The challenge here is to design a solution that addresses these key issues:

High Availability: Ensuring your application is accessible to users around the clock, even when external services may face disruptions.

Automatic Failover: Creating a system that can seamlessly switch to backup resources or alternative services if the primary ones fail.

Securing Endpoints without Authentication: Implementing robust security measures to protect data and communication without requiring users to authenticate separately for each external service.

Proxying 3rd Party APIs: Establishing a unified gateway that acts as an intermediary between your application and multiple third-party APIs, simplifying communication and reducing complexity.

Solution is composed of the following key AWS services and components:

Amazon API Gateway: The core of our architecture, serving as the entry point for all incoming requests. It enables request routing, security enforcement, and proxying to 3rd party APIs.

Amazon Elastic Load Balancer (ELB): We utilize ELB to distribute incoming traffic across multiple instances and availability zones, ensuring high availability and load balancing.

AWS Lambda Functions: To add flexibility and automation, we employ Lambda functions to handle routing logic, traffic management, and automatic failover.

AWS Identity and Access Management (IAM): IAM is used to configure secure access policies for API endpoints without requiring user authentication.