DNB, AFM, and the EU layer above them.
Dutch financial services are supervised by De Nederlandsche Bank (DNB) for prudential matters and the Autoriteit Financiele Markten (AFM) for market conduct. Both regulators have a long track record of taking digital-finance and AI supervisory questions seriously, with detailed published guidance on AI in the financial sector. The Dutch framework sits underneath the EU-wide regime set by the European Banking Authority (EBA), the European Securities and Markets Authority (ESMA), the European Insurance and Occupational Pensions Authority (EIOPA), and the European Data Protection Board (EDPB).
For a regulated AI platform, the EU layer is where most of the new substance sits: PSD2 today (PSD3 in passage), the Markets in Crypto-Assets Regulation (MiCA), the Digital Operational Resilience Act (DORA), and the EU AI Act. Each one is enforced in the Netherlands by DNB or AFM acting under the harmonised EU regime.