This whitepaper explains that using OpenAPI Specification (OAS) schema enforcement as a primary prevention control is insufficient for API security and can backfire operationally. OAS validation cannot understand business logic, so it cannot stop common OWASP API Top 10 threats like BOLA or abuse that requires correlating sequences of calls, and attackers can iteratively probe for bypasses because schema blockers focus on single requests rather than the attacker’s overall behavior. The paper also argues that OAS is frequently incomplete or inaccurate, creating a choice between strict validation that blocks legitimate traffic and harms revenue, or loose validation that lets malicious calls through. It recommends behavior-based prevention that profiles users across time and API activity, ena

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