API Documentation - 411 Data API v3.1.0

Authentication

Pass your API key in the X-Api-Key header on every request. Get a key at RapidAPI.

# Every request requires this header
X-Api-Key: YOUR_API_KEY

Quick Start

// JavaScript example
const res = await fetch(
  'https://411-api.simonwakelin.workers.dev/v1/towing?make=Ford&model=F-150&year=2024',
  { headers: { 'X-Api-Key': 'YOUR_API_KEY' } }
);
const data = await res.json();
console.log(data.results[0].max_towing_lbs); // 13900

Base URL

https://411-api.simonwakelin.workers.dev

AI Natural Language Search

GET /v1/search Ultra + Mega only

Ask any vehicle question in plain English. Returns ranked results with relevance scores. Powered by OpenAI embeddings + 98,363-record vector index.

Param	Type	Required	Description
q	`string`	Yes	Your plain English question

curl 'https://411-api.simonwakelin.workers.dev/v1/search?q=what+oil+does+a+2024+F-150+use' \
  -H 'X-Api-Key: YOUR_API_KEY'

{
  "query": "what oil does a 2024 F-150 use",
  "count": 5,
  "results": [
    {
      "content": "2024 Ford F-150 XLT oil: 6.0 quarts, type: Full Synthetic, viscosity: 5W-30",
      "source": "https://autoapi411.com/oil/Ford/F-150/2024",
      "relevance": 0.89
    }
  ]
}

Towing Capacity

GET/v1/towing

Max towing, payload, GCWR by trim. 28,812 records. 2015-2026.

Param	Type	Description
make	`string`	e.g. Ford, Toyota
model	`string`	e.g. F-150, Tundra
year	`integer`	2015-2026
min_towing	`integer`	Filter by minimum lbs
limit	`integer`	Max results (default 50, max 200)

curl 'https://411-api.simonwakelin.workers.dev/v1/towing?make=Ford&model=F-150&year=2024' \
  -H 'X-Api-Key: YOUR_API_KEY'

Oil Capacity

GET/v1/oil

Oil capacity in quarts, viscosity, and type by engine. 33,931 records. 2001-2026.

Param	Type	Description
make	`string`	e.g. Toyota, Honda
model	`string`	e.g. Camry, Civic
year	`integer`	2001-2026
oil_type	`string`	Filter: Synthetic, Conventional

curl 'https://411-api.simonwakelin.workers.dev/v1/oil?make=Toyota&model=Camry&year=2023' \
  -H 'X-Api-Key: YOUR_API_KEY'

Tire Specifications

GET/v1/tires

OEM tire size, load/speed ratings, TPMS type, compatible sizes. 6,237 records. 2000-2026.

curl 'https://411-api.simonwakelin.workers.dev/v1/tires?make=Honda&model=Civic&year=2022' \
  -H 'X-Api-Key: YOUR_API_KEY'

Bolt Pattern

GET/v1/bolt-pattern

PCD, hub bore, offset range, lug count. 4,714 records. 1980-2026.

curl 'https://411-api.simonwakelin.workers.dev/v1/bolt-pattern?make=Chevy&model=Silverado&year=2021' \
  -H 'X-Api-Key: YOUR_API_KEY'

Horsepower & Torque

GET/v1/horsepower

HP, torque, MPG, fuel type, transmission. 16,269 records. 2000-2026.

curl 'https://411-api.simonwakelin.workers.dev/v1/horsepower?make=Dodge&model=Challenger&year=2023' \
  -H 'X-Api-Key: YOUR_API_KEY'

Vehicle (Combined)

GET/v1/vehicle

All available specs for a vehicle in one call - towing, oil, tires, bolt pattern, HP, wipers, battery, bulbs.

curl 'https://411-api.simonwakelin.workers.dev/v1/vehicle?make=Ford&model=F-150&year=2024' \
  -H 'X-Api-Key: YOUR_API_KEY'

VIN Decoder

GET/v1/vin

Decode any 17-character VIN. Returns make, model, year, plant, check digit validation. 1.6M+ patterns.

Param	Type	Description
vin	`string`	17-character VIN number

curl 'https://411-api.simonwakelin.workers.dev/v1/vin?vin=1FTFW1ET5DFB15689' \
  -H 'X-Api-Key: YOUR_API_KEY'

Makes & Models

GET/v1/makes

List all 65+ available makes with dataset availability flags.

curl 'https://411-api.simonwakelin.workers.dev/v1/makes' -H 'X-Api-Key: YOUR_API_KEY'

GET/v1/models

List all models for a given make.

curl 'https://411-api.simonwakelin.workers.dev/v1/models?make=Ford' -H 'X-Api-Key: YOUR_API_KEY'

Ready to integrate?

Start free (100 req/day). Upgrade anytime. No annual contracts.

Plan	Price	Requests	AI Search
Basic	Free	3,000/mo	No
Pro	$29/mo	50,000/day	No
Ultra	$59/mo	200,000/day	Yes
Mega	$149/mo	1,000,000/day	Yes

Get API Key on RapidAPI

Enterprise / DB snapshots: [email protected]