# Perimeter X Mobile

## **What is PerimeterX Mobile?**

PerimeterX, know simply as px, is a bot management solution that protects mobile applications, APIs, and web apps from automated threats. It differentiates between human and bot traffic using advanced detection mechanisms. While we offer a solution for either the web, hold captcha (pxhc) and mobile version, this documentation focuses specifically on the mobile version used in apps on iOS and Android.

## **How to Detect if an Application is Using PerimeterX**

PerimeterX protection can be identified in mobile app requests by inspecting the headers for specific values:

* **For px3**: Headers resembling `3:5b0de...3c67add:MO...P5VNA==:1000:6xXz...=`
* **For px2**: Headers resembling `2:eyJ1Ijoi...JkZWYyIn0=`

These headers are often passed as `x-px-original-token`, `x-px-authorization`, or `x-px-context`. 

Additionally, look for requests made to URLs such as:

* `https://collector-XXX.perimeterx.net/api/v1/collector/mobile`
* `https://collector-XXX.px-cloud.net/api/v2/collector`

### **Example of PerimeterX-Protected Applications**

Some applications known to use PerimeterX for mobile protection include:

<table><thead><tr><th>App Name</th><th>Package Name</th></tr></thead><tbody><tr><td>StockX</td><td><pre><code>com.stockx.stockx
</code></pre></td></tr><tr><td>TextNow</td><td><pre><code>com.enflick.android.TextNow
</code></pre></td></tr><tr><td>GrubHub</td><td><pre><code><strong>com.grubhub.android
</strong></code></pre></td></tr><tr><td>My B&#x26;B</td><td><pre><code>com.bathandbody.bbw
</code></pre></td></tr><tr><td>FanDuel</td><td><pre><code><strong>com.fanduel.sportsbook
</strong></code></pre></td></tr></tbody></table>