Case Study: Cardmarket stops fake accounts and bot attacks with SEON

How Cardmarket Blocks Fake Accounts and Bot Attacks at Scale with SEON

Cardmarket, Europe’s largest online marketplace for collectible card games, needed help stopping fraud rings and bot attacks that were flooding its registration flow with fake accounts. These attacks used randomized emails and proxies to bypass basic defenses, created manual review work for fraud and support teams, and contaminated marketing and attribution data.

Cardmarket chose SEON and its real-time fraud prevention tools for registration and onboarding, using no-code rules, digital footprint signals, and expert support to block suspicious sign-ups at the source. With SEON, Cardmarket now screens 2,000+ registrations daily, blocks dozens of fake accounts per attack wave in real time, reduces manual support workload, and improves visibility into exploited landing pages without adding friction for legitimate users.

Cardmarket

Olivier Novel

Fraud Analyst