{
  "name": "411 Data API",
  "version": "2.0.0",
  "description": "Vehicle specification data: towing capacity, bolt patterns, and tire sizes. 15,023 records across 3 datasets. The only API combining all three.",
  "documentation": "https://towcapacity411.com/api",
  "datasets": {
    "towing": {
      "records": 4072,
      "makes": 31,
      "models": 99,
      "years": "2015-2026",
      "fields": [
        "trim",
        "engine",
        "drivetrain",
        "max_towing_lbs",
        "max_payload_lbs",
        "gvwr_lbs"
      ]
    },
    "bolt_patterns": {
      "records": 4714,
      "makes": 28,
      "models": 246,
      "years": "1980-2026",
      "fields": [
        "bolt_pattern",
        "lugs",
        "pcd",
        "pcd_inches"
      ]
    },
    "tires": {
      "records": 6237,
      "makes": 26,
      "models": 126,
      "years": "2000-2026",
      "fields": [
        "oem_tire_size",
        "bolt_pattern",
        "tire_pressure",
        "load_index",
        "speed_rating",
        "compatible_sizes",
        "rim_sizes",
        "tpms_type"
      ]
    }
  },
  "endpoints": {
    "GET /v1/makes": "List all vehicle makes across all datasets",
    "GET /v1/models?make=Ford": "List all models for a given make (with dataset availability)",
    "GET /v1/towing?make=Ford&model=F-150": "Query towing capacity (filters: year, trim, drivetrain, engine, min_towing)",
    "GET /v1/bolt-pattern?make=Toyota&model=Camry": "Query bolt patterns (filters: year, pattern)",
    "GET /v1/tires?make=Honda&model=Civic": "Query tire specs (filters: year, trim, tire_size)",
    "GET /v1/vehicle?make=Ford&model=F-150&year=2024": "Combined lookup across all datasets"
  },
  "authentication": "Include X-Api-Key header. Get a free key at https://towcapacity411.com/api",
  "rate_limits": {
    "free": "100 requests/day",
    "starter": "1,000 requests/day",
    "pro": "10,000 requests/day",
    "enterprise": "100,000 requests/day"
  },
  "total_records": 15023
}