# GET /api/v1/inventory/reports/margin-by-sku

> Margin-by-SKU report (landed cost + sales velocity)

- **Tag:** inventory:reports
- **Operation ID:** `get_margin_by_sku_api_v1_inventory_reports_margin_by_sku_get`

## Description

Returns per-variant landed cost (latest cost snapshot), current sell price, gross margin, and trailing Shopify sales over the configured lookback window. Powers the Landed COGS 'Truth' tab.

## Authentication

Bearer token in `Authorization` header.
Required header: `x-business-id: <business uuid>`.

## Parameters

- `lookback_days` (query, integer, optional) — Trailing window (days) used to compute revenue + units sold.
- `limit` (query, integer, optional) — Max variants returned (sorted by trailing revenue desc).

## Responses

### 200 — Successful Response

Schema: `MarginByVariantResponse`

- `rows` (array · MarginRow) → `MarginRow`
  - `variant_id` (string · required)
  - `product_id` (string)
  - `product_name` (string)
  - `variant_name` (string)
  - `sku` (string)
  - `price_cents` (integer · required)
  - `landed_cost_cents` (integer · required)
  - `margin_cents` (integer · required)
  - `margin_pct` (number)
  - `layers` (MarginLayerBreakdown · required) → `MarginLayerBreakdown`
  - `units_sold` (integer)
  - `revenue_cents` (integer)
  - `cogs_cents` (integer)
  - `daily_velocity` (number)
  - `snapshot_month` (string)
  - `snapshot_source` (string)
- `lookback_days` (integer)
- `totals` (MarginTotals) → `MarginTotals`
  - `revenue_cents` (integer)
  - `cogs_cents` (integer)
  - `gross_margin_cents` (integer)
  - `units_sold` (integer)

### 401 — Unauthorized - Authentication required

### 403 — Forbidden - Insufficient permissions

### 422 — Validation Error

Schema: `HTTPValidationError`

- `detail` (array · ValidationError) → `ValidationError`
  - `loc` (array · string | integer · required)
  - `msg` (string · required)
  - `type` (string · required)
  - `input` (object)
  - `ctx` (object)

## Code samples

### cURL

```bash
curl -X GET 'https://api.ondayzero.com/api/v1/inventory/reports/margin-by-sku' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/inventory/reports/margin-by-sku', {
  method: 'GET',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
  },
});
const data = await response.json();
```

### Python

```python
import httpx

headers = {
    "Authorization": "Bearer dz_your_token",
    "x-business-id": "YOUR_BUSINESS_ID",
}

response = httpx.get("https://api.ondayzero.com/api/v1/inventory/reports/margin-by-sku", headers=headers)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/inventory-reports/get-margin-by-sku
- OpenAPI slice: https://www.ondayzero.com/docs/reference/inventory-reports/get-margin-by-sku/openapi.json
- Other endpoints in **inventory:reports**: https://www.ondayzero.com/docs/reference/inventory-reports