https://grafana.com/oss/k6/?pg=k6-cloud&plcmt=hero-btn-2
Grafana k6 is an open source load testing tool that uses test scripts written in JavaScript to help you easily find and fix issues before they reach production.
load testing toolopen sourcegrafana
https://www.c-sharpcorner.com/Resources/3192/webapi-load-performance-testing-tool.aspx
In this part of content you can find the solution of how to test performance of any web site and web API.
load performance testingwebapitool