MFA site

A made-for-advertising (MFA) site is a website built mainly to show ads rather than to serve readers, typically with dense and fast-refreshing ad slots, thin or copied content, and traffic bought from other platforms.

MFA sites run an arbitrage. The operator buys cheap clicks from social or content-recommendation ads, sends the visitors to pages packed with ad slots, and sells those impressions through programmatic exchanges for more than the clicks cost. The visitors are real people, so the traffic often passes invalid-traffic filters, and many pages meet viewability thresholds. What buyers get is brief, low-value attention.

The ANA's 2023 Programmatic Media Supply Chain Transparency Study put MFA on the industry agenda. MFA classification now depends on the vendor. Buyers work from lists kept by verification companies and from signals such as ad-to-content ratio, refresh rate, traffic sources and the share of paid traffic. Exchanges and curators drop domains that fail these checks, and private marketplaces exclude them by design.

Example: The ANA reported in August 2025 that median MFA spend among benchmark participants had fallen to 0.8% of programmatic spend, from 15% two years earlier. Top-quartile marketers on this measure still spent up to 28.7% on MFA domains (ANA, 14 August 2025).

Related terms: brand safety, IVT, open auction, curation, supply path optimization.

Authoritative source: ANA, "Q2 2025 Programmatic Transparency Benchmark" press release (14 August 2025).

Read the full guide: Made-for-advertising sites: how exchanges detect MFA.