An Auction You Never See Decides Where Your Money Goes.

Programmatic advertising is the automated buying and selling of digital ad space through real-time auctions. Rather than negotiating with individual publishers, an advertiser sets targeting and bidding rules in a demand-side platform and software decides in milliseconds which individual impressions to buy and what to pay. It now accounts for roughly 91% of US display spend, so if you run display, native, video, audio or connected TV advertising you are almost certainly buying programmatically already. The visualiser on this page shows a single auction play out across its full 100 milliseconds.

Open exchange display typically runs $1 to $4 CPM and private marketplace inventory $5 to $15, with connected TV considerably higher. But CPM alone is misleading, because it describes what you paid rather than what you received. A $3 CPM at 55% viewability with 16% invalid traffic can cost more per viewable human impression than a $9 CPM at 78% viewability with 4% invalid traffic. The true cost calculator on this page runs that comparison with your own numbers. Management fees are separate and we price them to the work rather than as a fixed percentage of spend.

The open exchange is a public auction where anyone can bid on almost anything. It offers maximum scale and the least control over what your ad appears beside. A private marketplace is an invitation-only auction across a defined set of publishers, so you know where the inventory comes from. The practical difference shows up in quality: reported invalid traffic on open exchanges runs around 14 to 18%, against roughly 3 to 5% on private marketplace deals. Private inventory costs several times more per thousand impressions and frequently costs less per impression a human actually saw.

Ad fraud covers bot traffic, device spoofing and fabricated inventory — impressions billed to you that no person ever saw. Industry estimates put global losses in the tens of billions of dollars annually, and one study of $14.4 billion in programmatic spend across 86 advertisers concluded that roughly 47% went to low-quality or fraudulent inventory. Reported invalid traffic runs 14 to 18% on open exchanges and 3 to 5% on private deals. The defences are unglamorous and effective: ads.txt and sellers.json verification, pre-bid filtering, third-party verification and inclusion lists rather than blocklists.

Under the IAB and MRC standard, a display ad counts as viewable when at least half its pixels are on screen for at least one second, and two seconds for video. The 2026 cross-network average sits near 72% for display and around 79% for video. Above 70% is generally considered good and above 80% excellent. Format matters enormously: desktop leaderboards report near 56% while half-page units reach 82%, on the same inventory at the same price. Dropping structurally weak formats is the cheapest viewability improvement available.

Supply path optimization means reducing the number of intermediaries between your budget and the publisher. The same impression can often be bought through several routes, each with different fees and different fraud exposure, and the shortest path is usually both cheaper and cleaner. Reporting on advertisers who combined supply path optimization with real-time fraud detection describes invalid traffic falling from around 21% of impressions to under 5%. It is one of the highest-return technical changes available and one that few programmatic advertising companies raise unprompted.

Because display is not a last-click channel and judging it as one will always disappoint. Average display conversion sits near 0.71% against roughly 4.4% for paid search, which reflects intent rather than execution: search reaches people already looking, display reaches people who were not. Retargeting converts around twice the display average because those people have already shown interest. Display earns its place through assisted conversions, branded search lift and reach, and should be measured that way.

No, but you should plan around it. Global ad block penetration sits near 31%, close to 38% on desktop web and around 24% on mobile web, and no bidding strategy recovers those users. That is a reason to model reach honestly rather than abandon the channel, and a strong argument for weighting budget toward environments where blocking is impractical — in-app inventory, and connected TV, where blocking is effectively zero.