Private-party cars that fit your buy box, from the cities you choose — before the next dealer messages the seller.
Facebook Marketplace has become one of the largest private-party used-car markets in the US, with sellers listing cars they want gone quickly and often priced below retail. Listings carry the year, make, model, asking price, mileage, location, photos and the seller's description — and they move fast.
Dealers source from it because private-party cars skip the auction fee and the competition of a wholesale lane. The catch is time: searching ten cities by hand every day is not realistic, and the good cars are gone within hours. A monitor that watches for your buy box and alerts you the moment a match appears is what turns Marketplace into a sourcing channel instead of a scroll.
Marketplace requires a logged-in session, renders through heavy JavaScript and actively limits automated access — Facebook's terms restrict it. A Marketplace monitor is therefore kept deliberately small: it runs on your own account, at a low and human pace, on a narrow set of searches, and its job is to alert you rather than to collect data in bulk. I will explain the account risk before you decide whether it is worth it.
Excel, CSV, JSON, a Google Sheet that refreshes on a schedule, a direct write into MySQL or Postgres, or a REST endpoint your own tools can query.
Facebook's terms restrict automated access, so this carries real account risk and is not something to run at volume. When a dealer wants it, it is built as a low-volume alert tool on their own session, and I explain the trade-off first. Many dealers get enough private-party supply from eBay Motors and Craigslist, which carry less risk.
Searches can run several times a day, with an SMS, Telegram or Slack message when a strong match appears — Marketplace cars often sell the same day, so speed is the whole point.
When the seller has included the VIN, yes. Otherwise the alert shows year, model and mileage so you can ask for the VIN, and the MMR range for that car is attached as a guide.
Usually included as one source within a marketplace monitoring build, alongside eBay Motors, Craigslist and government sales. Fixed quote within 24 hours.