Click fraud is the deliberate generation of clicks that do not come from users with genuine interest, using bots, scripts, click farms or compromised devices. In affiliate marketing it is used to collect CPC payouts, to meet traffic targets, to plant attribution cookies that steal credit for sales, or to make a traffic source look bigger than it is.
How it works
Fraudulent clicks range from crude to sophisticated:
- Automated traffic from data-center servers, headless browsers and botnets;
- Click farms, where low-paid workers click links manually;
- Hijacked devices, where malware or rogue apps click in the background;
- Click spamming, where large volumes of clicks are fired so that some happen to precede organic conversions.
Google Ads, for example, treats accidental clicks, automated traffic and manual clicks meant to inflate costs as invalid clicks and does not charge advertisers for them. An affiliate program has to make the same call itself, because traffic reaches its tracking links directly.
Example
Example: an affiliate on a $0.20 CPC campaign sends 50,000 clicks in a week. 70% come from hosting-provider IP ranges, many share the same device fingerprint, and the conversion rate is 0.01% against a program average of 2%. Filtering the invalid clicks cuts the payable amount from $10,000 to $3,000 before any further review.
Why it matters
Click fraud distorts every metric built on clicks: EPC, conversion rate and cost per acquisition. On CPC and hybrid deals it costs brands money directly; on CPA deals it pollutes reporting and enables cookie stuffing. Per-click checks such as data-center IP detection, velocity limits, user-agent and header analysis and device fingerprinting, combined into a fraud score, let brands block or flag bad clicks in real time instead of disputing them after payout. A full checklist is in affiliate fraud detection.
Related: fraud score, cookie stuffing, incentivized traffic, country blocking.