A valid request can still be abusive
API abuse can involve automated scraping, repeated resource access, or high-volume activity that misuses an intended feature. Not every problem starts with a malformed request.
Look at the pattern
An isolated call often says little. Consider frequency, identity, endpoint, and outcome together, while avoiding conclusions based solely on a new device or location.
A practical starting point
Identify sensitive business flows, define expected usage, and use appropriate authorization and rate controls. Monitoring can inform a review; it does not replace those controls.
Further reading
This is an introductory overview, not a comprehensive security assessment. For deeper implementation guidance, see OWASP: Bot Management and Anti-Automation.