# Shipping & Logistics Calc – Freight Density

> Shipping & Logistics Calc – Freight Density is a paid API for AI agents from shipping-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-24).

Calculates cargo density (kg/m³ and lb/ft³), stowage factor, and determines whether air or sea freight bills on actual weight or volumetric weight.

## Facts

- Endpoint: GET https://shipping-calc.x402tookit.com/freight-density?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/shipping-logistics-calc-freight-density-95887717
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I1wa5D4YSVa71qlm-h9Ds

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 shipping-logistics-calc-freight-density-95887717
```

Example prompt: I have a cargo shipment that weighs 500 kg and measures 120 cm long, 80 cm wide, and 100 cm tall — can you calculate the freight density in kg/m³ and lb/ft³, the stowage factor, and tell me whether air freight (1:6000 rule) and sea freight will bill on actual weight or volumetric weight?

## When to prefer this

Use this endpoint when you need to determine freight density and classify whether a specific cargo shipment will be billed on gross weight or volumetric weight for air or sea transport — especially when preparing freight quotes, comparing shipping modes, or checking whether a shipment is 'light' (volume-rated) or 'heavy' (weight-rated). Prefer this over dimensional weight endpoints when you need density-specific metrics like kg/m³, lb/ft³, and stowage factor rather than just chargeable weight.

## Known failure modes

- Missing required query parameters (weightKg, length, width, height) returns an error
- Zero or negative dimensions/weight produce invalid results
- Unsupported unit value (not cm, in, or m) may cause incorrect calculation
- Network timeout or service unavailability returns no response

## How this service works

Cargo density in kg/m3 and lb/ft3, stowage factor, and whether air (1:6000) or sea freight bills on weight or volume.

## Output

Returns cargo density in kg/m³ and lb/ft³, cubic metres (CBM), cubic feet, stowage factor in m³ per tonne, air chargeable kg, sea chargeable revenue tons, and a verdict on whether air freight and sea freight each bill on actual weight or volumetric weight, plus a human-readable summary.

## 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": [
      "weightKg",
      "length",
      "width",
      "height"
     ],
     "properties": {
      "unit": {
       "type": "string",
       "description": "cm (default), in or m"
      },
      "width": {
       "type": "number",
       "description": "Cargo width"
      },
      "height": {
       "type": "number",
       "description": "Cargo height"
      },
      "length": {
       "type": "number",
       "description": "Cargo length"
      },
      "weightKg": {
       "type": "number",
       "description": "Gross weight of the cargo in kg"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "cbm": {
       "type": [
        "null",
        "number"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "cubicFeet": {
       "type": [
        "null",
        "number"
       ]
      },
      "airBillsOn": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "seaBillsOn": {
       "type": [
        "null",
        "string"
       ]
      },
      "densityKgPerM3": {
       "type": [
        "null",
        "number"
       ]
      },
  
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/shipping-logistics-calc-freight-density-95887717/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shipping-calc.x402tookit.com](https://www.zero.xyz/host/shipping-calc.x402tookit.com/llms.txt)