What is a cheap or free tool for detecting bot clicks on my ads?

A free diagnostic audit is available that records all bots for 60 days and lets you export up to 300 verified bot click dossiers. For ongoing monitoring, a self-service plan starts at $10 per month plus $2 per 1,000 reported bots, which is far cheaper than legacy tools that bill for all visitors. This approach is designed to be affordable for small advertisers while still providing forensic evidence for refund claims.