px-reverse

Reverse PerimeterX SDK collector POST chains to generate valid _px3 and _px2 cookies.

Updated Aug 27, 2026
One-click install
npx skills add https://github.com/warterbili/AUTO_REVERSE --skill px-reverse
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: px-reverse
Source: https://github.com/warterbili/AUTO_REVERSE/tree/main/skills/web/px-reverse
Command: npx skills add https://github.com/warterbili/AUTO_REVERSE --skill px-reverse

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This skill solves the complex, time-consuming process of reverse-engineering PerimeterX (PX) SDK collector traffic to generate valid _px3 or _px2 cookies. Without this skill, developers must manually deobfuscate SDK code, locate cryptographic constants, decode binary OB responses, and reconstruct 200+ field payloads across multiple deployment tiers, often spending 6-12 hours per new site with no guarantee the generated cookie will pass backend trust validation.

Core Features & Use Cases

  • End-to-End PX Cookie Generation: From CDP capture to a working _px3/_px2 generator, covering all 4 validated sites (iFood, Grubhub, Total Wine, Academy) across lenient, strict, and strict+ tiers.
  • Algorithm Reconstruction: Includes 9 bundled Node.js algorithm modules (payload XOR, HMAC-MD5 PC, OB decode, SID steganography, UUID v1, djb2 hash, memory synthesis, anti-tamper, /ns fetch) that have remained stable for 3 years.
  • Cross-Version SDK Analysis: Provides grep-pattern-based location methods, a 27-entry OB handler shape-matching table, and 23 real-world gotchas to handle SDK upgrades without rewriting generators.
  • Strict-Tier Validation: Includes field-by-field diff tools, cross-event consistency checkers, counter synchronization validators, and a 4-way trust matrix to localize whether failures are due to cookie content or transport/IP issues.

Quick Start

Use the px-reverse skill to reverse-engineer a new PX-protected site by providing the target URL and capturing 6 batches of collector traffic via CDP, then run the bundled decode and diff scripts to build a working cookie generator.

Frequently Asked Questions about px-reverse

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I reverse-engineer PerimeterX anti-bot cookies from captured traffic?▼

To reverse-engineer PerimeterX cookies, capture 6 batches of collector POST traffic via Chrome CDP, then apply bundled algorithm modules to reconstruct payloads, decode OB responses, and generate valid _px3 or _px2 cookies for validated sites.

How does PerimeterX SDK collector traffic analysis work for strict tier deployments?▼

PerimeterX strict tier analysis uses field-by-field diff tools, cross-event consistency checkers, and a 4-way trust matrix to validate generated cookies against PX-gated endpoints, localizing whether failures stem from cookie content or transport/IP issues.

Can I generate valid _px3 cookies for sites protected by HUMAN Security across different deployment tiers?▼

Yes, you can generate _px3 cookies for HUMAN Security protected sites across lenient, strict, and strict+ deployment tiers, specifically validated for platforms including iFood, Grubhub, Total Wine, and Academy.

What's the best way to handle PerimeterX SDK upgrades without rewriting cookie generators?▼

To handle PerimeterX SDK upgrades, use grep-pattern-based location methods and a 27-entry OB handler shape-matching table to locate field semantics, avoiding full generator rewrites when SDK code changes occur.

Why does my PerimeterX cookie generation fail backend trust validation on new sites?▼

PerimeterX cookie validation fails when 200+ field payloads are incorrectly reconstructed, requiring 6 batches of cold-visit samples and algorithm modules like payload XOR, HMAC-MD5 PC, and SID steganography to ensure accurate payload generation.

Do I need Chrome CDP capture to reverse PX anti-bot cookies?▼

Yes, Chrome CDP capture is required to collect the 6 batches of cold-visit collector traffic samples needed to reconstruct payloads and validate generators against PX-gated endpoints.