Salesforce Marketing Cloud Assets API

openapi: 3.1.0
info:
  title: Salesforce Marketing Cloud REST Assets API
  description: The Salesforce Marketing Cloud REST API provides programmatic access to Marketing Cloud features including contacts, journeys, and assets. The API uses JSON request and response bodies and OAuth 2.0 authentication via the Marketing Cloud authentication endpoint. All API requests require a valid access token obtained through the Server-to-Server OAuth flow.
  version: 1.0.0
  termsOfService: https://www.salesforce.com/company/legal/
  contact:
    name: Salesforce Marketing Cloud Support
    url: https://help.salesforce.com/s/
    email: support@salesforce.com
  license:
    name: Salesforce Master Subscription Agreement
    url: https://www.salesforce.com/company/legal/agreements/
servers:
- url: https://{subdomain}.rest.marketingcloudapis.com
  description: Marketing Cloud REST API endpoint
  variables:
    subdomain:
      default: YOUR_SUBDOMAIN
      description: Your Marketing Cloud tenant-specific subdomain (e.g., mc563885gzs27c5t9-63k636ttgm). Obtain this from Setup > Apps > Installed Packages in Marketing Cloud.
security:
- OAuth2: []
tags:
- name: Assets
  description: Manage marketing assets including images, documents, content blocks, and templates. The Asset API provides CRUD operations for all content types stored in Content Builder.
  externalDocs:
    description: Asset API Documentation
    url: https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/asset-api.html
paths:
  /asset/v1/content/assets:
    get:
      operationId: listAssets
      summary: Salesforce Marketing Cloud List Assets
      description: Retrieves a collection of assets from Content Builder. Supports filtering, sorting, and pagination. Assets include emails, templates, images, content blocks, and other content types.
      tags:
      - Assets
      parameters:
      - name: $page
        in: query
        description: Page number for pagination (1-based)
        schema:
          type: integer
          default: 1
          minimum: 1
      - name: $pageSize
        in: query
        description: Number of assets per page
        schema:
          type: integer
          default: 50
          minimum: 1
          maximum: 200
      - name: $orderBy
        in: query
        description: Field to sort results by (e.g., modifiedDate DESC, name ASC)
        schema:
          type: string
      - name: $filter
        in: query
        description: OData-style filter expression (e.g., assetType.name eq 'htmlemail')
        schema:
          type: string
      responses:
        '200':
          description: Assets retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AssetCollection'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    post:
      operationId: createAsset
      summary: Salesforce Marketing Cloud Create an Asset
      description: Creates a new asset in Content Builder. The asset type determines the required and optional fields. Common asset types include htmlemail, templatebasedemail, htmlblock, codesnippetblock, and image.
      tags:
      - Assets
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AssetDefinition'
            example:
              name: Welcome Email
              description: Welcome email sent to new subscribers
              assetType:
                name: htmlemail
                id: 208
              views:
                html:
                  content: <html><body><h1>Welcome!</h1></body></html>
                subjectLine:
                  content: Welcome to our newsletter
              data:
                email:
                  options:
                    characterEncoding: utf-8
      responses:
        '201':
          description: Asset created successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Asset'
        '400':
          description: Bad request - invalid asset definition
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /asset/v1/content/assets/{id}:
    get:
      operationId: getAsset
      summary: Salesforce Marketing Cloud Retrieve an Asset
      description: Retrieves a single asset by its unique identifier. Returns the complete asset definition including content, metadata, and associated category.
      tags:
      - Assets
      parameters:
      - name: id
        in: path
        required: true
        description: Unique identifier of the asset
        schema:
          type: integer
      responses:
        '200':
          description: Asset retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Asset'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Asset not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    put:
      operationId: updateAsset
      summary: Salesforce Marketing Cloud Update an Asset
      description: Updates an existing asset. Provide the complete asset definition with all desired values. Fields not included in the request body are not modified.
      tags:
      - Assets
      parameters:
      - name: id
        in: path
        required: true
        description: Unique identifier of the asset
        schema:
          type: integer
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AssetDefinition'
      responses:
        '200':
          description: Asset updated successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Asset'
        '400':
          description: Bad request - invalid asset definition
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Asset not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    delete:
      operationId: deleteAsset
      summary: Salesforce Marketing Cloud Delete an Asset
      description: Deletes an asset from Content Builder. This action is permanent and cannot be undone.
      tags:
      - Assets
      parameters:
      - name: id
        in: path
        required: true
        description: Unique identifier of the asset to delete
        schema:
          type: integer
      responses:
        '200':
          description: Asset deleted successfully
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: Asset not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /asset/v1/content/assets/query:
    post:
      operationId: queryAssets
      summary: Salesforce Marketing Cloud Query Assets With Advanced Filtering
      description: Performs an advanced query against assets using a structured query object. Supports complex filtering with AND/OR logic, nested conditions, and multiple sort criteria. More powerful than the OData-style filter on the list endpoint.
      tags:
      - Assets
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AssetQuery'
            example:
              page:
                page: 1
                pageSize: 50
              query:
                property: assetType.name
                simpleOperator: equal
                value: htmlemail
              sort:
              - property: modifiedDate
                direction: DESC
              fields:
              - id
              - name
              - assetType
              - modifiedDate
      responses:
        '200':
          description: Query results returned
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AssetCollection'
        '400':
          description: Bad request - invalid query
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /asset/v1/content/categories:
    get:
      operationId: listCategories
      summary: Salesforce Marketing Cloud List Asset Categories
      description: Retrieves categories (folders) used to organize assets in Content Builder. Categories provide a hierarchical folder structure for content organization.
      tags:
      - Assets
      parameters:
      - name: $page
        in: query
        description: Page number for pagination (1-based)
        schema:
          type: integer
          default: 1
      - name: $pageSize
        in: query
        description: Number of categories per page
        schema:
          type: integer
          default: 50
      - name: $filter
        in: query
        description: OData-style filter expression (e.g., parentId eq 12345)
        schema:
          type: string
      responses:
        '200':
          description: Categories retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CategoryCollection'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '429':
          description: Too many requests
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    AssetType:
      type: object
      description: Defines the type of an asset. Each type has a unique ID and name. Common types include htmlemail (208), templatebasedemail (207), htmlblock (197), codesnippetblock (220), and image (28).
      properties:
        id:
          type: integer
          description: Numeric identifier for the asset type
          example: abc123
        name:
          type: string
          description: Name of the asset type
          example: Example Title
    Asset:
      type: object
      description: Represents a marketing asset in Content Builder. Assets include emails, templates, images, content blocks, and other content types used in marketing campaigns.
      properties:
        id:
          type: integer
          description: System-generated unique identifier for the asset
          example: abc123
        customerKey:
          type: string
          description: Customer-defined unique key for the asset
          example: example_value
        name:
          type: string
          description: Display name of the asset
          example: Example Title
        description:
          type: string
          description: Description of the asset
          example: A sample description.
        assetType:
          $ref: '#/components/schemas/AssetType'
        category:
          type: object
          description: Category (folder) containing the asset
          properties:
            id:
              type: integer
            name:
              type: string
            parentId:
              type: integer
          example: example_value
        content:
          type: string
          description: Primary content of the asset, typically HTML or text depending on asset type
          example: example_value
        views:
          type: object
          description: Channel-specific content views (e.g., html, text, subjectLine, preheader)
          properties:
            html:
              type: object
              properties:
                content:
                  type: string
            text:
              type: object
              properties:
                content:
                  type: string
            subjectLine:
              type: object
              properties:
                content:
                  type: string
            preheader:
              type: object
              properties:
                content:
                  type: string
          example: example_value
        data:
          type: object
          description: Asset-type-specific data and configuration
          additionalProperties: true
          example: example_value
        tags:
          type: array
          description: Tags assigned to the asset for organization
          items:
            type: string
          example: []
        status:
          type: object
          properties:
            id:
              type: integer
            name:
              type: string
              enum:
              - Draft
              - Approved
          example: example_value
        createdDate:
          type: string
          format: date-time
          example: '2026-01-15T10:30:00Z'
        modifiedDate:
          type: string
          format: date-time
          example: '2026-01-15T10:30:00Z'
        createdBy:
          type: object
          properties:
            id:
              type: integer
            name:
              type: string
            email:
              type: string
          example: example_value
        modifiedBy:
          type: object
          properties:
            id:
              type: integer
            name:
              type: string
            email:
              type: string
          example: example_value
    AssetQuery:
      type: object
      description: Advanced query object for searching assets
      properties:
        page:
          type: object
          properties:
            page:
              type: integer
            pageSize:
              type: integer
          example: example_value
        query:
          type: object
          description: Query filter criteria
          properties:
            property:
              type: string
              description: Property name to filter on
            simpleOperator:
              type: string
              description: Comparison operator
              enum:
              - equal
              - notEqual
              - greaterThan
              - greaterThanOrEqual
              - lessThan
              - lessThanOrEqual
              - like
              - isNull
              - isNotNull
              - between
              - IN
            value:
              description: Value to compare against
            dateValue:
              type: string
              format: date-time
              description: Date value for date-based comparisons
            leftOperand:
              type: object
              description: Left operand for compound queries
            rightOperand:
              type: object
              description: Right operand for compound queries
            logicalOperator:
              type: string
              enum:
              - AND
              - OR
          example: example_value
        sort:
          type: array
          items:
            type: object
            properties:
              property:
                type: string
              direction:
                type: string
                enum:
                - ASC
                - DESC
          example: []
        fields:
          type: array
          description: Specific fields to include in the response
          items:
            type: string
          example: []
    AssetDefinition:
      type: object
      description: Specification for creating or updating an asset
      properties:
        name:
          type: string
          description: Display name of the asset
          example: Example Title
        description:
          type: string
          description: Description of the asset
          example: A sample description.
        customerKey:
          type: string
          description: Customer-defined unique key
          example: example_value
        assetType:
          $ref: '#/components/schemas/AssetType'
        category:
          type: object
          properties:
            id:
              type: integer
              description: ID of the category (folder) to place the asset in
          example: example_value
        content:
          type: string
          description: Primary content of the asset
          example: example_value
        views:
          type: object
          description: Channel-specific content views
          properties:
            html:
              type: object
              properties:
                content:
                  type: string
            text:
              type: object
              properties:
                content:
                  type: string
            subjectLine:
              type: object
              properties:
                content:
                  type: string
            preheader:
              type: object
              properties:
                content:
                  type: string
          example: example_value
        data:
          type: object
          description: Asset-type-specific data
          additionalProperties: true
          example: example_value
        tags:
          type: array
          items:
            type: string
          example: []
      required:
      - name
      - assetType
    ErrorResponse:
      type: object
      description: Standard error response returned by the Marketing Cloud API
      properties:
        message:
          type: string
          description: Human-readable error message
          example: example_value
        errorcode:
          type: integer
          description: Numeric error code
          example: 10
        documentation:
          type: string
          description: URL to relevant documentation for this error
          example: example_value
    CategoryCollection:
      type: object
      description: Paginated collection of asset categories
      properties:
        count:
          type: integer
          example: 10
        page:
          type: integer
          example: 10
        pageSize:
          type: integer
          example: 10
        items:
          type: array
          items:
            type: object
            properties:
              id:
                type: integer
              name:
                type: string
              parentId:
                type: integer
              description:
                type: string
          example: []
    AssetCollection:
      type: object
      description: Paginated collection of assets
      properties:
        count:
          type: integer
          description: Total number of assets matching the query
          example: 10
        page:
          type: integer
          description: Current page number
          example: 10
        pageSize:
          type: integer
          description: Number of items per page
          example: 10
        items:
          type: array
          items:
            $ref: '#/components/schemas/Asset'
          example: []
  securitySchemes:
    OAuth2:
      type: oauth2
      description: Marketing Cloud uses OAuth 2.0 client credentials flow for authentication. Obtain a client ID and secret from an installed package in Marketing Cloud Setup, then exchange them for an access token at the authentication endpoint.
      flows:
        clientCredentials:
          tokenUrl: https://YOUR_SUBDOMAIN.auth.marketingcloudapis.com/v2/token
          scopes: {}