In this article, the author explores the creation of Lambda-based REST APIs using AWS Lambda functions, specifically focusing on implementing a full REST HTTP API in a single Lambda with GoLang. The article discusses the advantages of this approach, such as cost-effectiveness, with AWS Lambda offering a low-cost solution of 20 cents per million requests and no minimum usage. The author addresses the challenges of converting standard HTTP requests and responses into the JSON format required by AWS Lambda, utilizing tools like the AWS Lambda Go API Proxy and Gorilla Mux for routing. The process involves deploying a container as a Lambda function in AWS, configuring API Gateway to handle routing, and ultimately running the HTTP service both locally and in a Lambda environment. The article concludes by highlighting the flexibility of this deployment model for stateless HTTP services, emphasizing that it remains largely independent of AWS-specific features, allowing developers to maintain familiar workflows with minimal adjustments.