The Federal Reserve flipped the switch today on a long-anticipated upgrade to its instant payments rail. As of 28 April 2026, the FedNow Service rolls out its network intelligence API to early adopters — a development that quietly reshapes the daily workflow of every payment developer building on US real-time rails. For anyone working as a fintech developer UK or payment developer UK with cross-border ambitions, this matters: FedNow now exposes the kind of pre-payment intelligence that previously required years of in-house data engineering. This is more than another endpoint. It is a structural admission that instant payments cannot be safely scaled without instant context. What the FedNow Network Intelligence API Actually Does Until today, a FedNow participant validated a transaction using whatever signals it had locally: device fingerprints, internal velocity rules, KYC history, and bespoke fraud models.…