The regulatory response to instant payments is a controlled acceleration. Regulators support speed but are mandating fraud controls in parallel. The EU has written fraud prevention requirements directly into the Instant Payments Regulation. FedNow requires demonstrated security posture before network participation. The UK's Payment Systems Regulator has introduced mandatory reimbursement obligations for authorised push payment (APP) fraud. The pattern across jurisdictions is consistent: instant settlement must be matched with real-time fraud detection and defined liability allocation.