PerimeterX was an anti-bot and account-protection vendor that merged with HUMAN Security in 2022; its detection product now runs as HUMAN Bot Defender, still recognizable by its original _px3 and _pxde cookies, scoring requests via device fingerprinting, behavioral analysis, and network reputation across e-commerce and enterprise sites.
HUMAN Security (formerly White Ops) and PerimeterX merged in July 2022 into a combined company valued at roughly $1.5 billion, with PerimeterX's product continuing on as HUMAN Bot Defender. HUMAN brought strength in advertising, media, and threat detection; PerimeterX brought e-commerce and enterprise bot-defense engineering — the merger combined both into one platform.
The cookie names — _px3 and _pxde — were deliberately left unchanged so existing customer integrations kept working, which is why "PerimeterX" is still the term people search and the cookies still reference it, even though the product and company name have both moved on.
HUMAN Bot Defender collects device and browser signals via an embedded JavaScript payload — similar in structure to Akamai's sensor data or DataDome's scoring script — and combines them with behavioral analysis and network reputation to produce a trust score per request. A block typically surfaces as a 403 response, sometimes accompanied by a px-captcha challenge or an "Access to this page has been denied" block page referencing PerimeterX or HUMAN.
As with the other enterprise anti-bot vendors, the durable approach is a coherent request identity across every signal layer, since the scoring model updates continuously and a technique tuned against one snapshot of it degrades over time.
How Crawlora handles this
Crawlora's browser-rendering tier produces the same kind of coherent, real-browser signal that HUMAN Bot Defender's sensor collection expects — rather than trying to fabricate the payload outside an actual browser context.
Glossary
FAQ
Not independently — it merged with HUMAN Security in July 2022 and its product now runs as HUMAN Bot Defender. The name persists in common usage and in the original cookie names, which is why both terms are still searched interchangeably.
Look for _px3 or _pxde cookies in the response, or a px-captcha challenge page. These identifiers were kept unchanged through the HUMAN merger specifically so existing detection and integration tooling didn't break.
Yes, functionally — the product PerimeterX built continues to operate under HUMAN's ownership with the same core detection mechanics, now developed as part of HUMAN's broader bot-defense and fraud-prevention platform.
Beyond PerimeterX (HUMAN Bot Defender), Crawlora's own docs cover the rest of the stack — browse the APIs, test a request in Playground, and move from scraping infrastructure work to production data workflows.