Sure, Amazon API Gateway is awesome.

But have you considered these open source alternatives?

They are free, self-hostable and community-driven.

Check by yourself: Traefik , Kong , Envoy .

So is Traefik

A reverse proxy for HTTP services
★ 64.5K API gateway Reverse proxy License: MIT
Traefik is a modern HTTP reverse proxy and load balancer that makes deploying microservices easy.

Read more about Traefik
So is Kong

The Cloud-Native API Gateway and AI Gateway
★ 44K API gateway License: Apache-2.0
Kong (or Kong API Gateway) is a cloud-native, platform-agnostic, scalable API Gateway distinguished for its high performance and extensibility via plugins. It also provides advanced AI capabilities with multi-LLM support.

Read more about Kong
So is Envoy

Cloud-native high-performance edge/middle/service proxy
★ 28.8K Reverse proxy Load balancer API gateway Network Observability License: Apache-2.0
A high-performance C++ proxy built for cloud-native microservice deployments.

Envoy acts as a universal data plane for service mesh architectures, providing advanced routing, load balancing, and observability features. Created at Lyft and now a CNCF graduated project used by companies like Airbnb, Netflix, and Uber.

Read more about Envoy