London's High Court delivered a significant ruling on January 15, 2026, rejecting legal challenges from major payment networks—Mastercard, Visa, and Revolut—against the UK's Payment Systems Regulator (PSR). The decision essentially removes a major roadblock, allowing the PSR to proceed with its policy on cross-border interchange fee caps for UK-EEA card transactions. This marks a pivotal moment in reshaping payment system compliance standards across the region, signaling stricter regulatory oversight on transaction costs. For crypto and fintech platforms operating within these jurisdictions, the ruling underscores the evolving regulatory environment around payment infrastructure and competitive fairness.