PerimeterX Bot Defender®

Stop automated bot attacks

PerimeterX Bot Defender is a behavior-based bot management solution that protects your websites, mobile applications and APIs from automated attacks, safeguarding your online revenue, reducing the risk of data breaches and improving operational efficiency.


Reduce Risk From Bot Attacks

Maintain your brand reputation, avoid costs associated with bot-related security issues and increase your users’ confidence and trust by stopping bot attacks.


Protect Your Online Revenue

Increase your customer loyalty, maintain your competitive edge, protect your SEO ranking and make better business decisions by blocking malicious bots.


Improve Operational Efficiency

Enable your team to focus on innovation and growth, and save on resource consumption by blocking unwanted bot traffic at the edge and optimizing the use and performance of your web infrastructure.

Read the Product Brief
Case Study

With PerimeterX automation through AI fingerprinting we could identify the good traffic from the bad, including very sophisticated attacks — which pays for itself. The fact that it’s been done automatically has been critical to our site reliability and site uptime.

Dan DavisVP of Technology at

Why PerimeterX

PerimeterX Technology Platform Works With Your Existing Infrastructure

Bot Defender can be deployed anywhere with your existing infrastructure — no changes required. PerimeterX Technology Platform can be integrated into any website within minutes. Over forty pre-built PerimeterX Enforcer integrations support a wide range of content delivery networks (CDNs), load balancers, web servers and application servers. The out-of-band mode of operation is compatible with any cloud-based, appliance-based or serverless infrastructure.

Best-in-class Bot Protection for Your Web Apps, Mobile Apps and APIs

Safeguard your business with industry-leading bot detection accuracy and customizable mitigation for web and mobile applications and APIs. Bot Defender uses a combination of fingerprinting, behavior-based and predictive methods to detect bots and stop hyper-distributed attacks.

Block and Mitigate Bots with Unmatched Precision

The machine-learning-based PerimeterX Detector processes numerous data signals collected by the PerimeterX Sensor. The Detector generates behavioral fingerprints to detect anomalies and continuously updates the Sensor with new intelligence. The PerimeterX Enforcer is integrated inline with existing infrastructure to efficiently mitigate unwanted bot traffic based on the insights provided by the system and according to your business needs.

See How It Works

Preserve Page Load Performance

Bot Defender preserves your real users’ experience without sacrificing page load performance. The asynchronous execution of the sensor, out-of-band detector deployment, inline integration of the enforcer and extremely low false-positive rates ensure quick response times and a positive experience for your users.

Minimize User Friction with a User-friendly Verification

PerimeterX Human Challenge is a user-friendly verification that protects your web and mobile applications from CAPTCHA-solving bots while also improving your users’ experience. By collecting in-depth behavioral data about the user, Human Challenge detects and blocks CAPTCHA-solving bots, whether they use automated or manual methods.

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Enable Your Team to Investigate, Analyze and Report

Bot Defender provides advanced investigation, analysis and reporting capabilities, enabling customization of parameters and policies according to your business needs.

Stay Secure with Always-available Proactive Experts

Our 24/7/365 proactive security team is always available via multiple channels, including email, phone and Slack. They function as an extension of your team, investigating and resolving security incidents with insights and expertise you can count on.

Powered by the PerimeterX Platform

The PerimeterX Platform is a set of cloud-native infrastructure and services that powers an award-winning suite of application protection solutions. PerimeterX Bot Defender, PerimeterX Code Defender and PerimeterX Page Defender protect online businesses against automated attacks and client-side threats. By using a single, easy to deploy client-side Sensor along with a cloud-based Detector and an Enforcer that integrates with a wide range of server side and edge technologies, you can preserve your existing architecture without impacting user experience. The intuitive Portal enables your operations team to investigate and mitigate multiple threats and greatly improves their operational efficiency.

How Bot Defender Works

  • Collect

    The Sensor collects and sends hundreds of client-side indicators to the detector for precise determination of human versus bot activity. The signals or indicators are used to create the device and browser fingerprints. The Sensor does not collect or store PII data.

  • Detect

    The machine learning (ML) based Detector continuously learns the normal range for human interactions, correlates it with customer-defined policies and updates the Sensor with new intelligence. The Detector maintains a growing repository of known attacks, anonymizes and aggregates across all customers to increase accuracy. The Detector frequently updates its training data set and augments its ML features based on internal and external data, which means best-in-class protection.

  • Enforce

    The Enforcer is the gatekeeper for threat response policies generated by the detector. It enriches and mitigates bot traffic according to business needs. The Enforcer also continuously learns and updates the Detector with relevant data. The Enforcer can be deployed inline with any existing server-side web infrastructure.

  • Report

    The cloud-based management Portal displays all activity in real time including attacks, blocked requests and rate-limited good bots. Manage all bot traffic, good and bad, with an intuitive admin interface. With the Portal, you can investigate attacks and create custom reports.

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