This paper explains how financial services organizations must balance rapid innovation with strict security and compliance requirements as APIs power open banking, payments, and customer engagement. It outlines a complex regulatory landscape, including PCI DSS for card data protection, PSD2 and open banking mandates for secure third-party access, NYDFS cybersecurity rules, ISO/IEC 27001 and 27017 for information security management, and the MITRE ATT&CK framework for understanding API attack tactics. Key security needs include strong authentication, encrypted data transmission, rate limiting, input validation, continuous monitoring, and regular vulnerability testing. The paper emphasizes API posture governance as essential for maintaining visibility, enforcing controls, mitigating threats

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