Bring a Trailer Data Parser & API

Bring a Trailer is the leading online collector-car auction — all three online sales above $1M in September 2025 happened on BaT — and Carapis extracts its full lot data, including rich provenance, options, modifications, photos and sold-price history, through one REST API. Owned by Hearst Autos, BaT’s deep, curated condition write-ups and final-sale records make it a benchmark source for collector-car valuation data.

What is Bring a Trailer?

Bring a Trailer (BaT) is a US-based online auction platform for collector, enthusiast and classic vehicles, owned by Hearst Autos. It runs curated daily lots with detailed editorial descriptions, extensive photo sets and active community commentary. BaT has become the market leader for high-value online collector sales — in September 2025, all three online sales above $1M were on BaT — making its sold-price data a key reference for the collector market.

Market Position

Bring a Trailer leads the online collector-car auction segment, drawing an estimated 8-10M monthly visits and setting the high-water mark for online sale prices: per Hagerty, all three >$1M online sales in September 2025 took place on BaT. Online collector auctions now move 50K+ cars/yr ($2.5B), surpassing live auctions — and BaT’s curated, well-documented lots with public final-sale results make it the richest single source for collector provenance and price-history data.

Data Fields Available

Carapis extracts a complete structured record from each Bring a Trailer lot:

• Vehicle identity — make, model, model year, VIN
• Condition & history — mileage, provenance (ownership/history notes), modifications, factory options
• Auction — final bid / sold price, reserve status, auction end date (the standout sold-price history for collector valuation)
• Listing context — seller type, location, deep photo gallery

Provenance, modifications and public sold-price results are what make BaT’s data uniquely valuable: they support collector-car valuation and trend analysis that thin portal listings cannot — delivered as structured fields.

API Quick Start

import requests
 
resp = requests.get(
    "https://api.carapis.com/v2/listings",
    params={"source": "bring-a-trailer", "limit": 20},
    headers={"Authorization": f"Bearer {API_KEY}"},
)
for car in resp.json()["results"]:
    print(car["make"], car["model"], car["year"], car["price"])

const res = await fetch(
  "https://api.carapis.com/v2/listings?source=bring-a-trailer&limit=20",
  { headers: { Authorization: `Bearer ${process.env.CARAPIS_API_KEY}` } },
);
const { results } = await res.json();

curl "https://api.carapis.com/v2/listings?source=bring-a-trailer&limit=20" \
  -H "Authorization: Bearer $CARAPIS_API_KEY"

Get an API key at my.carapis.com  and see the full API reference. Pricing is on the pricing page.

Use Cases

• Pricing intelligence — public sold-price results and provenance power collector-car valuation models for dealers and specialists.
• Market research — track collector segment trends, model-level results and sell-through. See market research.
• Import / export — provenance and spec depth help cross-border collectors source and vet rare vehicles. See import & export.

Frequently asked questions

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