> ## Documentation Index
> Fetch the complete documentation index at: https://docs.omnicommerce.sg/llms.txt
> Use this file to discover all available pages before exploring further.

# Update Product Cost

> Set catalog cost for one simple product or variant UUID. Cost is Omni-only and never syncs to marketplaces. Prefer `POST /api/v1/products/cost` for Windmill or other bulk jobs.

Requires `catalog:write`. When `costPriceCurrency` differs from the product selling currency and `costPriceFxRate` is omitted, Omni stores an FX quote on the product.



## OpenAPI

````yaml /openapi.json patch /api/v1/products/{productId}/cost
openapi: 3.1.0
info:
  title: OmniCommerce API
  version: 1.0.0
  license:
    name: Proprietary
    url: https://omnicommerce.sg/terms
  description: >-
    OmniCommerce API surface for agents and developer integrations. Includes
    public endpoints (merchant discovery, product search, compare, catalog, ACO
    retrieval) and authenticated endpoints (product management via API key
    Bearer tokens).
servers:
  - url: https://omnicommerce.sg
    description: Production
  - url: http://localhost:3000
    description: Local development
security: []
tags:
  - name: agentic-checkout
    description: Merchant-fulfilled agentic checkout
    x-group: Agentic Checkout
  - name: aops
    description: Agent operating procedures
    x-group: AOPs
  - name: commerce
    description: Root commerce discovery
    x-group: Commerce
  - name: developer-platform
    description: Authenticated developer platform APIs
    x-group: Developer Platform
  - name: looks
    description: AI-styled product looks
    x-group: Looks
  - name: oauth
    description: OAuth token endpoints
    x-group: OAuth
  - name: orders
    description: Workspace and agentic orders
    x-group: Orders
  - name: organizations
    description: Organization management
    x-group: Organizations
  - name: price-books
    description: Marketplace list-price markup rules
    x-group: Price Books
  - name: products
    description: Product CRUD, bulk import, and publish
    x-group: Products
  - name: promotions
    description: Central promotions and marketplace sync
    x-group: Promotions
  - name: public-agent
    description: Public agent discovery and catalog APIs
    x-group: Public Agent
  - name: returns
    description: returns
    x-group: Returns
  - name: settlements
    description: settlements
    x-group: Settlements
  - name: ucp
    description: Universal Commerce Protocol
    x-group: UCP
paths:
  /api/v1/products/{productId}/cost:
    patch:
      tags:
        - products
      summary: Update Product Cost
      description: >-
        Set catalog cost for one simple product or variant UUID. Cost is
        Omni-only and never syncs to marketplaces. Prefer `POST
        /api/v1/products/cost` for Windmill or other bulk jobs.


        Requires `catalog:write`. When `costPriceCurrency` differs from the
        product selling currency and `costPriceFxRate` is omitted, Omni stores
        an FX quote on the product.
      operationId: patch_v1_products_by_productid_cost
      parameters:
        - name: productId
          in: path
          required: true
          description: OmniCommerce simple-product or variant UUID.
          schema:
            type: string
            format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties: false
              required:
                - costPrice
              properties:
                costPrice:
                  type:
                    - number
                    - 'null'
                  minimum: 0
                costPriceCurrency:
                  type: string
                  pattern: ^[A-Za-z]{3}$
                costPriceFxRate:
                  type: number
                  exclusiveMinimum: 0
                costPriceFxTo:
                  type: string
                  pattern: ^[A-Za-z]{3}$
                costPriceFxAsOf:
                  type: string
            example:
              costPrice: 578
              costPriceCurrency: USD
      responses:
        '200':
          description: Catalog cost updated.
        '400':
          description: Invalid cost payload.
        '401':
          description: Unauthorized
        '403':
          description: Credential lacks catalog:write or organization is inactive.
        '404':
          description: Product or variant not found.
        '500':
          description: Internal Server Error
      security:
        - bearerAuth: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: API Key
      description: >-
        Bearer API key for server-to-server access. Session auth is also
        supported in first-party UI flows.

````