Device Tracking Add-on for minFraud and Proxy Detection Services

The device tracking add-on for the minFraud and Proxy Detection services identifies devices as they move across networks and enhances the ability of the minFraud and Proxy Detection services to detect fraud. If a fraudster changes proxies while they are browsing your website or between visits to your website, you will observe an increased proxyScore and/or riskScore in the minFraud and Proxy Detection output associated with their transactions.

Recommended Use

We recommend including the JavaScript below on your shopping cart page or the first page in your checkout process. If you receive a significant number of fraudulent purchases, you may wish to include the JavaScript on other pages in order to detect fraudsters if they change or enable proxies while browsing your website.


Replace USER_ID with your MaxMind user ID.

Cookie and Web Storage Usage

The device tracking add-on uses both a cookie and local storage as one method of distinguishing unique devices. The add-on sets a cookie with a two-year expiration for the effective second-level domain of your site; for instance, on, the cookie would be set for Both the cookie and the local storage key are named __mmapiwsid.

MaxMind may use other browser storage techniques in the future to enhance the performance of the device tracking add-on.