Resistant AI

Product overview

Resistant AI is a Prague-based company that detects document fraud and monitors financial transactions using AI. Its main product, Resistant Documents, analyzes any PDF or image file to identify forgery, tampering, and synthetic documents in under 20 seconds. The system uses over 500 detectors trained on more than 150 million documents. A second product, Resistant Transactions, adds AI-based detection of suspicious patterns to existing rules-based transaction monitoring systems without replacing them. Founded in 2019 by Martin Rehak (formerly Bulletproof AI), the company has raised around $55 million in total, including a $25 million Series B led by DTCP Growth in late 2025. Other investors include GV (Google Ventures), Index Ventures, Experian, Credo Ventures, and Seedcamp. The team has over 100 employees across Prague, London, and New York. Customers include Payoneer, Dun & Bradstreet, Close Brothers, PennyMac, AXA, Finom, and Bank of Valletta. The company reports that clients see a 3x increase in document fraud prevention, 90% reduction in manual reviews, and 5x faster review times. Resistant AI holds over 100 patents related to its fraud detection technology and has won the ACAMS/PwC Hackathon twice. KEY FEATURES: - Document fraud detection analyzing PDFs and images for forgery in under 20 seconds - Over 500 fraud detectors trained on 150 million+ documents - Transaction monitoring overlay adding AI detection to existing rules-based systems - Serial fraud detection identifying organized groups using similar forged templates - API integration requiring no replacement of existing compliance infrastructure

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