# Automotive Acceleration & Performance Estimator

> Automotive Acceleration & Performance Estimator 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).

Estimates quarter-mile time and trap speed from vehicle weight and horsepower using the Hale formula, plus a power-limited lower bound for 0-60 mph.

## Facts

- Endpoint: GET https://automotive-calc.x402tookit.com/acceleration-estimate?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-acceleration-performance-estimator-3511e43b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VGTATpKemZGsOB4_OhNM7

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-acceleration-performance-estimator-3511e43b
```

Example prompt: My car weighs 3,200 pounds with me in it and makes 450 horsepower at the crank — what quarter-mile time and trap speed should I expect, and what's my power-limited 0-60 lower bound?

## When to prefer this

Choose this endpoint when you need a quick, formula-based estimate of quarter-mile ET, trap speed, and 0-60 lower bound from weight and horsepower alone, without requiring dyno data or simulation. It is ideal for pre-track planning, build comparisons, or educating users on power-to-weight relationships. Prefer it over simulation tools when speed and simplicity matter more than high-fidelity modeling of aero, traction, or gearing.

## Known failure modes

- Missing required weightLb or horsepower query parameters returns an error
- Weight outside 500–20000 lb range or horsepower outside 10–5000 range may be rejected or return invalid results
- Invalid powerAt value (not 'crank' or 'wheel') may cause misinterpretation
- Payment failure (x402 protocol) returns 402 with payment details before results can be retrieved
- Extreme or physically implausible combinations may produce disclaimer-flagged or degraded outputs

## How this service works

Estimate quarter-mile time and trap speed from weight and horsepower (Hale), plus a power-limited lower bound for 0-60 mph.

## Output

Returns a JSON object containing the quarter-mile elapsed time in seconds, trap speed in mph, a power-limited lower bound for 0-60 mph, crank and wheel horsepower figures, pounds-per-horsepower ratio, power-to-weight in hp/ton, plus a disclaimer, summary, and optional degraded/source metadata fields.

## 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": [
      "weightLb",
      "horsepower"
     ],
     "properties": {
      "powerAt": {
       "type": "string",
       "description": "crank (default) or wheel: where the horsepower figure was measured"
      },
      "weightLb": {
       "type": "number",
       "description": "Weight with driver in pounds, 500 to 20000"
      },
      "horsepower": {
       "type": "number",
       "description": "Engine power in horsepower, 10 to 5000"
      },
      "drivetrainLossPercent": {
       "type": "number",
       "description": "Loss between crank and wheels in % (default 15), used for the 0-60 bound"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "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"
       ]
      },
      "weightLb": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "trapSpeedMph": {
       "type": [
        "null",
        "number"
       ]
      },
      "crankHorsepower": {
       "type": [
        "null",
        "number"
       ]
      },
      "wheelHorsepower": {
       "type": [
        "null",
        "number"
       ]
      },
      "quarterMileSeconds": 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/automotive-acceleration-performance-estimator-3511e43b/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)