This article covers the top 5 API security testing companies in the USA, emphasizing their expertise in detecting and safeguarding against key API vulnerabilities like data leaks and weak authentication.APIs are susceptible to critical vulnerabilities, including data exposure, insecure endpoints, injection attacks and lack of encryption, putting sensitive data at risk of exploitation.Leading companies like OptiSol, F5, Palo Alto Networks, Imperva, and Salt Security offer advanced, industry-specific API security testing services, combining innovation, real-time threat detection and compliance-focused solutions to protect digital ecosystems.