Headless browsers power credential stuffing, scraping, and checkout abuse. User-agent spoofing alone is no longer sufficient — modern detection stacks layer TLS JA3/JA4 fingerprints, JavaScript environment probes, and request timing entropy.
Signal layering
FraudDefense Bot Detection API evaluates WebGL vendor strings, navigator inconsistencies, automation framework artifacts, and network-level TLS profiles in a single sub-50ms request.