# SiteCheck Trade & Energy – Freight CO2e Emissions Calculator

> SiteCheck Trade & Energy – Freight CO2e Emissions Calculator is a paid API for AI agents from api.tradeenergy-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Calculates freight CO2e emissions in kg for a shipment using UK Government DESNZ 2025 greenhouse-gas conversion factors, given cargo weight, distance, and transport mode.

## Facts

- Endpoint: GET https://api.tradeenergy-api.workers.dev/api/logistics/co2-freight-emission?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-trade-energy-freight-co2e-emissions-calculator-d6448dd7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UlwYUbuZfqfPajiS1OOnP

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 sitecheck-trade-energy-freight-co2e-emissions-calculator-d6448dd7
```

Example prompt: What are the CO2e emissions in kg for shipping 20 tonnes of cargo by container ship over 18,000 km, using the UK government 2025 DESNZ factors?

## When to prefer this

Choose this endpoint when you need UK Government DESNZ 2025-aligned CO2e calculations for freight shipments across a wide range of transport modes (van, HGV, refrigerated HGV, air with/without radiative forcing, rail, sea tanker, cargo ship). Prefer it over generic carbon calculators when GHG Protocol alignment and official UK factor provenance are required for Scope 3 reporting or sustainability disclosures. Not a substitute for the GLEC framework tool.

## Known failure modes

- Missing required parameters (mode, tonnes, km) returns a validation error
- Unrecognised mode value returns no matching factor
- Ambiguous 'type' sub-type string may match zero or multiple rows
- Distance or weight values of zero or negative may produce erroneous results
- DESNZ factor set updates may not yet be reflected if crawl is stale

## How this service works

Freight CO2e emissions for a shipment: tonnes × distance (km) × the UK Government (DESNZ) 2025 greenhouse-gas conversion factor for the chosen mode — van, HGV, refrigerated HGV, air freight (with or without radiative forcing), rail, tankers or cargo ships by vessel type and size. Returns kg CO2e per matching factor. Uses DESNZ factors (aligned with the GHG Protocol), not the GLEC tool itself.

## Output

Returns a JSON object with the shipment's total kg CO2e, the matched vehicle/vessel label and factor ID, kg CO2e per tonne-km, total tonne-km, the source URL of the DESNZ 2025 factor set, and the number of matching factors 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": [
      "mode",
      "tonnes",
      "km"
     ],
     "properties": {
      "km": {
       "type": "string",
       "description": "Distance in km, e.g. 18000 (required)"
      },
      "mode": {
       "type": "string",
       "description": "Transport mode: van, hgv, hgv-refrigerated, air, rail, sea-tanker, cargo-ship (required)"
      },
      "type": {
       "type": "string",
       "description": "Optional words to pick the vehicle/vessel row, e.g. 'articulated average', 'container ship 8000+', 'long-haul with rf' (default: rows marked Average where published)"
      },
      "tonnes": {
       "type": "string",
       "description": "Cargo weight in tonnes, e.g. 20 (required)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "km": 18000,
  "mode": "Cargo ship",
  "count": 1,
  "source": "https://www.gov.uk/government/publications/greenhouse-gas-reporting-conversion-factors-2025",
  "tonnes": 20,
  "results": [
   {
    "kgCo2e": 5803.2,
    "vehicle": "Container ship · Average",
    "factorId": "27_320_3235_14_1",
    "kgCo2ePerTonneKm": 0.01612
   }
  ],
  "tonneKm": 360000,
  "factorSet": "UK Government GHG Conversion Factors 2025 (DESNZ), Freighting goods, kg CO2e per tonne.km"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-trade-energy-freight-co2e-emissions-calculator-d6448dd7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.tradeenergy-api.workers.dev](https://www.zero.xyz/host/api.tradeenergy-api.workers.dev/llms.txt)