AWS ALB vs API Gateway: Cost Analysis for High Throughput and Large Payloads

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When designing cloud architectures on AWS, understanding cost implications is critical. A common comparison is between Application Load Balancer (ALB) and API Gateway, particularly for high-throughput applications.

Cost Breakdown

  • ALB Cost: ~$246.60/month for 1,000 TPS with 1KB payloads.
  • API Gateway REST API Cost: ~$9,072/month for the same throughput.
  • API Gateway HTTP API Cost: ~$2,592/month.

However, ALB’s “Processed Bytes” cost dimension makes it expensive for large payloads (e.g., file uploads/downloads).

Key Considerations

1. Small Payloads: ALB is significantly cheaper.

2. Large Payloads: API Gateway may become cost-effective.

  1. AWS Calculator: Essential for modeling costs (AWS Pricing Calculator).

You Should Know: AWS Cost Optimization Commands & Scripts

1. Estimate ALB Costs via AWS CLI

 Get ALB processed bytes (requires CloudWatch metrics) 
aws cloudwatch get-metric-statistics \ 
--namespace AWS/ApplicationELB \ 
--metric-name ProcessedBytes \ 
--dimensions Name=LoadBalancer,Value=app/my-alb/1234567890abcdef \ 
--start-time $(date -d "-30 days" +%Y-%m-%dT%H:%M:%S) \ 
--end-time $(date +%Y-%m-%dT%H:%M:%S) \ 
--period 86400 \ 
--statistics Sum

2. Compare API Gateway vs ALB Pricing

 Calculate monthly API Gateway REST API cost (Python snippet) 
def api_gateway_cost(tps, payload_kb=1): 
requests_per_month = tps  2.628e6  Seconds in a month 
cost_per_million = 3.50  REST API cost per million requests 
return (requests_per_month / 1e6)  cost_per_million

print(f"API Gateway Cost: ${api_gateway_cost(1000):.2f}/month")

3. Monitor AWS Costs via CLI

 Get current month's AWS spend 
aws ce get-cost-and-usage \ 
--time-period Start=$(date +%Y-%m-01),End=$(date +%Y-%m-%d) \ 
--granularity MONTHLY \ 
--metrics "UnblendedCost"

4. Optimize ALB for Large Files

  • Use S3 Presigned URLs for file transfers instead of ALB.
  • Enable Compression to reduce processed bytes: 
    aws elbv2 modify-load-balancer-attributes \ 
--load-balancer-arn arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/my-alb/1234567890abcdef \ 
--attributes Key=load_balancing.algorithm.type,Value=least_outstanding_requests

What Undercode Say

Choosing between ALB and API Gateway depends on:

  • Throughput (ALB wins for high TPS).
  • Payload Size (API Gateway may be better for large files).
  • Use Case (REST APIs vs. general HTTP traffic).

Linux & AWS Cost-Cutting Commands

 List top 10 cost-driving AWS services 
aws ce get-cost-and-usage \ 
--time-period Start=2024-01-01,End=2024-01-31 \ 
--granularity MONTHLY \ 
--metrics "UnblendedCost" \ 
--group-by Type=DIMENSION,Key=SERVICE

Find unused ALBs 
aws elbv2 describe-load-balancers --query 'LoadBalancers[?State.Code==<code>active</code>].LoadBalancerArn'

Windows Equivalent (PowerShell)

 Get AWS EC2 cost via PowerShell 
Get-CECostAndUsage -TimePeriod @{Start="2024-01-01"; End="2024-01-31"} -Granularity MONTHLY -Metrics @("UnblendedCost")

Expected Output:

A well-optimized AWS architecture balances cost, performance, and scalability. Always:
1. Simulate costs with the AWS Calculator.

2. Monitor usage with CloudWatch and Cost Explorer.

3. Adjust architecture based on real-world traffic patterns.

For deeper insights, refer to AWS Cost Optimization Docs.

References:

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