Here's a brief overview of the top tools for API Test Automation

Katalon Studio: A comprehensive test automation tool supporting API testing along with web, mobile, and desktop testing.

JMeter: Primarily known for performance testing, Apache JMeter also supports API testing.

Assertible: A tool for automated API testing and monitoring. It offers features for validating API responses and detecting regressions.

Apigee: A platform for API management, Apigee also provides tools for API testing and monitoring.

TestProject: A free test automation platform supporting API testing along with web and mobile testing.

These tools offer various features and capabilities to suit different project requirements and preferences, making them popular choices for API test automation.