TradAI Final Architecture - Cost Analysis¶

┌─────────────────────────────────────────────────────────────┐
│                    Monthly Cost: $99.45                      │
├─────────────────────────────────────────────────────────────┤
│                                                              │
│  Long-Running Services    ████████████████████  $36.50 (37%)│
│  Storage & Database       ███████████           $26.50 (27%)│
│  Networking               █████████             $23.13 (23%)│
│  Observability            █████                 $12.00 (12%)│
│  Security                 ███                   $9.00  (9%) │
│  Serverless               ██                    $4.40  (4%) │
│  On-Demand Tasks          █                     $1.92  (2%) │
│                                                              │
└─────────────────────────────────────────────────────────────┘

NAT Gateway (2 AZs):
├─ Hourly charge: $0.045/hr × 730 hrs × 2 = $65.70
├─ Data processing: $0.045/GB × ~100 GB = $4.50
└─ Total: ~$70/month

NAT Instance (t4g.nano):
├─ Instance: $0.0042/hr × 730 hrs = $3.07
├─ EIP: $0 (attached to instance)
├─ Data: Included
└─ Total: ~$3/month + some overhead = $6.13

SAVINGS: $64/month (91% reduction)

Trade-offs:
- Lower bandwidth (5 Gbps vs 45 Gbps) - acceptable for our workload
- Self-managed (patching, monitoring) - minimal effort with ASG
- Single point of failure - mitigated with ASG health checks

VPC Interface Endpoints:
├─ ECR API: $7/mo × 2 AZs = $14
├─ ECR DKR: $7/mo × 2 AZs = $14
├─ Secrets Manager: $7/mo × 2 AZs = $14 (optional)
└─ Total: $28-42/month

Alternative: Route through NAT Instance
├─ Additional NAT traffic: ~10 GB/month
├─ Cost: $0.045/GB × 10 GB = $0.45/month
└─ Total: ~$0.45/month

SAVINGS: $28-42/month

Trade-offs:
- Slightly higher latency for AWS API calls (~10ms)
- Traffic goes through internet (still encrypted)
- Acceptable for non-high-frequency operations

RDS Multi-AZ:
├─ Primary: $18/month
├─ Standby: $18/month
└─ Total: $36/month

RDS Single-AZ:
└─ Total: $18/month

SAVINGS: $18/month (50% reduction)

Trade-offs:
- No automatic failover
- 15-30 minute recovery on failure
- Acceptable for dev/staging environments

Production recommendation:
- Keep Multi-AZ for production
- Use Single-AZ for dev/staging

Fargate On-Demand (Strategy Tasks):
├─ 50 runs × 30 min × $0.04/hr = $10/month
└─ Total: ~$10/month

Fargate Spot:
├─ 70% discount on Fargate pricing
├─ 50 runs × 30 min × $0.012/hr = $3/month
└─ Total: ~$3/month

SAVINGS: $7/month (70% reduction)

Trade-offs:
- Tasks may be interrupted (2-minute warning)
- Mitigation: Checkpoint progress to S3
- Acceptable for batch processing (backtests)

30-day retention:
├─ 10 GB × $0.50/GB ingestion = $5
├─ 10 GB × $0.03/GB storage × 30 days = $9
└─ Total: ~$14/month

7-day retention:
├─ 10 GB × $0.50/GB ingestion = $5
├─ 10 GB × $0.03/GB storage × 7 days = $2.10
└─ Total: ~$7/month

SAVINGS: $7/month (50% reduction)

Trade-offs:
- Shorter debugging window
- Mitigation: Export important logs to S3 for long-term storage

Without lifecycle:
├─ Temp files accumulate
├─ 100 GB × $0.023/GB = $2.30
└─ Growing over time

With lifecycle:
├─ Temp files deleted after 7 days
├─ Results archived to Glacier after 30 days
├─ ~40 GB average = $1.00
└─ Stable cost

SAVINGS: $1.30/month + prevents cost growth

RDS On-Demand:
└─ db.t4g.micro: $18/month

RDS Reserved (1-year, no upfront):
└─ db.t4g.micro: $12/month

SAVINGS: $6/month (33% reduction)

Requirements:
- 1-year commitment
- Wait 1 month to verify stable usage

Current architecture supports 50-200 backtests/month at ~$100/month

At 500+ backtests/month:
- Consider provisioned Step Functions
- Consider reserved Fargate capacity
- Estimated cost: ~$150/month

At 1000+ backtests/month:
- Consider dedicated EC2 instances for backtesting
- Consider Kubernetes (EKS) for orchestration
- Estimated cost: ~$300/month

Budget Configuration:
├─ Monthly Budget: $100
├─ Alert 1: 50% ($50) - Email notification
├─ Alert 2: 80% ($80) - Email + Slack notification
├─ Alert 3: 100% ($100) - Email + Slack + PagerDuty
└─ Forecast Alert: 110% projected - Email notification

Required Tags:
├─ Application: tradai
├─ Environment: production | staging | dev
├─ Service: backend-api | data-collection | mlflow | strategy
├─ Owner: team-name
└─ CostCenter: trading-platform

Monthly by Service:
- Filter: Application = tradai
- Group by: Service tag
- Time: Last 3 months

Daily Trend:
- Filter: Application = tradai
- Group by: Day
- Time: Last 30 days

Anomaly Detection:
- Enable AWS Cost Anomaly Detection
- Threshold: 20% above normal
- Alert: Email + Slack