PerimeterX

PerimeterX was founded in 2014 and is headquartered in San Mateo, California, with R&D operations in Tel Aviv. The company was acquired by HUMAN Security in 2023, forming a combined entity focused on bot mitigation and fraud prevention.

PerimeterX built software designed to detect and block automated bot traffic targeting web applications, mobile apps, and APIs. Its technology analyzes behavioral signals to distinguish human users from bots, addressing threats such as credential stuffing, account takeover, web scraping, and carding attacks. Primary buyers were e-commerce, media, and financial services companies, typically sold through enterprise contracts to security and fraud operations teams.

The flagship product, Bot Defender, protected web and mobile surfaces from automated abuse. Code Defender addressed client-side supply chain attacks — specifically, malicious JavaScript injections that can exfiltrate payment data from checkout pages (a category sometimes called Magecart attacks). Page Defender provided additional protection against unauthorized ad injection and content violations on publisher sites.

PerimeterX competed directly with Akamai Bot Manager, Cloudflare Bot Management, DataDome, and Imperva Advanced Bot Protection. The company's acquisition by HUMAN Security in 2023 was a consolidation move in the bot-mitigation space, combining PerimeterX's web-application focus with HUMAN's advertising fraud and threat intelligence capabilities.

PerimeterX maintained a significant R&D center in Tel Aviv. The Israeli team was the core engineering hub for the company's detection technology. Several of the company's founders and technical leaders had backgrounds in Israeli cybersecurity.