Cost & Profitability Report¶
Document purpose
This page is a standalone cost summary designed for business meetings, investor presentations, and partner evaluations. It consolidates the key financial metrics from the detailed cost analysis pages into a single reference. For full breakdowns, see the individual pages: Summary & Pricing | Infrastructure | Projections | Optimization | Competitive Analysis.
Financial Snapshot¶
$1.27 Per-User Cost / Month (Empirical)
96.0% Gross Margin
15 Breakeven Users
NT$999 Monthly Subscription (Pro)
Unit Economics¶
| Metric | Value | Source |
|---|---|---|
| Revenue per user | NT$999/mo (~$31 USD) | Pro subscription |
| Variable cost per user | $1.27/mo (NT$41) | Empirical Pareto model (50% DAU, 70% peak concurrency) |
| Gross margin per user | NT$958/mo (96.0%) | Revenue minus variable cost |
| Fixed infrastructure | ~$447/mo (NT$14,304) | Always-on baseline (1 worker instance, 1 API instance, Valkey, Aurora, Lambda, VPC) |
| Breakeven | 15 paying users | NT$14,304 / NT$999 = 14.3 |
| CAC target | < NT$2,000 | ~2.1 month payback at NT$958 margin |
| LTV (12-month) | > NT$11,496 | 12 months x NT$958 profit |
| LTV/CAC ratio | > 5.7 | Healthy SaaS benchmark: > 3.0 |
| Monthly churn target | < 5% | Multi-market stickiness reduces switching |
Cost Scaling Summary¶
| Users | Monthly Cost (USD) | Per-User | Revenue (TWD) | Net Margin | Key Change |
|---|---|---|---|---|---|
| 15 | $447 | $29.80 | NT$14,985 | Breakeven | Fixed costs only |
| 100 | $512 | $5.12 | NT$99,900 | 84% | 2 worker instances |
| 500 | $1,055 | $2.11 | NT$499,500 | 93% | 6 worker instances |
| 1,000 | $1,815 | $1.82 | NT$999,000 | 94% | Multi-AZ RDS |
| 5,000 | $4,270 | $0.85 | NT$4,995,000 | 97% | r6i.2xlarge, read replica |
| 10,000 | $8,024 | $0.80 | NT$9,990,000 | 97.4% | r6i.4xlarge, 100K ECPU |
| 100,000 | $56,500 | $0.57 | NT$99,900,000 | 98.2% | r6i.8xlarge cluster |
Full tiered breakdown with component-level detail: Projections & Profitability.
Why Costs Are Low¶
| Optimization | Impact | Detail |
|---|---|---|
| EC2 over Fargate | 75% savings on worker compute | Fargate charges per-vCPU/per-GB premium; EC2 capacity providers run 30 workers on one r6i.large |
| Bridge networking | 2x task density | Workers share host ENI instead of one ENI per task (awsvpc limit: ~3 per large instance) |
| Pool pre-warming | 897ms startup vs 45-60s cold | Pre-warmed workers claimed via SQS; no cold EC2 launches in the hot path |
| 30-min idle timeout | 55% cost reduction | Workers self-terminate after inactivity; empirical per-user cost drops from $2.79 to $1.27 |
| Lambda orchestration | $8.50/mo total | Five Lambda functions replace a dedicated orchestrator EC2 instance |
| No NAT Gateway | $35/mo saved | Workers in public subnets with security groups; outbound-only to broker APIs |
| Shared public IP | 97% IP cost savings | Bridge networking shares one host IP instead of 30 ENI-attached IPs |
Competitive Cost Position¶
| Platform | Monthly Fee | Markets | 4pass Advantage |
|---|---|---|---|
| MultiCharts + data | NT$43,800+ upfront + NT$14K/yr data | TW only | No upfront; NT$999/mo covers TW + Crypto + US |
| 3Commas | NT$480-1,920/mo | Crypto only | Multi-market + per-user isolation |
| 下單大師 | NT$255-999/mo | TW only | Add crypto + US; cloud SaaS, no desktop |
| QuantConnect | ~NT$1,920/mo+ | US only | TradingView-native; visual builder; TW + Crypto |
| 4pass Pro | NT$999/mo | TW + Crypto + US | Single subscription, all markets, no upfront |
Detailed competitor profiles: Competitive Analysis.
Key Risks and Mitigations¶
| Risk | Likelihood | Mitigation |
|---|---|---|
| Low early adoption (< 15 users) | Medium | Free tier lowers barrier; NT$447/mo burn rate is manageable during ramp |
| Broker SDK dependency (Shioaji ARM64) | Low | x86 production stable; Graviton migration deferred until validated |
| AWS cost increases | Low | RI/Savings Plans lock pricing; multi-cloud not needed at current scale |
| High churn from single-market users | Medium | Multi-market coverage creates switching cost; roadmap adds in-app backtest and native execution |
| TradingView pricing changes | Low | Roadmap includes native strategy execution to reduce TradingView dependency |
Annual Revenue Projections¶
| Users | Annual Revenue (TWD) | Annual Cost (TWD) | Annual Profit (TWD) | Net Margin |
|---|---|---|---|---|
| 100 | NT$1,198,800 | NT$196,608 | NT$1,002,192 | 83.6% |
| 500 | NT$5,994,000 | NT$405,120 | NT$5,588,880 | 93.2% |
| 1,000 | NT$11,988,000 | NT$696,960 | NT$11,291,040 | 94.2% |
| 5,000 | NT$59,940,000 | NT$1,639,680 | NT$58,300,320 | 97.3% |
| 10,000 | NT$119,880,000 | NT$3,081,216 | NT$116,798,784 | 97.4% |
Optimization Levers (Not Yet Applied)¶
| Lever | Trigger | Potential Savings |
|---|---|---|
| 1-year Reserved Instances | 1K users | ~37% on baseline EC2 |
| Graviton (ARM64) instances | 10K users | ~20% on all EC2 |
| Spot instances (mixed strategy) | 5K users | Up to 65% on burst capacity |
| 3-year RI + Savings Plans | 50K users | ~57% on all EC2 |
Full optimization strategies: Cost Optimization.
Report updated: 2026-02 | Region: ap-southeast-1 | Exchange rate: 1 USD = 32 TWD