Census data key
$29 a month
GET /api/v1/data/exportEvery listing, one file per make, as NDJSON
GET /api/v1/data/listingsSearch, with ask_vs_similar and incentive on each car that has one
GET /api/v1/data/listings/{vin}One car, with its price history and the same two fields
$29 is charged today and again every month until you cancel. Cancel on your account page; the key works to the end of the month paid for.