# Fitness and Body Calculators – Calorie Burn by Activity

> Fitness and Body Calculators – Calorie Burn by Activity is a paid API for AI agents from fitness-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Calculates calories burned during a physical activity using MET values, body weight, and duration.

## Facts

- Endpoint: GET https://fitness-calc.x402tookit.com/calorie-burn?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/fitness-and-body-calculators-calorie-burn-by-activity-4990e6ad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jba3pethULqo-TA7x3hVV

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 fitness-and-body-calculators-calorie-burn-by-activity-4990e6ad
```

Example prompt: How many calories would a 75 kg person burn running at 6 mph for 45 minutes? Give me both gross and net kcal.

## When to prefer this

Use this endpoint when you need a quick, science-backed (MET-based) estimate of calories burned for a specific physical activity given body weight and duration. It covers a wide range of activities (running, walking, cycling, swimming, yoga, and more) and returns both gross and net calorie figures. Prefer this over general nutrition APIs when the user's goal is exercise-specific caloric expenditure rather than dietary intake.

## Known failure modes

- Unknown activity name returns an error or degraded result with a list of available activities
- Missing required parameters (activity, weight, minutes) returns a validation error
- Weight or duration outside valid range returns an error
- Invalid unit value returns an error

## How this service works

Calories burned by an activity (walking, running, cycling, swimming and more) from MET values, body weight and duration.

## Output

Returns gross kcal burned, net kcal burned (subtracting resting metabolic rate), kcal per hour, MET value used, activity label, weight in kg, a human-readable summary, the compendium source, a disclaimer, and optionally a list of available activities if the requested one is not found.

## 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": [
      "activity",
      "weight",
      "minutes"
     ],
     "properties": {
      "units": {
       "type": "string",
       "description": "metric (default) or imperial"
      },
      "weight": {
       "type": "number",
       "description": "Body weight in kg (or lb if units=imperial)"
      },
      "minutes": {
       "type": "number",
       "description": "Duration in minutes, 1 to 1440"
      },
      "activity": {
       "type": "string",
       "description": "e.g. running-6mph, walking-3.5mph, cycling-12-14mph, swimming-freestyle-slow, yoga"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "met": {
       "type": [
        "null",
        "number"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "minutes": {
       "type": [
        "null",
        "number"
       ]
      },
      "netKcal": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "activity": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "weightKg": {
       "type": [
        "null",
        "number"
       ]
      },
      "grossKcal": {
       "type": [
        "null",
        "number"
       ]
      },
      "compendium": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
     
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fitness-and-body-calculators-calorie-burn-by-activity-4990e6ad/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fitness-calc.x402tookit.com](https://www.zero.xyz/host/fitness-calc.x402tookit.com/llms.txt)