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OpenAPI Specification

openapi: 3.2.0
info:
  title: eusend Templates API
  version: 1.0.0
  summary: EU-native transactional and marketing email API.
  description: 'eusend sends transactional and marketing email from infrastructure that stays inside the European Union — processing, storage and delivery alike.


    **When to use this API.** Reach for eusend to send application email from server-side code: password resets, receipts, verification codes, notifications, and opt-in marketing broadcasts to a list you own. It is a good fit when GDPR or EU data residency is a requirement, when you are migrating off Resend, SendGrid, Mailgun, Postmark or SES, or when you need SMTP relay rather than an HTTP call. It is not a fit for inbox hosting, for reading a user’s mailbox, or for sending to purchased or scraped lists.


    **Getting started.** Create an account, verify a sending domain by publishing the DNS records the domain endpoints hand back, then `POST /emails`. A key prefixed `eu_test_` exercises the whole pipeline without delivering anything.


    **Authentication.** Every authenticated endpoint takes `Authorization: Bearer `. Keys are `eu_live_…` or `eu_test_…`, and carry either `full_access` or the send-only `sending_access` permission.


    **Errors.** Non-2xx responses are always `{ "error": string, "code": string }`. Branch on `code`; the list is enumerated on the `Error` schema.


    **Conventions.** Request bodies use snake_case and reject unknown properties. Response bodies use camelCase, except the pagination cursor and a handful of endpoints noted inline. List endpoints are cursor-paginated, newest first. Every response carries `X-Request-Id`.'
  termsOfService: https://eusend.dev/legal/terms
  contact:
    name: eusend support
    email: support@eusend.dev
    url: https://eusend.dev/support
  license:
    name: Proprietary
    url: https://eusend.dev/legal/terms
servers:
- url: https://api.eusend.dev
  description: Production
security:
- bearerAuth: []
tags:
- name: Templates
  description: Stored HTML bodies with variable placeholders.
paths:
  /templates:
    post:
      operationId: createTemplate
      summary: Create a template
      description: A stored HTML body with `{{variable}}` placeholders, referenced from a send by `template_id`.
      tags:
      - Templates
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateTemplateRequest'
      responses:
        '201':
          description: Created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Template'
        '400':
          description: The request body or query failed validation (`VALIDATION_ERROR`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Missing, malformed, or revoked API key (`UNAUTHORIZED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The key exists but may not reach this resource — a `sending_access` key outside the send paths, a test-mode key writing live state, or an account on hold (`FORBIDDEN`, `ACCOUNT_RESTRICTED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit exceeded (`RATE_LIMITED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Unexpected server error (`INTERNAL_ERROR`). Carries `request_id`.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    get:
      operationId: listTemplates
      summary: List templates
      description: Newest first. Bodies are omitted; fetch one template to get its HTML.
      tags:
      - Templates
      responses:
        '200':
          description: The templates.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListTemplatesResponse'
        '401':
          description: Missing, malformed, or revoked API key (`UNAUTHORIZED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The key exists but may not reach this resource — a `sending_access` key outside the send paths, a test-mode key writing live state, or an account on hold (`FORBIDDEN`, `ACCOUNT_RESTRICTED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit exceeded (`RATE_LIMITED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Unexpected server error (`INTERNAL_ERROR`). Carries `request_id`.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /templates/{id}:
    get:
      operationId: getTemplate
      summary: Get a template
      description: The template including its HTML body.
      tags:
      - Templates
      parameters:
      - name: id
        in: path
        required: true
        description: The template id.
        schema:
          type: string
          format: uuid
      responses:
        '200':
          description: The template.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Template'
        '401':
          description: Missing, malformed, or revoked API key (`UNAUTHORIZED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The key exists but may not reach this resource — a `sending_access` key outside the send paths, a test-mode key writing live state, or an account on hold (`FORBIDDEN`, `ACCOUNT_RESTRICTED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: No such resource on this organization (`NOT_FOUND`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit exceeded (`RATE_LIMITED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Unexpected server error (`INTERNAL_ERROR`). Carries `request_id`.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    patch:
      operationId: updateTemplate
      summary: Update a template
      description: Only the fields present in the body are changed.
      tags:
      - Templates
      parameters:
      - name: id
        in: path
        required: true
        description: The template id.
        schema:
          type: string
          format: uuid
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdateTemplateRequest'
      responses:
        '200':
          description: Updated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Template'
        '400':
          description: The request body or query failed validation (`VALIDATION_ERROR`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Missing, malformed, or revoked API key (`UNAUTHORIZED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The key exists but may not reach this resource — a `sending_access` key outside the send paths, a test-mode key writing live state, or an account on hold (`FORBIDDEN`, `ACCOUNT_RESTRICTED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: No such resource on this organization (`NOT_FOUND`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit exceeded (`RATE_LIMITED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Unexpected server error (`INTERNAL_ERROR`). Carries `request_id`.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
    delete:
      operationId: deleteTemplate
      summary: Delete a template
      description: Emails already sent from it are unaffected.
      tags:
      - Templates
      parameters:
      - name: id
        in: path
        required: true
        description: The template id.
        schema:
          type: string
          format: uuid
      responses:
        '200':
          description: Deleted.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EmptyResponse'
        '401':
          description: Missing, malformed, or revoked API key (`UNAUTHORIZED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The key exists but may not reach this resource — a `sending_access` key outside the send paths, a test-mode key writing live state, or an account on hold (`FORBIDDEN`, `ACCOUNT_RESTRICTED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: No such resource on this organization (`NOT_FOUND`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit exceeded (`RATE_LIMITED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Unexpected server error (`INTERNAL_ERROR`). Carries `request_id`.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /templates/{id}/preview:
    get:
      operationId: previewTemplate
      summary: Render a template preview
      description: Returns the rendered HTML with the supplied variables substituted. Useful for checking a template before sending.
      tags:
      - Templates
      parameters:
      - name: id
        in: path
        required: true
        description: The template id.
        schema:
          type: string
          format: uuid
      - name: variables
        in: query
        description: A JSON object of substitution values, URL-encoded.
        schema:
          type: string
      responses:
        '200':
          description: The rendered HTML.
          content:
            text/html:
              schema:
                type: string
        '400':
          description: The request body or query failed validation (`VALIDATION_ERROR`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Missing, malformed, or revoked API key (`UNAUTHORIZED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: No such resource on this organization (`NOT_FOUND`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '422':
          description: The template has no HTML body, or rendering failed (`VALIDATION_ERROR`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit exceeded (`RATE_LIMITED`).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Unexpected server error (`INTERNAL_ERROR`). Carries `request_id`.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Error:
      type: object
      description: Every non-2xx response from the API has this shape. `code` is stable and safe to branch on; `error` is a human sentence that may change.
      required:
      - error
      - code
      properties:
        error:
          type: string
          description: Human-readable explanation of the failure.
        code:
          type: string
          enum:
          - UNAUTHORIZED
          - FORBIDDEN
          - NOT_FOUND
          - VALIDATION_ERROR
          - RATE_LIMITED
          - MONTHLY_LIMIT_EXCEEDED
          - DAILY_LIMIT_EXCEEDED
          - PLAN_LIMIT_EXCEEDED
          - ALL_SUPPRESSED
          - RECIPIENT_DOMAIN_UNDELIVERABLE
          - DOMAIN_NOT_VERIFIED
          - SENDING_SUSPENDED
          - ACCOUNT_RESTRICTED
          - WORKSPACE_INACTIVE
          - SENDER_NOT_PERMITTED
          - SERVICE_PAUSED
          - LIST_SEND_HELD
          - BROADCAST_HELD
          - ATTACHMENT_STORAGE_ERROR
          - INTERNAL_ERROR
          - CONFLICT
          - BAD_REQUEST
          - PAYLOAD_TOO_LARGE
          description: Stable machine-readable error code.
        request_id:
          type: string
          description: Correlation id, returned on 500s and echoed in the `X-Request-Id` header on every response. Quote it in support requests.
    EmptyResponse:
      type: object
      description: An empty object. The resource is gone.
      additionalProperties: false
    CreateTemplateRequest:
      type: object
      required:
      - name
      - subject
      - html
      additionalProperties: false
      properties:
        name:
          type: string
          minLength: 1
          maxLength: 100
        subject:
          type: string
          minLength: 1
        html:
          type: string
          minLength: 1
          description: May contain `{{variable}}` placeholders.
        editor_json:
          type:
          - object
          - 'null'
          additionalProperties: true
          description: Dashboard editor document, stored alongside the HTML so the visual editor can reopen it.
    TemplateListItem:
      type: object
      required:
      - id
      - name
      - subject
      - createdAt
      properties:
        id:
          type: string
          format: uuid
        name:
          type: string
        subject:
          type: string
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type:
          - string
          - 'null'
          format: date-time
    Template:
      type: object
      required:
      - id
      - name
      - subject
      - createdAt
      properties:
        id:
          type: string
          format: uuid
        name:
          type: string
        subject:
          type: string
        html:
          type:
          - string
          - 'null'
        reactSource:
          type:
          - string
          - 'null'
          description: Legacy field; no longer written.
        editorJson:
          type:
          - object
          - 'null'
          additionalProperties: true
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type:
          - string
          - 'null'
          format: date-time
    UpdateTemplateRequest:
      type: object
      additionalProperties: false
      properties:
        name:
          type: string
          minLength: 1
          maxLength: 100
        subject:
          type: string
          minLength: 1
        html:
          type: string
          minLength: 1
        editor_json:
          type:
          - object
          - 'null'
          additionalProperties: true
    ListTemplatesResponse:
      type: object
      required:
      - data
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/TemplateListItem'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'An eusend API key, sent as `Authorization: Bearer eu_live_…`. Create one in the dashboard under API keys.'
externalDocs:
  description: eusend documentation
  url: https://eusend.dev/docs