What is a third party lead: third party leads explained for dealerships
A third party lead is a sales enquiry a dealership buys from an independent marketplace or lead aggregator, where the shopper submitted their details on someone else's site rather than on the dealer's own. The dealer pays for it, either per lead or through a monthly subscription, and in many programmes the same enquiry is sold to competing dealers at the same time.
Also written third-party lead, and known in the trade as bought leads, purchased leads, marketplace leads or classified leads. Autotrader, Cars.com, CarGurus and their equivalents in each market are the usual suppliers.
What does third party lead mean, and why dealers buy them
The trade is simple: the marketplace has the audience, you have the stock. Nobody is going to out-spend a national classified site for search traffic on a used model, so dealers rent access to that audience rather than build it.
It is not a small line item. NADA DATA 2025, the National Automobile Dealers Association's annual financial profile of US franchised new-car dealerships, puts third-party listing sites at 20.0% of estimated dealership advertising expenditure in 2025, an average of $117,249 per dealership for the year, against a total average advertising spend of $586,246. Only search engine marketing takes a larger share.
The audience argument holds up too. Cox Automotive's 2025 Car Buyer Journey Study, a survey of 2,344 recent buyers fielded in August and September 2025, found 75% of buyers used a third-party site during their search, against 59% who visited a dealership website.
How are third party leads priced?
- Per lead: a fixed fee for each enquiry delivered. Predictable per unit, unpredictable per month, and the model where junk volume hurts most.
- Subscription or listing package: a monthly fee for inventory placement, with enquiries included. Effective cost per lead falls as your listings perform and rises when they do not.
- Per sale or pay-for-performance: a fee only when a vehicle is sold to a matched shopper. Cleaner on paper, and the matching rules are where the negotiation actually happens.
Whichever model you sign, the number to manage is not the invoice. It is cost per sale: total spend with the provider ÷ vehicles sold from that provider's leads.
Third party lead explained: a worked example
A dealership spends $3,600 a month with one marketplace and receives 240 enquiries. Twenty-two of them are unusable (bad numbers, out of area, duplicates already in the CRM), leaving 218 real ones. Over the following 90 days, 16 buy.
- Cost per lead as invoiced: $3,600 ÷ 240 = $15.00
- Cost per usable lead: $3,600 ÷ 218 = $16.51
- Close rate: 16 ÷ 218 = 7.3%
- Cost per sale: $3,600 ÷ 16 = $225
Now the decision is possible. If average front-end gross on those 16 units is $1,400, the source is comfortably worth keeping. If it is $600 because the marketplace trains shoppers to compare on price, the same 7.3% close rate looks very different, and the conversation with the rep should be about listing quality and lead filtering rather than volume.
Are third party leads exclusive?
Usually not, and this is the question to ask before signing anything.
- Shared or non-exclusive: the enquiry goes to several dealers at once, sometimes as a deliberate quote-comparison product. Cheaper per lead, and you are in a race with two or three competitors from the moment it lands.
- Exclusive: sold to one dealer only. More expensive, and worth the premium mostly when your follow-up is genuinely fast, because exclusivity buys you time you then have to use.
- Effectively shared: nominally exclusive, but the shopper submitted on four sites that evening anyway. Exclusivity is a contract term, never a description of the customer's behaviour.
Get the answer in writing, and ask specifically how many dealers receive each enquiry and whether that number changes by postcode or by stock availability.
What close rate should you expect?
Treat every published benchmark for this with suspicion. The numbers circulating online range from about 3% to well over 12%, they rarely state whether duplicates were stripped or whether the count follows a cohort forward, and a good share are published by the companies selling the leads. A benchmark that does not disclose its method is not a benchmark.
The reliable comparison is internal. Run every source through the same formula, on the same 90-day cohort basis, with duplicates merged, and rank them on cost per sale and gross. Two things are consistently true across stores that do this:
- Third party leads close below website leads. The shopper was researching a category, not your inventory, and they were shown your competitors on the same screen.
- They are more sensitive to response time than any other source. On a shared lead, first useful reply usually wins the conversation.
Third party lead versus OEM lead versus website lead
- Third party: you pay per lead or by subscription, exclusivity is negotiable and often absent, volume is high, intent is broad, and the provider owns the relationship with the shopper.
- OEM lead: no per-lead fee, routed to you by geography, usually brand-specific and new-vehicle heavy, with manufacturer response standards attached.
- Website lead: generated on your own stock, no per-lead cost, lowest volume of the three, and normally the best converting.
Record all three separately in the lead source field and judge them separately. Rolling them into a single internet lead number is how a store ends up cancelling the source that was working and renewing the one that was not.