Supply chain · also called MFA, made-for-arbitrage, MFA sites
Made-for-advertising (MFA) sites
Made-for-advertising (MFA) sites are websites built mainly to generate ad revenue, typically with thin content, heavy ad density, fast refreshing ads and traffic bought through arbitrage.
An MFA site exists to show ads, not to serve readers. Typical signs include very high ad-to-content ratios, many slots per page, aggressive ad refresh, slideshows or pagination that force extra page views, generic or AI-generated content, and most traffic bought from content recommendation widget widgets or social ads (traffic arbitrage).
MFA inventory is often not fraudulent in the strict sense; the visitors may be human and the ads may be viewable. But it performs poorly for advertisers and soaks up budget because it looks efficient on cheap CPM and viewability metrics. The ANA's 2023 programmatic transparency study found that MFA sites accounted for 21% of impressions and 15% of spend in its sample, which pushed many buyers to act.
Buyers now exclude MFA through DSP and verification vendor classifications, inclusion lists, supply path optimization and curation. There is no single legal definition, so vendors' MFA lists differ, and borderline publishers dispute them. Many SSPs have also started to label or remove MFA supply.
Think of it like this
An MFA site is like a shop full of flashing ad posters with only a few dusty products on the shelves, and people ushered in from the street by paid touts.
An example
A brand finds 18% of its open-auction impressions landed on 400 sites with 30+ ads per page and 90% paid traffic; after excluding them, CPM rises 12% but conversions rise 25%.
Related terms
MFA
MFA is the common abbreviation for made-for-advertising: websites or apps designed primarily to harvest ad revenue from purchased traffic, rather than to serve an audience with genuine content.
Traffic arbitrage
Traffic arbitrage is buying cheap visitors, often through native, social or search ads, and sending them to pages loaded with ads that earn more than the traffic cost.
Ad refresh
Ad refresh is replacing the ad in a slot with a new one while the user stays on the same page, triggered by time, scrolling or user actions, to create more impressions.
Open auction
An open auction is a real-time programmatic auction in which any approved buyer connected to an exchange can bid on a publisher's impressions, without a pre-arranged deal.
Supply path optimization (SPO)
Supply path optimization (SPO) is a buyer's practice of choosing the most direct, cheapest and most trustworthy routes to the same inventory, and cutting unnecessary resellers and duplicate paths.
Sources: ANA: Programmatic Media Supply Chain Transparency Study (first look, 2023)