Traditional servers idle 80% of the time. You're paying for capacity you don't use.

AWS Lambda: Pay only for compute time. $0.20 per 1M requests.

Our CloudSync Pro handles 10 million requests/day for $420/month.

Why Serverless?

Traditional server (EC2 t3.large):

• Cost: $60/month
• Capacity: ~1,000 requests/second
• Idle cost: $60/month even at 0 traffic

Lambda:

• Cost: $0 at 0 traffic
• Scales instantly to 10,000 concurrent executions
• Pay per request

Architecture

API Gateway 
  → Lambda (authentication)
  → Lambda (business logic)
  → RDS Proxy (connection pooling)
  → PostgreSQL

Cost Optimization Strategies

1. Right-Size Memory

More memory = faster execution = cheaper total cost.

Test:

• 128 MB: 800ms execution, $0.000000208/request
• 512 MB: 200ms execution, $0.000000104/request

Cheaper with more memory!

2. Reuse Connections

// BAD: New DB connection every request
exports.handler = async (event) => {
  const db = await connectDB();
  // ...
};

// GOOD: Reuse connection
let db;
exports.handler = async (event) => {
  if (!db) db = await connectDB();
  // ...
};

3. Batch Processing

Process 100 records at once instead of 100 individual invocations.

Real Metrics

• 10M requests/day
• Average execution: 180ms
• Memory: 512 MB
• Cost: $420/month

Conclusion: Serverless works at scale when optimized correctly.

Learn More About CloudSync Pro