API-Security-Checklist
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Suggest a powerful free and open source WAF - UUSEC WAF
Introduction
UUSEC WAF Web Application Firewall is an industrial grade free, high-performance, and highly scalable web application and API security protection product that supports AI and semantic engines. It is a comprehensive website protection product launched by UUSEC Technology, which first realizes the three-layer defense function of traffic layer, system layer, and runtime layer.

Github: https://github.com/Safe3/uuWAF
"Web Application Firewall"
I don't think an API needs the same kind of protections as a browser-based web application would need. Does the product you're recommending have anything tailored specifically to APIs?