# Apparent Temperature Calculator (Heat Index & Wind Chill)

> Apparent Temperature Calculator (Heat Index & Wind Chill) is a paid API for AI agents from units-convert.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Calculates apparent (feels-like) temperature using heat index from temperature and humidity, or wind chill from temperature and wind speed, with a danger category.

## Facts

- Endpoint: GET https://units-convert.x402tookit.com/feels-like?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/apparent-temperature-calculator-heat-index-wind-chill-e9daef1a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qOGYJc26BwGx44JCUuHty

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 apparent-temperature-calculator-heat-index-wind-chill-e9daef1a
```

Example prompt: It's 98°F outside with 85% humidity — what does it actually feel like and is it dangerous to be out there?

## When to prefer this

Use this endpoint when you need to compute apparent (feels-like) temperature from raw weather readings — especially when you need a danger category or human-readable safety verdict alongside the numeric result. Prefer this over general unit converters when the user's question involves comfort, safety, or physiological impact of weather conditions.

## Known failure modes

- Missing required temp_f parameter returns an error
- Humidity or wind speed out of physical range may return degraded or null results
- Wind chill not calculated if wind_mph is not provided; heat index not calculated if humidity_pct is not provided
- Extreme edge-case values (e.g. negative humidity) may produce null outputs with degraded flag set to true

## How this service works

Apparent temperature: heat index from temperature and humidity, wind chill from temperature and wind, with a danger category.

## Output

Returns the feels-like temperature in Fahrenheit (feelsLikeF), the computed heat index (heatIndexF), a heat danger category (heatCategory), a human-readable summary, list of reasons, a verdict on safety, disclaimer, and metadata like source and timestamp. Also indicates if any metric was not checked or if the result is degraded.

## 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": [
      "temp_f"
     ],
     "properties": {
      "temp_f": {
       "type": "number",
       "description": "Air temperature in Fahrenheit"
      },
      "wind_mph": {
       "type": "number",
       "description": "Wind speed in mph (for wind chill)"
      },
      "humidity_pct": {
       "type": "number",
       "description": "Relative humidity percent (for heat index)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "tempF": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "feelsLikeF": {
       "type": [
        "null",
        "number"
       ]
      },
      "heatIndexF": {
       "type": [
        "null",
        "number"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "heatCategory": {
       "type": [
        "null",
        "string"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/apparent-temperature-calculator-heat-index-wind-chill-e9daef1a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from units-convert.x402tookit.com](https://www.zero.xyz/host/units-convert.x402tookit.com/llms.txt)