> For the complete documentation index, see [llms.txt](https://docs-v2.bulkmail.shop/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-v2.bulkmail.shop/products/calculate-a-price.md).

# Calculate a price

What a quantity would cost you. Pack products accept only their allowed\_quantities.

```json
{"openapi":"3.1.0","info":{"title":"BulkMail API","version":"2.0"},"tags":[{"name":"Products","description":"The catalogue and prices. Public; send your key to see your own prices.\n\n| Method | Endpoint | What it does |\n|---|---|---|\n| `GET` | `/products` | List products |\n| `GET` | `/products/{id}` | Get a product |\n| `POST` | `/products/{id}/calculate-price` | Calculate a price |\n| `GET` | `/tabs` | List tabs (categories) |\n\n**Authentication:** Public (API key optional). Send your key in the `X-API-Key` header."}],"servers":[{"url":"https://bulkmail.shop/api/v2","description":"Production"}],"security":[{},{"ApiKeyAuth":[]},{"ApiKeyQuery":[]}],"components":{"securitySchemes":{"ApiKeyAuth":{"type":"apiKey","in":"header","name":"X-API-Key","description":"Your API key (sk_live_…)."},"ApiKeyQuery":{"type":"apiKey","in":"query","name":"api_key","description":"Same key as a query parameter. Prefer the header."}}},"paths":{"/products/{id}/calculate-price":{"post":{"tags":["Products"],"summary":"Calculate a price","operationId":"postProductsByIdCalculatePrice","description":"What a quantity would cost you. Pack products accept only their allowed_quantities.","parameters":[{"name":"id","in":"path","required":true,"schema":{"type":"integer"},"description":"Product id."}],"requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","properties":{"quantity":{"type":"integer","description":"1 or more; for pack products one of allowed_quantities."}},"required":["quantity"]}}}},"responses":{"200":{"description":"OK","content":{"application/json":{"schema":{"type":"object","properties":{"success":{"type":"boolean","description":"true when the request worked, false on any error."},"data":{"type":"object","properties":{"product_id":{"type":"integer","description":"Product id (see GET /products)."},"quantity":{"type":"integer","description":"Units to buy."},"base_price":{"type":"number","description":"List price in USD before any pricing rules."},"applied_price":{"type":"number","description":"Unit price you would pay, USD."},"total_amount":{"type":"number","description":"Amount charged, USD."},"discount_percentage":{"type":"integer","description":"Saving against base_price in percent. Left out when 0."},"user_discount_applied":{"type":"boolean","description":"Present (true) only when your account discount applies."},"user_discount_percent":{"type":"integer","description":"Your account discount in percent. Present only with user_discount_applied."},"price_before_user_discount":{"type":"number","description":"Unit price before your account discount. Present only with user_discount_applied."}},"required":["product_id","quantity","base_price","applied_price","total_amount"],"description":"The account line."}},"required":["success","data"]}}}},"400":{"description":"Bad request: Invalid pack size, Quantity 0","content":{"application/json":{"schema":{"type":"object","properties":{"success":{"type":"boolean","description":"true when the request worked, false on any error."},"error":{"type":"string","description":"What went wrong."},"errors":{"type":"object","properties":{"code":{"type":"string"},"allowed_quantities":{"type":"array","items":{"type":"integer"},"description":"Pack sizes you may order. null for normal products."}},"required":["code","allowed_quantities"],"description":"Details: field name to messages for validation errors; code and allowed_quantities for pack-size errors."}},"required":["success","error"]}}}}}}}}}
```


---

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