Hampden & Co Open Data API
Public, unauthenticated Open Data reference API conforming to the OBIE UK Open Banking Open Data standard (product reference data such as personal and business current accounts). Listed on Hampden & Co's Open Banking register entry; a live Open Data endpoint could not be independently confirmed at bootstrap (the developer portal is a single-page app that returns HTML for all paths), so the surface is represented from documentation rather than a verified base URL.