# Aviation Weather Fog Risk Assessment

> Aviation Weather Fog Risk Assessment is a paid API for AI agents from aviation-weather.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Calculates fog and low-visibility risk at an airport using temperature-dew point spread, wind speed, and current visibility.

## Facts

- Endpoint: GET https://aviation-weather.x402tookit.com/fog-risk?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aviation-weather-fog-risk-assessment-273fbf6a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ncdvbBIKPBFnICCaHNpkI

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 aviation-weather-fog-risk-assessment-273fbf6a
```

Example prompt: What's the fog and low-visibility risk at KSFO right now — check the temperature-dew point spread and wind to tell me if fog is likely, possible, or unlikely.

## When to prefer this

Use this endpoint when you specifically need a fog or low-visibility risk assessment derived from the temperature-dew point spread at a single airport. It is more targeted than a full METAR decode or forecast — choose it when the question is specifically about fog or IFR visibility risk, not general flight category or wind conditions. Ideal for pre-flight briefings focused on ground fog, radiation fog, or low-ceiling visibility hazards.

## Known failure modes

- Invalid or unrecognized ICAO code returns an error or null fields
- Airport has no live METAR data — response may include degraded flag and null sensor values
- Stale observation data — ageMinutes may be high and disclaimer included
- Network timeout or upstream weather data source unavailable
- Missing required icao query parameter returns a validation error

## How this service works

Fog and low-visibility risk at an airport from the temperature-dew point spread, wind and visibility.

## Output

Returns a structured fog-risk verdict (likely/possible/unlikely or similar), the temperature in Celsius, dew point in Celsius, temperature-dew point spread, wind speed in knots, visibility in miles, a human-readable summary, a list of reasons contributing to the risk, thresholds used for the assessment, observation time, data source URL, data age in minutes, and optional disclaimer or degraded-mode flags.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "icao"
     ],
     "properties": {
      "icao": {
       "type": "string",
       "description": "4-letter ICAO airport code"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "icao": {
       "type": [
        "null",
        "string"
       ]
      },
      "tempC": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "windKt": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "spreadC": {
       "type": [
        "null",
        "number"
       ]
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "weather": {},
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "observed": {
       "type": [
        "null",
        "string"
       ]
      },
      "dewpointC": {
       "type": [
        "null",
        "number"
       ]
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "ageMinutes": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "thresholds": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "calmWindKt": {
         "type": [
  
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aviation-weather-fog-risk-assessment-273fbf6a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aviation-weather.x402tookit.com](https://www.zero.xyz/host/aviation-weather.x402tookit.com/llms.txt)