# Vextorium Weather Forecast API

> Vextorium Weather Forecast API is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-11).

Returns current weather conditions and up to 9-day daily forecasts (temperature, precipitation, wind, cloud cover, humidity, pressure, sky state) for any latitude/longitude on Earth, sourced from MET Norway.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/weather?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-weather-forecast-api-f3cdb72a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OsCgy4TyGLo4xAiAZV9Ar

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vextorium-weather-forecast-api-f3cdb72a -d '<json body>'
```

Example prompt: What's the current weather and 5-day forecast for Madrid (latitude 40.42, longitude -3.7)? I need temperature highs and lows, rainfall, wind, and sky conditions each day.

## When to prefer this

Choose this endpoint when you need reliable, globally-covering weather forecasts sourced from MET Norway's authoritative data, especially for agentic workflows that already use x402 micropayment infrastructure. It's ideal for precise lat/lon queries anywhere on Earth, not just major cities, and returns structured JSON well-suited for downstream automation. Prefer it over general-purpose weather APIs when you need consistent daily forecast granularity for up to 9 days with minimal per-call cost.

## Known failure modes

- Missing required lat or lon fields returns a validation error
- Coordinates outside valid ranges (-90 to 90 lat, -180 to 180 lon) may return an error or empty data
- Days value outside 1-9 range may be rejected or clamped to default (3)
- Upstream MET Norway data unavailability may cause a 502 or empty response
- Payment failure (insufficient USDC balance) returns a 402 Payment Required before the forecast is served

## How this service works

Weather forecast for any place on Earth from the Norwegian Meteorological Institute: current conditions and daily max/min temperature, precipitation, wind, cloud cover, humidity, pressure and sky state for up to 9 days.

## Output

A JSON object with the coordinates queried, a 'now' block containing current temperature (°C), sky state, wind speed (km/h), wind direction, humidity (%), pressure (hPa), and cloud cover (%), plus a 'days' array with one entry per requested day containing date, max/min temperature, precipitation (mm), max wind speed, and sky state. Also includes the data source (MET Norway, CC BY 4.0) and last-updated timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "lat",
      "lon"
     ],
     "properties": {
      "lat": {
       "type": "number"
      },
      "lon": {
       "type": "number"
      },
      "days": {
       "type": "integer",
       "description": "1-9 (default 3)"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "lat": {
       "type": [
        "number",
        "null"
       ]
      },
      "lon": {
       "type": [
        "number",
        "null"
       ]
      },
      "now": {
       "type": [
        "object",
        "null"
       ],
       "properties": {
        "sky": {
         "type": [
          "string",
          "null"
         ]
        },
        "wind_kmh": {
         "type": [
          "number",
          "null"
         ]
        },
        "humidity_pct": {
         "type": [
          "number",
          "null"
         ]
        },
        "pressure_hpa": {
         "type": [
          "number",
          "null"
         ]
        },
        "temperature_c": {
         "type": [
          "number",
          "null"
         ]
        },
        "wind_direction": {
         "type": [
          "number",
          "null"
         ]
        },
        "cloud_cover_pct": {
         "type": [
          "number",
          "null"
         ]
        }
       }
      },
      "days": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "object"
        ],
        "properties": {
         "sky": {
          "type": [
           "null",
           "string"
          ]
         },
         "date": {
          "type": [
           "null",
           "string"
          ]
         },
         "max_c": {
          "type": [
     
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "lat": 40.42,
  "lon": -3.7,
  "now": {
   "sky": "heavy rain",
   "wind_kmh": 17,
   "humidity_pct": 96.2,
   "pressure_hpa": 1024.5,
   "temperature_c": 16.4,
   "wind_direction": 30.9,
   "cloud_cover_pct": 98.4
  },
  "days": [
   {
    "sky": "partly cloudy",
    "date": "2026-10-02",
    "max_c": 16.7,
    "min_c": 16.2,
    "rain_mm": 1.4,
    "max_wind_kmh": 17
   },
   {
    "sky": "overcast",
    "date": "2026-10-03",
    "max_c": 20.9,
    "min_c": 15.7,
    "rain_mm": 8,
    "max_wind_kmh": 11
   }
  ],
  "source": "MET Norway (Norwegian Meteorological Institute), CC BY 4.0",
  "updated": "2026-10-02T19:18:06Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-weather-forecast-api-f3cdb72a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)