Open real-time bidding (RTB)
The open auction across many publishers; cheapest CPMs, highest fraud risk.
Marketing & Ad Fraud Glossary
What is programmatic advertising?
Programmatic advertising is the automated buying and selling of digital ad inventory through real-time auctions, using demand-side platforms (DSPs), supply-side platforms (SSPs) and ad exchanges. It powers most display, video, native and connected-TV inventory today.
How programmatic advertising works
In traditional ad buying, a media planner negotiates a deal with a publisher, agrees on a price, and runs a campaign. Programmatic replaces that manual process with software: when a user loads a page, an auction runs in milliseconds, advertisers bid for the impression in real time, and the winning ad is served before the page finishes rendering.
The plumbing is built around three components: advertisers operate inside a demand-side platform (DSP) to set targeting and bid, publishers offer their inventory through a supply-side platform (SSP), and the two meet inside an ad exchange that runs the auction. The whole transaction takes under 100 milliseconds.
The four main types of programmatic buying
Private marketplaces (PMPs)
Invite-only auctions on premium inventory, with vetted publishers.
Programmatic guaranteed
A fixed price and volume commitment with a single publisher, executed programmatically.
Preferred deals
First-look access to a publisher’s inventory at a fixed price before it hits open auction.
Why programmatic carries the highest fraud rate
Programmatic’s strengths — speed, automation, scale across thousands of publishers — are also its weaknesses. The same auction model that lets advertisers reach millions of sites in seconds also makes it impossible to manually inspect each one. Fraudsters exploit that, hiding invalid traffic inside legitimate-looking supply across the long tail of programmatic inventory.
The Opticks Ad Fraud Report 2025 measured a 15.43% invalid-traffic rate on programmatic display — the highest of any channel, and seven times higher than paid search’s 2.18%. Native programmatic ran even higher at 15.9%, and affiliate at 9.09%.
Common programmatic fraud techniques
Domain spoofing
Low-quality inventory disguised as a premium publisher to win higher CPMs.
Ad stacking
Multiple ads layered in one placement; only the top is visible, but all are billed.
Pixel stuffing
Ads crammed into 1×1-pixel frames no human ever sees.
Bot impressions
Automated software loading pages and generating fake auction wins.
Sophisticated invalid traffic (SIVT)
Data-center traffic, hijacked devices, and headless browsers that simulate human behaviour to defeat basic IP filters.
Bid caching
An SSP serves a stale winning bid in a different auction, charging for an impression the buyer never approved.
How to protect programmatic spend
Effective protection in programmatic means scoring every impression in real time — at network, device and behavioural level — rather than relying on after-the-fact reporting or static blocklists. Opticks detects more than 30 types of invalid traffic across programmatic, display, video, native and every other channel, keeping budget on real people.
Source: Opticks Ad Fraud Report 2025 — 2 billion clicks analysed, data through Q1 2026.
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