API Security definition in Cybersecurity

API security refers to the practices and protocols put in place to protect APIs from being exploited. It encompasses measures to secure the transmission of data, authenticate and authorize users, and ensure data integrity.

Open source or Free solutions

1. OAuth 2.0 for secure authorization.
2. OWASP API Security Project provides guidelines and tools.

Paying solutions

1. Apigee by Google Cloud for managing API security.
2. AWS API Gateway for creating, publishing, maintaining, monitoring, and securing APIs at any scale.