# Automotive Towing Payload Calculator

> Automotive Towing Payload Calculator is a paid API for AI agents from automotive-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Checks whether a vehicle-trailer combination is safe by calculating payload remaining after occupants, cargo, and tongue weight against tow rating and combined weight limits.

## Facts

- Endpoint: GET https://automotive-calc.x402tookit.com/towing-payload?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/automotive-towing-payload-calculator-e2ed07cd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tzFcRj5T4m7fTdVIc787x

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 automotive-towing-payload-calculator-e2ed07cd
```

Example prompt: Can you check if my F-150 can safely tow my camper — it has a GVWR of 7,000 lb, curb weight of 4,900 lb, tow rating of 11,000 lb, the loaded trailer weighs 8,500 lb, and there will be 400 lb of people and gear in the truck?

## When to prefer this

Use this endpoint when you need a structured, multi-limit towing safety check that simultaneously evaluates payload capacity, tongue weight, tow rating, and optional GCWR in a single call. It is purpose-built for automotive towing scenarios and returns a clear pass/warn/fail verdict with itemized issues, making it ideal for agents answering 'can I tow this?' questions without requiring manual weight arithmetic.

## Known failure modes

- Missing required parameters (gvwr, curbWeight, trailerWeight, towRating) returns a 400 error
- Physically impossible inputs (e.g. curb weight greater than GVWR) may return degraded or flagged results
- GCWR check skipped if gcwr parameter is not provided (noted in notChecked field)
- Extreme or nonsensical weight values may produce unreliable results

## How this service works

Towing check in pounds: payload left after people, cargo and tongue weight, tow rating and combined weight limits.

## Output

Returns a structured verdict (pass/warn/fail) with calculated payload used, payload remaining, tongue weight in pounds, combined weight, GCWR remaining, trailer weight vs tow rating comparison, a human-readable summary, and a list of any issues or limit violations 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": [
      "gvwr",
      "curbWeight",
      "trailerWeight",
      "towRating"
     ],
     "properties": {
      "gcwr": {
       "type": "number",
       "description": "Gross combined weight rating, lb, to check the whole rig"
      },
      "gvwr": {
       "type": "number",
       "description": "Vehicle gross vehicle weight rating, lb (door-jamb sticker)"
      },
      "towRating": {
       "type": "number",
       "description": "Maximum trailer weight the vehicle is rated to tow, lb"
      },
      "curbWeight": {
       "type": "number",
       "description": "Vehicle weight empty with fluids, lb"
      },
      "tonguePercent": {
       "type": "number",
       "description": "Tongue weight as % of trailer weight, 5 to 30 (default 12; 10 to 15 for a bumper-pull trailer)"
      },
      "trailerWeight": {
       "type": "number",
       "description": "Loaded trailer weight, lb"
      },
      "occupantsAndCargo": {
       "type": "number",
       "description": "People plus cargo in the vehicle, lb (default 0)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "gcwrLb": {
       "type": [
        "null",
        "number"
       ]
      },
      "issues": {
       "type": [
        "array",
        "null"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/automotive-towing-payload-calculator-e2ed07cd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from automotive-calc.x402tookit.com](https://www.zero.xyz/host/automotive-calc.x402tookit.com/llms.txt)