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

---
id: 22f4e28b-9ed0-499e-ac0c-1cc23b2f54d1
---

# Add memberships

> Add memberships to a specified list in your HubSpot account. This endpoint allows you to add multiple memberships to a list identified by the listId. It is useful for managing list memberships in bulk, ensuring that the specified records are included in the list.

export const ScopesList = ({scopes = [], description = "This API requires one of the following scopes:"}) => {
  if (!scopes || scopes.length === 0) {
    return null;
  }
  const sortedScopes = scopes.sort((a, b) => a.localeCompare(b));
  return <div>
      <div className="text-sm mb-2">{description}</div>
      <div>
        {sortedScopes.map((scope, index) => <div key={index}>
            <code>
              <span className="text-xs">{scope}</span>
            </code>
          </div>)}
      </div>
    </div>;
};

export const SupportedProducts = ({marketing, sales, service, cms, data, commerce, crm, marketingLevel, salesLevel, serviceLevel, cmsLevel, dataLevel, commerceLevel, crmLevel}) => {
  const translations = {
    description: "Requires one of the following products or higher.",
    productNames: {
      marketing: "Marketing Hub",
      sales: "Sales Hub",
      service: "Service Hub",
      cms: "Content Hub",
      data: "Data Hub",
      commerce: "Revenue Hub",
      crm: "Smart CRM"
    },
    tiers: {
      free: "Free",
      starter: "Starter",
      professional: "Professional",
      enterprise: "Enterprise"
    }
  };
  const translateTier = tier => {
    if (!tier) return '';
    const lowerTier = tier.toLowerCase();
    return translations.tiers[lowerTier] || tier;
  };
  const products = [{
    name: marketing ? translations.productNames.marketing : '',
    level: translateTier(marketingLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/MarketingHub.svg",
    alt: "Marketing Hub"
  }, {
    name: sales ? translations.productNames.sales : '',
    level: translateTier(salesLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/SalesHub.svg",
    alt: "Sales Hub"
  }, {
    name: service ? translations.productNames.service : '',
    level: translateTier(serviceLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/ServiceHub.svg",
    alt: "Service Hub"
  }, {
    name: cms ? translations.productNames.cms : '',
    level: translateTier(cmsLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/ContentHub.svg",
    alt: "Content Hub"
  }, {
    name: data ? translations.productNames.data : '',
    level: translateTier(dataLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/DataHub.svg",
    alt: "Data Hub"
  }, {
    name: commerce ? translations.productNames.commerce : '',
    level: translateTier(commerceLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base/subscription_key_icons/commerce_icon.svg",
    alt: "Revenue Hub"
  }, {
    name: crm ? translations.productNames.crm : '',
    level: translateTier(crmLevel),
    icon: "https://www.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/SmartCRM.svg",
    alt: "Smart CRM"
  }].filter(product => product.name && product.level);
  if (products.length === 0) return null;
  return <div>
      <div className="text-sm mb-2">{translations.description}</div>
      <div className={`grid ${products.length === 1 ? 'grid-cols-1' : 'grid-cols-2'} gap-1.5`}>
        {products.map((product, index) => <div key={index} style={{
    display: 'flex',
    alignItems: 'center'
  }}>
            <img src={product.icon} alt={product.alt} className="w-3.5 h-3.5 mr-1.5 mt-2.5 mb-2.5 flex-shrink-0 align-middle" />
            <span className="font-medium mr-1 text-sm">{product.name} -</span>
            <span className="text-sm">{product.level}</span>
          </div>)}
      </div>
    </div>;
};

<AccordionGroup>
  <Accordion title="Supported products" defaultOpen="true" icon="cubes">
    <SupportedProducts marketing={true} sales={true} service={true} cms={true} marketingLevel="FREE" salesLevel="FREE" serviceLevel="FREE" cmsLevel="FREE" />
  </Accordion>

  <Accordion title="Required Scopes" icon="key">
    <ScopesList
      scopes={[
  'cms.membership.access_groups.write',
  'crm.lists.read',
  'crm.lists.write'
]}
    />
  </Accordion>
</AccordionGroup>


## OpenAPI

````yaml specs/2026-09-beta/crm-lists-v2026-09-beta.json PUT /crm/lists/2026-09-beta/{listId}/memberships/add
openapi: 3.0.1
info:
  title: CRM Lists
  description: Basepom for all HubSpot Projects
  version: 2026-09-beta
  x-hubspot-product-tier-requirements:
    marketing: FREE
    sales: FREE
    service: FREE
    cms: FREE
    commerce: FREE
    crmHub: FREE
    dataHub: FREE
servers:
  - url: https://api.hubapi.com
security: []
tags:
  - name: Basic
  - name: Batch
  - name: Search
paths:
  /crm/lists/2026-09-beta/{listId}/memberships/add:
    put:
      tags:
        - Basic
      summary: Add memberships
      description: >-
        Add memberships to a specified list in your HubSpot account. This
        endpoint allows you to add multiple memberships to a list identified by
        the listId. It is useful for managing list memberships in bulk, ensuring
        that the specified records are included in the list.
      operationId: put-/crm/lists/2026-09-beta/{listId}/memberships/add
      parameters:
        - name: listId
          in: path
          description: >-
            The unique identifier of the list to which memberships will be
            added.
          required: true
          style: simple
          explode: false
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              type: array
              items:
                type: string
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MembershipsUpdateResponse'
        default:
          $ref: '#/components/responses/Error'
          description: ''
      security:
        - oauth2:
            - crm.lists.write
            - crm.segments.read
        - oauth2:
            - cms.membership.access_groups.write
            - crm.lists.read
        - oauth2:
            - crm.segments.read
            - crm.segments.write
        - oauth2:
            - crm.lists.read
            - crm.segments.write
        - oauth2:
            - crm.lists.read
            - crm.lists.write
        - oauth2:
            - cms.membership.access_groups.write
            - crm.segments.read
components:
  schemas:
    MembershipsUpdateResponse:
      required:
        - recordIdsMissing
        - recordIdsRemoved
        - recordsIdsAdded
      type: object
      properties:
        recordIdsMissing:
          type: array
          description: >-
            An array of strings representing the IDs of records that were not
            found or could not be processed during the update.
          items:
            type: string
        recordIdsRemoved:
          type: array
          description: >-
            An array of strings representing the IDs of records that were
            successfully removed from the list.
          items:
            type: string
        recordsIdsAdded:
          type: array
          description: >-
            An array of strings representing the IDs of records that were
            successfully added to the list.
          items:
            type: string
    Error:
      required:
        - category
        - correlationId
        - message
      type: object
      properties:
        category:
          type: string
          description: A string indicating the category of the error.
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: >-
            An object containing additional context about the error, represented
            as a map of key-value pairs.
          example: >-
            {invalidPropertyName=[propertyValue], missingScopes=[scope1,
            scope2]}
        correlationId:
          type: string
          description: >-
            A unique identifier for the error instance, used for tracking and
            debugging purposes.
          format: uuid
          example: aeb5f871-7f07-4993-9211-075dc63e7cbf
        errors:
          type: array
          description: >-
            An array of ErrorDetail objects, each providing additional
            information about specific errors that occurred.
          items:
            $ref: '#/components/schemas/ErrorDetail'
        links:
          type: object
          additionalProperties:
            type: string
          description: >-
            An object containing related links, represented as a map of link
            names to URLs.
        message:
          type: string
          description: A string that provides a human-readable description of the error.
          example: An error occurred
        subCategory:
          type: string
          description: >-
            An object representing a more specific classification of the error
            within its category.
      description: >-
        Represents an error response returned by the API when an operation
        fails. This component is used in various endpoints to provide detailed
        information about the error encountered.
      example:
        message: Invalid input (details will vary based on the error)
        correlationId: aeb5f871-7f07-4993-9211-075dc63e7cbf
        category: VALIDATION_ERROR
        links:
          knowledge-base: https://www.hubspot.com/products/service/knowledge-base
    ErrorDetail:
      required:
        - message
      type: object
      properties:
        code:
          type: string
          description: >-
            A string representing a specific error code that identifies the type
            of error.
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: >-
            An object containing additional context about the error, represented
            as a map of strings to arrays of strings, which can include specific
            parameters or values related to the error.
          example: '{missingScopes=[scope1, scope2]}'
        in:
          type: string
          description: >-
            A string indicating the location where the error occurred, such as
            'query', 'header', or 'body'.
        message:
          type: string
          description: A string containing a human-readable description of the error.
        subCategory:
          type: string
          description: >-
            An object providing additional categorization of the error, which
            may contain further details.
      description: >-
        Represents detailed information about an error that occurred in the API.
        This component is used to provide additional context and specifics about
        errors, typically as part of an error response.
  responses:
    Error:
      description: An error occurred.
      content:
        '*/*':
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    oauth2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://app.hubspot.com/oauth/authorize
          tokenUrl: https://api.hubapi.com/oauth/v1/token
          scopes:
            cms.membership.access_groups.write: ''
            crm.lists.read: ''
            crm.lists.write: ''
            crm.segments.read: ''
            crm.segments.write: ''

````