openapi: 3.0.1
info:
  title: HubSpot Marketing Single Send
  description: Basepom for all HubSpot Projects
  version: 2026-09
  x-hubspot-product-tier-requirements:
    marketing: ENTERPRISE
    sales: FREE
    service: FREE
    cms: FREE
    commerce: FREE
    crmHub: FREE
    dataHub: FREE
  x-hubspot-api-use-case: 'Any marketing emails sent through the single-send API will automatically be
    associated with contact records based on their email address, and update non-marketing contacts and
    set them to marketing contacts . '
  x-hubspot-introduction: The single-send API allows you to send template emails created in the HubSpot
    marketing email tool using a JSON-formatted POST request.
servers:
- url: https://api.hubapi.com
tags:
- name: Advanced
paths:
  /marketing/email-campaigns/2026-09/single-send:
    post:
      tags:
      - Advanced
      summary: Send an email
      description: Send a template email to a specific recipient.
      operationId: post-/marketing/email-campaigns/2026-09/single-send_/marketing/v4/email/single-send
      parameters: []
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PublicSingleSendRequestEgg'
        required: true
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EmailSendStatusView'
        default:
          description: ''
          $ref: '#/components/responses/Error'
      security:
      - oauth2:
        - transactional-email
      - oauth2:
        - marketing-email
      x-hubspot-rate-limit-exemptions:
      - daily
      - ten-secondly
components:
  schemas:
    EmailSendStatusView:
      required:
      - status
      - statusId
      type: object
      properties:
        completedAt:
          type: string
          description: Time when the send was completed.
          format: date-time
        eventId:
          $ref: '#/components/schemas/EventIdView'
        message:
          type: string
          description: A human readable message describing the error along with remediation steps where
            appropriate
        requestedAt:
          type: string
          description: Time when the send was requested.
          format: date-time
        sendResult:
          type: string
          description: Result of the send.
          enum:
          - ADDRESS_LIST_BOMBED
          - ADDRESS_ONLY_ACCEPTED_ON_PROD
          - ADDRESS_OPTED_OUT
          - ATTACHMENT_DOWNLOAD_QUEUE_FULL
          - BLOCKED_ADDRESS
          - BLOCKED_DOMAIN
          - BRAND_RECIPIENT_FATIGUE_SUPPRESSED
          - CAMPAIGN_CANCELLED
          - CANCELLED_ABUSE
          - CONTACT_VIEW_PERMISSION
          - CORRUPT_INPUT
          - EMAIL_DISABLED
          - EMAIL_UNCONFIRMED
          - GDPR_DOI_ENABLED
          - GRAYMAIL_SUPPRESSED
          - HUBL_LIMIT_EXCEEDED
          - IDEMPOTENT_FAIL
          - IDEMPOTENT_IGNORE
          - INVALID_APP_ID_ATTRIBUTION
          - INVALID_FROM_ADDRESS
          - INVALID_TO_ADDRESS
          - LOW_CONTACT_QUALITY_SCORE
          - MARKETING_ACTIVATION_DISALLOWED
          - MISSING_CONTENT
          - MISSING_REQUIRED_PARAMETER
          - MISSING_TEMPLATE_PROPERTIES
          - MTA_IGNORE
          - NON_MARKETABLE_CONTACT
          - PORTAL_AUTHENTICATION_FAILURE
          - PORTAL_EXPIRED
          - PORTAL_MISSING_MARKETING_SCOPE
          - PORTAL_NOT_AUTHORIZED_FOR_APPLICATION
          - PORTAL_OVER_LIMIT
          - PORTAL_SUSPENDED
          - PREVIOUS_SPAM
          - PREVIOUSLY_BOUNCED
          - PREVIOUSLY_UNSUBSCRIBED_BRAND
          - PREVIOUSLY_UNSUBSCRIBED_BUSINESS_UNIT
          - PREVIOUSLY_UNSUBSCRIBED_MESSAGE
          - PREVIOUSLY_UNSUBSCRIBED_PORTAL
          - QUARANTINED_ADDRESS
          - QUEUED
          - RECIPIENT_FATIGUE_SUPPRESSED
          - SENT
          - TEMPLATE_RENDER_EXCEPTION
          - THROTTLED
          - TOO_MANY_RECIPIENTS
          - UBB_GOVERNANCE_MISSING
          - UNCONFIGURED_SENDING_DOMAIN
          - UNDELIVERABLE
          - VALIDATION_FAILED
        startedAt:
          type: string
          description: Time when the send began processing.
          format: date-time
        status:
          type: string
          description: Status of the send request.
          enum:
          - CANCELED
          - COMPLETE
          - PENDING
          - PROCESSING
        statusId:
          type: string
          description: Identifier used to query the status of the send.
    Error:
      required:
      - category
      - correlationId
      - message
      type: object
      properties:
        category:
          type: string
          description: The error category
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: Context about the error condition
          example: '{invalidPropertyName=[propertyValue], missingScopes=[scope1, scope2]}'
        correlationId:
          type: string
          description: A unique identifier for the request. Include this value with any error reports
            or support tickets
          format: uuid
          example: aeb5f871-7f07-4993-9211-075dc63e7cbf
        errors:
          type: array
          description: further information about the error
          items:
            $ref: '#/components/schemas/ErrorDetail'
        links:
          type: object
          additionalProperties:
            type: string
          description: A map of link names to associated URIs containing documentation about the error
            or recommended remediation steps
        message:
          type: string
          description: A human readable message describing the error along with remediation steps where
            appropriate
          example: An error occurred
        subCategory:
          type: string
          description: A specific category that contains more specific detail about the error
      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: The status code associated with the error detail
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: Context about the error condition
          example: '{missingScopes=[scope1, scope2]}'
        in:
          type: string
          description: The name of the field or parameter in which the error was found.
        message:
          type: string
          description: A human readable message describing the error along with remediation steps where
            appropriate
        subCategory:
          type: string
          description: A specific category that contains more specific detail about the error
      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.
    EventIdView:
      required:
      - created
      - id
      type: object
      properties:
        created:
          type: string
          description: Time of event creation.
          format: date-time
        id:
          type: string
          description: Identifier of event.
          format: uuid
    PublicSingleSendEmail:
      required:
      - bcc
      - cc
      - replyTo
      type: object
      properties:
        bcc:
          type: array
          description: List of email addresses to send as Bcc.
          items:
            type: string
        cc:
          type: array
          description: List of email addresses to send as Cc.
          items:
            type: string
        from:
          type: string
          description: The From header for the email.
        replyTo:
          type: array
          description: List of Reply-To header values for the email.
          items:
            type: string
        sendId:
          type: string
          description: ID for a particular send. No more than one email will be sent per sendId.
        to:
          type: string
          description: The recipient of the email.
    PublicSingleSendRequestEgg:
      required:
      - contactProperties
      - customProperties
      - emailId
      - message
      type: object
      properties:
        contactProperties:
          type: object
          additionalProperties:
            type: string
          description: The contactProperties field is a map of contact property values. Each contact property
            value contains a name and value property. Each property will get set on the contact record
            and will be visible in the template under {{ contact.NAME }}. Use these properties when you
            want to set a contact property while you’re sending the email. For example, when sending a
            receipt you may want to set a last_paid_date property, as the sending of the receipt will
            have information about the last payment.
        customProperties:
          type: object
          additionalProperties:
            type: object
            properties: {}
          description: 'The customProperties field is a map of property values. Each property value contains
            a name and value property. Each property will be visible in the template under {{ custom.NAME
            }}.

            Note: Custom properties do not currently support arrays. To provide a listing in an email,
            one workaround is to build an HTML list (either with tables or ul) and specify it as a custom
            property.'
        emailId:
          type: integer
          description: The content ID for the email, which can be found in email tool UI.
          format: int64
        message:
          $ref: '#/components/schemas/PublicSingleSendEmail'
  responses:
    Error:
      description: An error occurred.
      content:
        '*/*':
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    developer_hapikey:
      type: apiKey
      name: hapikey
      in: query
    oauth2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://app.hubspot.com/oauth/authorize
          tokenUrl: https://api.hubapi.com/oauth/v1/token
          scopes:
            transactional-email: ''
    private_apps:
      type: apiKey
      name: private-app
      in: header
    private_apps_legacy:
      type: apiKey
      name: private-app-legacy
      in: header
x-hubspot-product-tier-requirements:
  marketing: ENTERPRISE
  sales: FREE
  service: FREE
  cms: FREE
  commerce: FREE
  crmHub: FREE
  dataHub: FREE