There are four programmatic deal types, and the difference between them is not inventory quality — it is the order in which the publisher's ad server considers your bid, and what the publisher has promised you in exchange. The same mid-roll pod inside the same premium streaming app can be sold as programmatic guaranteed at a fixed $42 CPM, as a preferred deal at $34, inside a private marketplace at a $28 floor, or on the open auction where it clears at $17. The pixel is identical. The certainty is not.
For a luxury advertiser with a defined flight, a limited budget and a media plan that has to hit specific households, that certainty is usually worth paying for — but not always, and not at every level. This is how we evaluate each of the four programmatic deal types at Stillwater Media, what each one actually costs, and how we mix them on a single plan.
The Four Programmatic Deal Types at a Glance
| Deal type | Price | Volume | Auction | Typical premium CTV CPM | Typical fill vs. booked |
|---|---|---|---|---|---|
| Programmatic guaranteed (PG) | Fixed, negotiated | Guaranteed impressions | None — reservation | $38–$65 | 95–100% |
| Preferred deal | Fixed, negotiated | Not guaranteed | None — first look at fixed price | $30–$48 | 15–40% |
| Private marketplace (PMP) | Floor + auction | Not guaranteed | Invite-only auction | $24–$45 | 25–60% |
| Open auction | Auction only | Not guaranteed | Fully open RTB | $14–$28 | Unbounded, uncurated |
Fill percentages are share of the impressions the buyer targeted, not share of a booked commitment — only PG carries a booked commitment. Ranges reflect premium streaming, publisher-direct video and high-index display in North America.
Priority, Not Price, Decides Which Ad Serves
The single most misunderstood mechanic in programmatic buying is that a higher bid does not automatically win. Publishers run a decision sequence in the ad server before the auction is ever consulted. In Google Ad Manager's numbering — where a lower number means higher priority — sponsorship line items sit at priority 4, standard reservations at 6 through 10, and everything non-guaranteed, including preferred deals, private auctions and the open auction, sits at priority 12. Programmatic guaranteed is trafficked as a reservation line item, which is why it clears ahead of a higher-priced PMP bid: it is competing on rank, not price. The practical implication for a luxury plan: if you need a specific pod position on a specific date, no PMP bid at any price will reliably get you there. You need a reservation.
Programmatic Guaranteed: Buying Certainty
Programmatic guaranteed is a directly negotiated insertion order executed through the pipes of the programmatic ecosystem. Impression volume, price, flight dates and placement are fixed in advance. It earns its premium for launch moments where a specific date and share of voice are the point, first-position pod placements in premium originals and live sport, sponsorship-adjacent formats, and any plan where delivery has been promised and the spend committed. What you give up is flexibility — PG impressions are non-cancellable inside a 14-to-30-day notice window, and you should expect a 25% to 60% CPM premium over the same publisher's PMP floor.
Preferred Deals: The First-Look Structure Nobody Uses Correctly
A preferred deal gives one buyer the right of first refusal on matching impressions at a fixed price, with no obligation to buy. Fill is typically 15% to 40% of targeted impressions, because most matching bid requests will not also match the buyer's audience and pacing filters at that moment. Buyers see low fill, conclude the deal is broken, and shut it down. Used correctly, a preferred deal is a hedge — the right structure when you want guaranteed access to a high-index audience at a known price without committing to volume you may not want. We use them most on wealth-indexed publisher supply where the addressable pool is small.
Private Marketplaces: The Workhorse
A private marketplace deal is an invite-only auction. The publisher assigns a deal ID, whitelists your DSP seat, sets a floor, and only bidders holding that deal ID compete. In the OpenRTB bid request this arrives as a pmp object containing a deals array — each deal carrying an id, a bidfloor, an auction type at (1 first price, 2 second price, 3 fixed price), and optional seat and domain restrictions.
PMPs now carry the majority of premium video money — roughly 28% of all programmatic transactions but about 47% of connected TV spend, against roughly 15% of CTV spend on the open exchange. Across syndicated benchmarks, PMP inventory clears around a 2.1x CPM premium over open exchange while delivering roughly 92% viewability against 71%, and invalid traffic near 1.2% against 8.7%. Adjusted for viewability and fraud, the effective cost per usable impression converges — which is the correct way to defend a PMP premium to a finance team.
Open Auction: The Honest Use Case
The open auction is not disreputable. It is unsuited to most of what a luxury brand is trying to do, which is a different claim. It is where an unbounded set of sellers compete, where made-for-advertising sites concentrate, and where the same impression is offered by four intermediaries at four prices. For a private aviation client, the open auction is where we retarget site visitors at $6 to $11 CPMs — a job it does well, because the audience is already qualified. What we do not do is run brand-defining video creative there.
How We Allocate Across the Four Deal Types
| Deal type | Share of video budget | Role |
|---|---|---|
| Programmatic guaranteed | 20–30% | Tentpole moments, first-position pods, guaranteed SOV |
| Private marketplace | 45–60% | Core premium reach, always-on curated supply |
| Preferred deal | 5–15% | First look at scarce high-index publisher audiences |
| Open auction | 10–20% | Retargeting, reach extension, frequency fill |
Two constraints modify this. If the flight is shorter than four weeks, shift toward PG — auction-based deals need time to pace. If the addressable audience is under roughly 400,000 households, shift away from PG, because the guaranteed volume will force frequency past the point of diminishing return.
Five Structural Mistakes We See Repeatedly
- Layering third-party audience segments on top of a curated PMP. The publisher already filtered the supply. Adding a $2.50 CPM data segment typically cuts deliverable scale by 60% to 80% while re-selecting for the same people.
- Setting a DSP bid below the deal floor. The deal shows zero spend and appears broken. Bid at or above the floor or the deal never enters the auction.
- Treating preferred deal fill rate as a performance metric. It is a structural property of first-look mechanics.
- Duplicating the same publisher across PG and PMP without a shared frequency strategy. Caps do not travel between deal types; households get hit twice.
- Accepting a deal ID without the seller's sellers.json entry and SupplyChain object. A deal ID confirms a handshake, not a direct path.
Diagnosing a Deal That Is Not Spending
- Confirm the deal synced to the correct seat. Seat ID mismatches are the most common single cause.
- Check the deal's status in the DSP and confirm flight dates against the publisher's calendar.
- Compare your bid to the floor, including data and DSP fees that reduce the working bid the SSP receives.
- Remove all targeting layers except the deal ID for two hours. If spend appears, a targeting layer is the constraint.
- Pull no-bid reason codes — blocklists, brand safety pre-bid filters, creative format mismatches.
- Ask the publisher for their sell-side view; buy-side reporting cannot see impressions never sent.
Getting the Structure Right Before the Budget Moves
Choosing among programmatic deal types is a decision about how much of your outcome you want to guarantee in advance and what you are willing to pay for that guarantee, made per placement rather than per plan. A brand that puts 100% of its video budget into PG overpays for certainty it does not need; a brand that puts 100% into the open auction gets a plan that cannot be steered. If customer lifetime value exceeds $5,000, the deal structure behind your plan deserves the same scrutiny as the creative.
Work With Stillwater Media
Stillwater Media structures programmatic deals for luxury and high-consideration brands, matching reservation, private marketplace, preferred and open-auction supply to the job each placement actually has to do. We take a limited number of engagements each quarter. Apply to work with us →
