AWS HTTP API VS REST API: PRICING, PERFORMANCE & HIDDEN COSTS (2026)
Updated for 2026: This comparison has been refreshed to include AWS’s 2025 addition of native WAF support for HTTP APIs.
“Use HTTP APIs,” they said. “It’s 71% cheaper than REST APIs,” they said.
So you listened. You built your entire serverless backend using AWS API Gateway v2 (HTTP APIs). It was fast, the Terraform was clean, and the bill was low. Then your product manager asked for a simple feature: “Can we throttle Customer A to 100 requests per minute and give Customer B 1,000?” And that is when you realized you made a terrible mistake.
I’ve seen dozens of teams fall for the “cheaper is better” trap only to spend ten times the savings in developer hours trying to hack around missing features.
Who Is This Guide For?
This is for AWS Architects and Backend Developers who are deciding between the “legacy” REST API and the “modern” HTTP API offerings. If you’re building a SaaS product or a public-facing API, you need to read this before you commit to an architecture.
By the end of this, you’ll know:
- The specific feature gaps between REST and HTTP APIs that AWS doesn’t emphasize.
- Why the lower cost of HTTP APIs often leads to higher total ownership costs.
- A clear decision matrix for when to use which API type.
- How these tools fit into your overall Cloud Cost Optimization strategy.
Clarifying the Confusion: API Gateway vs. ALB
Before we dive into the details, let’s clear up a common confusion: “HTTP APIs” vs “REST APIs” are both products inside the AWS API Gateway service.
- REST APIs (API Gateway v1): The original, enterprise-grade, feature-rich, and generally more expensive option.
- HTTP APIs (API Gateway v2): The newer, streamlined, cheaper option.
- ALB (Application Load Balancer): A Layer 7 Load Balancer primarily used for high-throughput traffic without the API management features.
If you’re comparing these, you’re likely also looking at Serverless Security Pitfalls , where choosing the wrong gateway can expose your backend to abuse.
The Feature Gap Nobody Talks About
AWS heavily markets HTTP APIs as the “modern” standard. And yes, in 2025, they finally added WAF support. But for any B2B application, HTTP APIs are still missing the features that actually matter.
1. No Native API Keys or Usage Plans
This is the dealbreaker. In the older REST API (v1), creating a monetized API is native. You create an API Key, assign it to a Usage Plan, and set a quota. In HTTP APIs? This feature does not exist. If you want to throttle a specific tenant, you have to write custom middleware in your Lambda function. You are saving $1.00 on the AWS bill to spend $1,000 in developer time rebuilding basic gateway logic.
2. No Built-in Caching
With REST APIs, you can toggle a checkbox to enable response caching. For read-heavy workloads, this can reduce backend Lambda invocations by 99%. With HTTP APIs, there is no cache. You have to put CloudFront in front of it or implement caching in your application code, adding cost and complexity.
3. Private Endpoints are… Different
If you need an API that is only accessible from within your VPC, REST APIs have “Private Endpoints” that just work. HTTP APIs use “VPC Links” to connect to private resources, but making the API itself private is a different beast involving WAF ACLs. It is not the “click and done” experience of REST.
When to Use Which?
I am not saying HTTP APIs are bad. I use them for internal, server-to-server microservices where I trust the caller and control the traffic volume. But if you are building a product—something with external customers, tiered pricing, or potential abuse vectors—stick to the “legacy” REST APIs.
The extra cost ($3.50/million vs $1.00/million) is negligible compared to the cost of explaining to your boss why you can’t ban a spammy user without deploying code.
The Multi-Cloud Rosetta Stone
If you’re coming from Google Cloud or Azure, here is how the AWS landscape maps to what you know. Note that if you are looking for a true “Full Fat” experience, stick to the REST column.
| Service Type | AWS | Google Cloud (GCP) | Microsoft Azure |
|---|---|---|---|
| The “Full Fat” Gateway | API Gateway (REST) | API Gateway | API Management (APIM) |
| The “Lite” / Proxy | API Gateway (HTTP) | Cloud Run (Direct) | Azure Functions |
| The Load Balancer | ALB | Cloud Load Balancing | Application Gateway |
Summary and Validation
Once you’ve chosen your gateway, validate it by testing your throttling logic. If you chose REST, ensure your Usage Plans actually reject calls over the limit with a 429 status code. If you chose HTTP, be prepared to manage those limits in code.
For more on managing your cloud budget, check out my FinOps Best Practices guide.