What is Online Marketplace Fraud?

Online marketplace fraud can include false postings, non‑delivery, counterfeits, triangulation with stolen cards, seller bust‑outs, and collusion that launders value through “sales.” Two‑sided risk means two sets of controls—seller trust and buyer protection—connected by payouts that must be earned, not assumed.

Spot the patterns: newly created sellers with aggressive price cuts, recycled photos, sudden refund requests, and payouts to fresh bank accounts; buyers tied to chargeback‑heavy SKUs, drop addresses, or inhuman redemption speed. Entity graphs reveal rings long before individual cases look suspicious.

Controls: strong KYB for sellers plus signer identity verification, reserves and caps that relax with performance, and automated evidence capture for delivery and disputes—see payment fraud prevention. For buyers, device binding and velocity limits stop farmed accounts from soaking promos. Trust grows when both sides earn it.