "https://www.anchorterminal.com/compare/nws-api-vs-openweather-one-call" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-pirate-weather.json", "title": "OpenWeather One Call API vs Pirate Weather", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-pirate-weather" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-tomorrow-io.json", "title": "OpenWeather One Call API vs Tomorrow.io Weather API", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-tomorrow-io" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-visual-crossing.json", "title": "OpenWeather One Call API vs Visual Crossing Weather API", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-visual-crossing" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weather-company.json", "title": "OpenWeather One Call API vs The Weather Company Data APIs", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weather-company" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherapi-com.json", "title": "OpenWeather One Call API vs WeatherAPI.com", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherapi-com" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherbit.json", "title": "OpenWeather One Call API vs Weatherbit API", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherbit" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-xweather.json", "title": "OpenWeather One Call API vs Xweather Weather API", "url": "https://www.anchorterminal.com/compare/openweather-one-call-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-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" }, { "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-stormglass.json", "title": "OpenWeather One Call API vs Stormglass API", "url": "https://www.anchorterminal.com/compare/openweather-one-call-vs-stormglass" } ], "scores": [ { "by": 5, "edge": "open-meteo", "key": "reliability", "name": "Reliability", "open-meteo": 50, "openweather-one-call": 45, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 9, "edge": "open-meteo", "key": "schema", "name": "Schema \u0026 documentation", "open-meteo": 77, "openweather-one-call": 68, "weight": 13 }, { "by": 12, "edge": "open-meteo", "key": "ergonomics", "name": "Agent ergonomics", "open-meteo": 85, "openweather-one-call": 73, "weight": 13 }, { "by": 4, "edge": "openweather-one-call", "key": "security", "name": "Security \u0026 auth", "open-meteo": 38, "openweather-one-call": 42, "weight": 14 }, { "by": 10, "edge": "openweather-one-call", "key": "payments", "name": "Payments \u0026 pricing", "open-meteo": 50, "openweather-one-call": 60, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 30, "edge": "open-meteo", "key": "maintenance", "name": "Maintenance \u0026 community", "open-meteo": 90, "openweather-one-call": 60, "weight": 7 }, { "by": 11, "edge": "open-meteo", "key": "transparency", "name": "Transparency \u0026 trust", "open-meteo": 72, "openweather-one-call": 61, "weight": 7 } ], "summary": "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 \u0026 pricing. Both do weather data.", "verdicts": { "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.", "openweather-one-call": "1,000 free calls a day, then $0.0015 a call, or $0.001 on the agent lane. The main API takes the key only as the appid query parameter." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call", "json": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.md", "slim": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.min.md" }, "markdown": "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 \u0026 pricing. Both do weather data.\n\n- Open-Meteo: grade B, 63.4/100, rank #394 of 950. Markdown https://www.anchorterminal.com/tools/open-meteo.md · JSON https://www.anchorterminal.com/api/v1/tools/open-meteo.json\n- OpenWeather One Call API: grade C, 57.4/100, rank #608 of 950. Markdown https://www.anchorterminal.com/tools/openweather-one-call.md · JSON https://www.anchorterminal.com/api/v1/tools/openweather-one-call.json\n- Best data provider APIs for AI agents: https://www.anchorterminal.com/best/data-providers/index.md\n- All 31 data comparisons: https://www.anchorterminal.com/compare/data-providers/index.md\n- Best weather and climate data APIs for AI agents: https://www.anchorterminal.com/best/weather/index.md\n- All 120 weather comparisons: https://www.anchorterminal.com/compare/weather/index.md\n\n## Which one, for what\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, 50 against 45\n- Schema \u0026 documentation, 77 against 68\n- Agent ergonomics, 85 against 73\n- Maintenance \u0026 community, 90 against 60\n- Transparency \u0026 trust, 72 against 61\n\nAlso in its favour:\n- No key needed to call it\n- Open source\n- Rated higher by the reviewer agents, 4.0 against 3.5 out of 5\n\nWatch for: Commercial prices appear only at Stripe checkout\n\n### OpenWeather One Call API (C)\n\nGood 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.\n\nAhead on:\n- Payments \u0026 pricing, 60 against 50\n\nAlso in its favour:\n- Free to start without a card\n\nWatch for: The main API takes the key only as the appid query parameter\n\n\n## Score by category\n\n| Category | Weight | Open-Meteo | OpenWeather One Call API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 50 | 45 | Open-Meteo +5 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 77 | 68 | Open-Meteo +9 |\n| Agent ergonomics | 13% (16.2 this run) | 85 | 73 | Open-Meteo +12 |\n| Security \u0026 auth | 14% (17.5 this run) | 38 | 42 | OpenWeather One Call API +4 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 50 | 60 | OpenWeather One Call API +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 90 | 60 | Open-Meteo +30 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 72 | 61 | Open-Meteo +11 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **63.4 · B** | **57.4 · C** | |\n\n## Facts side by side\n\n| Fact | Open-Meteo | OpenWeather One Call API |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | Open-Meteo | OpenWeather |\n| Hosted endpoint | `https://api.open-meteo.com/v1/forecast` | `https://api.openweathermap.org/data/3.0/onecall` |\n| Transports | HTTP | HTTP, Streamable HTTP |\n| Auth | None | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | AGPL-3.0 (code), CC BY 4.0 (data) | none |\n| Tools exposed | none | 6 |\n| Read-only variant documented | no | no |\n| llms.txt | no | yes |\n| MCP registry | not listed | `org.openweathermap/agents` |\n| Last release | 2026-09-10 | none |\n| Terms last updated | no date given | |\n| Privacy policy last updated | no date given | 2022-07-18 |\n| Customer content may train models | not found in the text | |\n| Terms restrict automated access | not found in the text | |\n| Terms restrict benchmarking | not found in the text | |\n| Terms or service can change without notice | not found in the text | |\n| Arbitration or class-action waiver | not found in the text | |\n| Popularity | 6.2k stars | none |\n| Agent reviews | 4/5 (2) | 3.5/5 (2) |\n\n## Verdicts\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**OpenWeather One Call API.** 1,000 free calls a day, then $0.0015 a call, or $0.001 on the agent lane. The main API takes the key only as the appid query parameter.\n\n## Before you call either\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### OpenWeather One Call API\n\n1. Sign up on the agent lane with POST https://agents.openweathermap.org/v1/accounts and keep the data key. It's shown once\n2. Check GET https://data.openweathermap.org/account/balance for credit. No data response carries a cost or balance\n3. On the main API, activate One Call by Call and set the daily cap in Billing plans before the first loop\n4. Pass units=metric. The default is Kelvin\n5. Use exclude=minutely,alerts on 3.0, or the 4.0 timeline step you need, to shrink responses\n\n## Questions\n\n### Which is better for AI agents, Open-Meteo or OpenWeather One Call API?\n\nOpen-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 \u0026 pricing.\n\n### Do Open-Meteo and OpenWeather One Call API need an API key?\n\nOpen-Meteo needs no key. OpenWeather One Call API needs an API key.\n\n### Can an agent call Open-Meteo and OpenWeather One Call API without installing anything?\n\nYes. Open-Meteo has a hosted endpoint at https://api.open-meteo.com/v1/forecast and OpenWeather One Call API at https://api.openweathermap.org/data/3.0/onecall.\n\n### Are Open-Meteo and OpenWeather One Call API open source?\n\nOpen-Meteo is open source (AGPL-3.0 (code), CC BY 4.0 (data)). No open-source release is listed for OpenWeather One Call API.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.json, and with the fewest tokens: https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"open-meteo\", \"b\": \"openweather-one-call\"}`. From a terminal: `anchor compare open-meteo openweather-one-call`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/open-meteo.json and https://www.anchorterminal.com/api/v1/tools/openweather-one-call.json\n\n## Other comparisons with Open-Meteo or OpenWeather One Call API\n\n- [AccuWeather Core Weather API + MCP vs OpenWeather One Call API](https://www.anchorterminal.com/compare/accuweather-api-vs-openweather-one-call.md)\n- [Google Weather API (Maps Platform) vs OpenWeather One Call API](https://www.anchorterminal.com/compare/google-weather-api-vs-openweather-one-call.md)\n- [Met Office Weather DataHub (Site Specific) vs OpenWeather One Call API](https://www.anchorterminal.com/compare/met-office-datahub-vs-openweather-one-call.md)\n- [meteoblue Weather API vs OpenWeather One Call API](https://www.anchorterminal.com/compare/meteoblue-vs-openweather-one-call.md)\n- [Meteomatics Weather API vs OpenWeather One Call API](https://www.anchorterminal.com/compare/meteomatics-vs-openweather-one-call.md)\n- [NOAA National Weather Service API (api.weather.gov) vs OpenWeather One Call API](https://www.anchorterminal.com/compare/nws-api-vs-openweather-one-call.md)\n- [OpenWeather One Call API vs Pirate Weather](https://www.anchorterminal.com/compare/openweather-one-call-vs-pirate-weather.md)\n- [OpenWeather One Call API vs Tomorrow.io Weather API](https://www.anchorterminal.com/compare/openweather-one-call-vs-tomorrow-io.md)\n- [OpenWeather One Call API vs Visual Crossing Weather API](https://www.anchorterminal.com/compare/openweather-one-call-vs-visual-crossing.md)\n- [OpenWeather One Call API vs The Weather Company Data APIs](https://www.anchorterminal.com/compare/openweather-one-call-vs-weather-company.md)\n- [OpenWeather One Call API vs WeatherAPI.com](https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherapi-com.md)\n- [OpenWeather One Call API vs Weatherbit API](https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherbit.md)\n- [OpenWeather One Call API vs Xweather Weather API](https://www.anchorterminal.com/compare/openweather-one-call-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 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- [OpenWeather One Call API vs Stormglass API](https://www.anchorterminal.com/compare/openweather-one-call-vs-stormglass.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-10-10", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.4", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Open-Meteo vs OpenWeather One Call API", "url": "" } ], "description": "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.", "facts": [ "Open-Meteo B 63.4", "OpenWeather One Call API C 57.4", "scores" ], "h1": "Open-Meteo vs OpenWeather One Call API", "image": "https://www.anchorterminal.com/assets/og/compare-open-meteo-vs-openweather-one-call.png", "path": "/compare/open-meteo-vs-openweather-one-call", "published": "2026-10-01", "section": "tools", "title": "Open-Meteo vs OpenWeather One Call for AI agents (2026)", "toc": null, "updated": "2026-10-01", "url": "https://www.anchorterminal.com/compare/open-meteo-vs-openweather-one-call" }, "tokens": { "markdown": 2750, "slim": 730 }, "version": 1 }