# E-Commerce & Payment Fee Margin Calculator #139 (2.8% + $0.24) (`ecommerce-unit-economics-calc-139`)
- **Status**: 200 OK | **Latency**: 1ms | **Cached**: true
- **Primary Authority**: 100% Platform E-Commerce Unit Economics Engine
- **License & Trust**: 100% Platform Deterministic Compute / Open Reference (computed_by_platform)
- **Verified At (UTC)**: 2026-10-27T17:43:07.297Z
- **Data Freshness**: cached
## Structured Data
```json
{
  "gross_order_value": 100,
  "cogs": 35,
  "gateway_fee": 3.04,
  "net_contribution_margin": 61.96,
  "break_even_roas": 1.61
}
```
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