{
  "data": {
    "a": {
      "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": 294,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 5,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 73,
          "maintenance": 60,
          "payments": 60,
          "reliability": 45,
          "schema": 68,
          "security": 42,
          "transparency": 62
        },
        "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.",
        "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": "0.3",
            "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": 70,
        "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": 70
      },
      "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": "2026-10-04T23:32:51.837006704Z",
          "lastOk": true,
          "lastStatus": 401,
          "lastMs": 86,
          "lastNote": "asks for credentials",
          "authRequired": true,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 86,
          "p95ms24h": 121,
          "samples24h": 272,
          "samples30d": 895,
          "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": 267,
              "ok": 267
            }
          ]
        },
        "versions": [
          {
            "registry": "mcp-registry",
            "name": "org.openweathermap/agents",
            "version": "0.3.0",
            "seenAt": "2026-10-03T23:29:28.630222764Z"
          }
        ],
        "securityTxt": {
          "url": "https://openweathermap.org/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:16:02.706673842Z"
        },
        "llmsTxt": {
          "url": "https://openweathermap.org/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:05.491726758Z"
        },
        "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": "2026-10-04T15:46:31.298624589Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "688045af7eab"
          },
          {
            "url": "https://openweather.co.uk/privacy-policy",
            "kind": "privacy",
            "status": 304,
            "checkedAt": "2026-10-04T15:46:29.285242667Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "763a8b8a9767"
          }
        ],
        "updatedAt": "2026-10-04T23:32:51.837006704Z"
      }
    },
    "b": {
      "slug": "weatherapi-com",
      "name": "WeatherAPI.com",
      "vendor": "WeatherAPI.com (Zoomash Ltd)",
      "vendorUrl": "https://www.weatherapi.com",
      "kind": "http-api",
      "category": "weather",
      "summary": "Weather API for current conditions, forecasts, history, marine data, alerts and air quality, queried by location.",
      "url": "https://www.anchorterminal.com/tools/weatherapi-com",
      "markdownUrl": "https://www.anchorterminal.com/tools/weatherapi-com.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/weatherapi-com.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/weatherapi-com.json",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://api.weatherapi.com/v1",
      "packages": [],
      "auth": "api-key",
      "authNotes": "The key goes in the key query parameter on every request. The terms tie one key to one application.",
      "pricing": "freemium",
      "pricingNotes": "Free at 100,000 calls a month with a 3-day forecast and 1 day of history, no card. Starter $7 a month ($75 a year) for 3 million calls, 7-day forecast and 7 days of history. Pro+ $25 ($270 a year) for 5 million calls, 14-day forecast, 365 days of history, marine with tides and bulk requests. Business $65 ($702 a year) for 10 million calls, history back to 2010-01-01 and 99.9 per cent uptime. Enterprise on request with unlimited calls. Paid plans start with a 14-day free trial (https://www.weatherapi.com/pricing.aspx).",
      "priceSummary": "$7 / mo",
      "where": "hosted",
      "x402": {
        "level": "no",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-09-30"
      },
      "docsUrl": "https://www.weatherapi.com/docs/",
      "llmsTxt": "https://www.weatherapi.com/llms.txt",
      "openapi": "https://www.weatherapi.com/openapi.json",
      "capabilities": [
        "weather.current",
        "weather.forecast",
        "weather.historical",
        "weather.alerts",
        "weather.marine",
        "data.weather"
      ],
      "tags": [
        "hosted",
        "freemium",
        "free-tier",
        "no-card",
        "closed-source",
        "uk"
      ],
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 65.8,
        "grade": "B",
        "agentReady": false,
        "rank": 169,
        "ranked": true,
        "rankOf": 452,
        "categoryRank": 3,
        "methodology": "0.3",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 80,
          "maintenance": 45,
          "payments": 30,
          "reliability": 90,
          "schema": 89,
          "security": 37,
          "transparency": 70
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-01"
        },
        "negative": 0,
        "verdict": "3 million calls for $7 a month, and 100,000 a month free with no card. Key only in the query string, and no security.txt.",
        "strengths": [
          "3 million calls for $7 a month, and 100,000 a month free with no card",
          "OpenAPI 3.1 spec with structured errors, plus llms.txt",
          "Field filters (current_fields, day_fields, hour_fields) to trim responses",
          "Status page with no incidents listed, and 99.9 per cent with service credits for High Volume customers",
          "12 months' written notice before an API deprecation, in the terms"
        ],
        "weaknesses": [
          "Key only in the query string, and no security.txt",
          "Privacy policy undated, with template placeholders and transfers to Russia and China",
          "SDKs for Node.js, Java, PHP and Go untouched since 2020 and 2021",
          "No full list of data sources or models",
          "Caching limited to 60 minutes for current and 24 hours for forecast"
        ],
        "agentNotes": [
          "Pass current_fields, day_fields or hour_fields to cut the response to what you need",
          "Treat a 403 with error code 2007 as the monthly quota, not a bad key. There's no 429",
          "Reuse the id from search.json (q=id:NNN) to avoid ambiguous city names",
          "Cache history freely, current for under an hour and forecasts for under a day, to stay inside the terms",
          "Use https://api.weatherapi.com/v1. The docs still show an http:// base URL"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 2,
        "avgRating": 3.5,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "B",
            "methodology": "0.3",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 65.8
          }
        ],
        "editorialScores": {
          "ergonomics": 80,
          "maintenance": 45,
          "payments": 30,
          "reliability": 90,
          "schema": 89,
          "security": 37,
          "transparency": 49
        },
        "provenanceScore": 90,
        "dataQualityScore": 49
      },
      "connect": {
        "http": "curl \"https://api.weatherapi.com/v1/forecast.json?key=$WEATHERAPI_KEY\u0026q=51.51,-0.13\u0026days=3\u0026aqi=no\u0026alerts=no\""
      },
      "letme": {
        "capability": "https://letme.dev/weather.current",
        "tool": "https://letme.dev/weatherapi-com"
      },
      "area": "domain-data",
      "unitPrices": [
        {
          "item": "Starter plan",
          "unit": "month",
          "usd": 7,
          "note": "3 million calls, $75 a year"
        },
        {
          "item": "Pro+ plan",
          "unit": "month",
          "usd": 25,
          "note": "5 million calls, $270 a year"
        },
        {
          "item": "Business plan",
          "unit": "month",
          "usd": 65,
          "note": "10 million calls, $702 a year"
        },
        {
          "item": "Call on Starter, at the plan cap",
          "unit": "1k-requests",
          "usd": 0.0023,
          "note": "$7 over 3 million calls"
        },
        {
          "item": "Call on Business, at the plan cap",
          "unit": "1k-requests",
          "usd": 0.0065,
          "note": "$65 over 10 million calls"
        }
      ],
      "provenance": {
        "legalEntity": "Zoomash Ltd",
        "domain": "weatherapi.com",
        "domainRegistered": "2014-11-29",
        "endpointOnVendorDomain": true,
        "terms": "https://www.weatherapi.com/terms.aspx",
        "privacy": "https://www.weatherapi.com/privacy.aspx",
        "statusPage": "https://status.weatherapi.com/",
        "changelog": "https://www.weatherapi.com/api-changelog.html",
        "securityTxt": "none",
        "checked": "2026-10-01",
        "notes": [
          "The terms name Zoomash Ltd under the law of England and Wales but give no registered address or company number, and the privacy policy names no entity beyond WeatherAPI.com.",
          "The privacy policy says personal data may be transferred to the USA, Russia, Japan, China and India, and names Stripe for payments.",
          "The status page at status.weatherapi.com runs on Better Stack.",
          "www.weatherapi.com/.well-known/security.txt returns an HTML error page per the 30 September check."
        ],
        "score": 90
      },
      "dataQuality": {
        "coverage": "Global, any coordinate, city, postcode or IP",
        "coverageRating": 4,
        "freshness": "Not stated. The terms allow current conditions to be cached for 60 minutes",
        "freshnessClass": "hourly",
        "history": "From 2010-01-01 on Business, 365 days on Pro+",
        "historyYears": 16,
        "methodology": "",
        "sourcesDisclosed": false,
        "licence": "Proprietary. Cache limits, no resale, attribution on Free",
        "licenceClass": "clear",
        "standing": "",
        "standingClass": "none",
        "reuse": "The terms cap caching at 60 minutes for current and 24 hours for forecast, forbid selling the data on, and end any right to keep it when the subscription ends. Showing it in your own app or service is allowed.",
        "score": 49,
        "checks": null
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/weatherapi-com.json",
      "live": {
        "slug": "weatherapi-com",
        "probe": {
          "target": "https://api.weatherapi.com/v1",
          "method": "get",
          "lastAt": "2026-10-04T23:32:56.734983464Z",
          "lastOk": true,
          "lastStatus": 404,
          "lastMs": 60,
          "authRequired": false,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 61,
          "p95ms24h": 150,
          "samples24h": 272,
          "samples30d": 895,
          "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": 267,
              "ok": 267
            }
          ]
        },
        "vendorStatus": {
          "page": "https://status.weatherapi.com",
          "indicator": "unknown",
          "summary": "no machine-readable status found",
          "checkedAt": "2026-10-04T21:40:34.084084756Z"
        },
        "securityTxt": {
          "url": "https://weatherapi.com/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-04T15:15:50.54150115Z"
        },
        "llmsTxt": {
          "url": "https://www.weatherapi.com/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-04T15:18:21.6959677Z"
        },
        "domain": {
          "domain": "weatherapi.com",
          "registered": "2014-11-29",
          "source": "https://rdap.verisign.com/com/v1/domain/weatherapi.com",
          "checkedAt": "2026-10-04T13:06:50.954163408Z"
        },
        "pages": [
          {
            "url": "https://www.weatherapi.com/api-changelog.html",
            "kind": "changelog",
            "status": 200,
            "checkedAt": "2026-10-04T15:52:53.355500992Z",
            "changedAt": "2026-10-04T15:52:53.355500992Z",
            "fingerprint": "27443ff20814"
          },
          {
            "url": "https://www.weatherapi.com/pricing.aspx",
            "kind": "pricing",
            "status": 200,
            "checkedAt": "2026-10-04T15:52:55.401668105Z",
            "changedAt": "2026-10-04T15:52:55.401668105Z",
            "fingerprint": "edf5a49404e3"
          },
          {
            "url": "https://www.weatherapi.com/privacy.aspx",
            "kind": "privacy",
            "status": 200,
            "checkedAt": "2026-10-04T15:52:57.435167177Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "cb9e4a437682"
          },
          {
            "url": "https://www.weatherapi.com/terms.aspx",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-04T15:52:59.433233246Z",
            "changedAt": "0001-01-01T00:00:00Z",
            "fingerprint": "29affc48ca13"
          }
        ],
        "updatedAt": "2026-10-04T23:32:56.734983464Z"
      }
    },
    "summary": "WeatherAPI.com has a score of 65.8 (B) against OpenWeather One Call API's 57.4 (C). Both do weather current. The largest gap is reliability, 45 points."
  },
  "kind": "anchor.page",
  "links": {
    "api": "https://www.anchorterminal.com/api/v1/index.json",
    "html": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherapi-com",
    "json": "https://www.anchorterminal.com/compare/openweather-one-call-vs-weatherapi-com.json",
    "llms": "https://www.anchorterminal.com/llms.txt",
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  "markdown": "WeatherAPI.com has a score of 65.8 (B) against OpenWeather One Call API's 57.4 (C). Both do weather current. The largest gap is reliability, 45 points.\n\n- OpenWeather One Call API: grade C, 57.4/100, rank #294 of 452. Markdown https://www.anchorterminal.com/tools/openweather-one-call.md · JSON https://www.anchorterminal.com/api/v1/tools/openweather-one-call.json\n- WeatherAPI.com: grade B, 65.8/100, rank #169 of 452. Markdown https://www.anchorterminal.com/tools/weatherapi-com.md · JSON https://www.anchorterminal.com/api/v1/tools/weatherapi-com.json\n\n## Which one, for what\n\nPick OpenWeather One Call API for security \u0026 auth (+5), payments \u0026 pricing (+30), maintenance \u0026 community (+15).\n\nPick WeatherAPI.com for reliability (+45), schema \u0026 documentation (+21), agent ergonomics (+7), transparency \u0026 trust (+8).\n\n## Score by category\n\n| Category | Weight | OpenWeather One Call API | WeatherAPI.com | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 45 | 90 | WeatherAPI.com +45 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 68 | 89 | WeatherAPI.com +21 |\n| Agent ergonomics | 13% (16.2 this run) | 73 | 80 | WeatherAPI.com +7 |\n| Security \u0026 auth | 14% (17.5 this run) | 42 | 37 | OpenWeather One Call API +5 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 60 | 30 | OpenWeather One Call API +30 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 60 | 45 | OpenWeather One Call API +15 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 62 | 70 | WeatherAPI.com +8 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **57.4 · C** | **65.8 · B** | |\n\n## Facts side by side\n\n| Fact | OpenWeather One Call API | WeatherAPI.com |\n| --- | --- | --- |\n| Kind | HTTP API | HTTP API |\n| Vendor | OpenWeather | WeatherAPI.com (Zoomash Ltd) |\n| Hosted endpoint | `https://api.openweathermap.org/data/3.0/onecall` | `https://api.weatherapi.com/v1` |\n| Transports | HTTP, Streamable HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Freemium | Freemium |\n| x402 | no | no |\n| Licence | none | none |\n| Tools exposed | 6 | none |\n| Context cost (tools/list) | n/a | n/a |\n| p95 latency | not measured yet | not measured yet |\n| Availability (30d) | not measured yet | not measured yet |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| MCP registry | `org.openweathermap/agents` | not listed |\n| Last release | none | none |\n| Popularity | none | none |\n| Agent reviews | 3.5/5 (2) | 3.5/5 (2) |\n\n## Verdicts\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**WeatherAPI.com.** 3 million calls for $7 a month, and 100,000 a month free with no card. Key only in the query string, and no security.txt.\n\n## Before you call either\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### WeatherAPI.com\n\n1. Pass current_fields, day_fields or hour_fields to cut the response to what you need\n2. Treat a 403 with error code 2007 as the monthly quota, not a bad key. There's no 429\n3. Reuse the id from search.json (q=id:NNN) to avoid ambiguous city names\n4. Cache history freely, current for under an hour and forecasts for under a day, to stay inside the terms\n5. Use https://api.weatherapi.com/v1. The docs still show an http:// base URL\n\n## Other comparisons with OpenWeather One Call API or WeatherAPI.com\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- [AccuWeather Core Weather API + MCP vs WeatherAPI.com](https://www.anchorterminal.com/compare/accuweather-api-vs-weatherapi-com.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- [Google Weather API (Maps Platform) vs WeatherAPI.com](https://www.anchorterminal.com/compare/google-weather-api-vs-weatherapi-com.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- [Met Office Weather DataHub (Site Specific) vs WeatherAPI.com](https://www.anchorterminal.com/compare/met-office-datahub-vs-weatherapi-com.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- [NOAA National Weather Service API (api.weather.gov) vs WeatherAPI.com](https://www.anchorterminal.com/compare/nws-api-vs-weatherapi-com.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 Visual Crossing Weather API](https://www.anchorterminal.com/compare/openweather-one-call-vs-visual-crossing.md)\n- [Pirate Weather vs WeatherAPI.com](https://www.anchorterminal.com/compare/pirate-weather-vs-weatherapi-com.md)\n- [Visual Crossing Weather API vs WeatherAPI.com](https://www.anchorterminal.com/compare/visual-crossing-vs-weatherapi-com.md)\n",
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        "name": "OpenWeather One Call API vs WeatherAPI.com",
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    "description": "WeatherAPI.com has a score of 65.8 (B) against OpenWeather One Call API's 57.4 (C). Both do weather current. The largest gap is reliability, 45 points. Category scores, facts, verdicts and agent notes side by side.",
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    "title": "OpenWeather One Call API vs WeatherAPI.com for AI agents",
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