From next month, Google is to provide more data, as well as tools to help its pay per click advertisers detect and combat click fraud.
The online ad giant will allow PPC advertisers to specify which IP addresses will be prevented from receiving their ads, in order to stop unscrupulous rivals wasting ad budgets with repeated clicks.
This is a smart move towards the greater transparency many advertisers have been demanding.
According to figures from US-based firm ClickForensics, click fraud is continuing to rise, reaching 14.2% in the last quarter of 2006, the highest level all year.
Q4 numbers from the Click Fraud Index suggest that the overall industry average click fraud rate was 14.2%, compared with 13.8% for the third quarter, 14.1% for the second and 13.7% for the first.