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

> ## Agent Instructions
> Treat docs/openapi.yaml as the normative public API contract.
> Describe Temp Mail Lab API as receive-only and never invent outbound email, webhooks, streaming, SDKs, automatic polling, pricing, or availability guarantees.
> Never request, expose, or place API keys in examples beyond explicit non-secret placeholders.

# List available domains

> Returns domains visible to the authenticated account. This is a one-shot
request and does not trigger background refreshes. A successful response,
a 304 response, and an authenticated processed 400/404 response consume
one request; 401, 403, 429, server errors, and health/internal traffic do
not consume the monthly request allowance.




## OpenAPI

````yaml /docs/openapi.yaml get /v1/domains
openapi: 3.1.0
info:
  title: Temp Mail Lab API
  version: 0.1.0-draft
  summary: Receive-only temporary email API for Temp Mail Lab Premium customers.
  description: |
    Create isolated temporary email addresses and retrieve messages, raw RFC 822
    source, and attachments. This contract is a pre-launch draft.

    The API never sends email and never performs automatic polling. A client
    decides when to make each request, and every processed request follows the
    documented usage policy.
  contact:
    name: Temp Mail Lab
    url: https://tempmaillab.com
  license:
    name: Temp Mail Lab Terms of Service
    url: https://tempmaillab.com/terms
servers:
  - url: https://api.tempmaillab.com
    description: Production (available only after the approved public launch)
security:
  - bearerAuth: []
tags:
  - name: Domains
    description: Discover domains that can create and receive API email.
  - name: Emails
    description: Create and inspect isolated temporary email reservations.
  - name: Messages
    description: List and retrieve received messages and their private content.
  - name: Usage
    description: Inspect the authenticated account's current request allowance.
paths:
  /v1/domains:
    get:
      tags:
        - Domains
      summary: List available domains
      description: >
        Returns domains visible to the authenticated account. This is a one-shot

        request and does not trigger background refreshes. A successful
        response,

        a 304 response, and an authenticated processed 400/404 response consume

        one request; 401, 403, 429, server errors, and health/internal traffic
        do

        not consume the monthly request allowance.
      operationId: listDomains
      parameters:
        - $ref: '#/components/parameters/Limit'
        - $ref: '#/components/parameters/Cursor'
        - $ref: '#/components/parameters/IfNoneMatch'
      responses:
        '200':
          description: Visible domains.
          headers:
            X-Request-Id:
              $ref: '#/components/headers/RequestId'
            RateLimit-Limit:
              $ref: '#/components/headers/RateLimitLimit'
            RateLimit-Remaining:
              $ref: '#/components/headers/RateLimitRemaining'
            RateLimit-Reset:
              $ref: '#/components/headers/RateLimitReset'
            ETag:
              $ref: '#/components/headers/ETag'
            Cache-Control:
              $ref: '#/components/headers/PrivateNoStore'
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DomainList'
              examples:
                domains:
                  value:
                    data:
                      - id: dom_2x8k9m4n6p
                        name: mail.example.com
                        tier: public
                        status: active
                        creation_enabled: true
                        receiving_enabled: true
                    pagination:
                      has_more: false
                      next_cursor: null
        '304':
          $ref: '#/components/responses/NotModifiedCharged'
        '400':
          $ref: '#/components/responses/BadRequestCharged'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/RateLimited'
        '500':
          $ref: '#/components/responses/ServerError'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
components:
  parameters:
    Limit:
      name: limit
      in: query
      required: false
      description: Maximum number of resources to return.
      schema:
        type: integer
        minimum: 1
        maximum: 100
        default: 50
    Cursor:
      name: cursor
      in: query
      required: false
      description: >-
        Opaque cursor returned by the previous page. Do not construct or modify
        it.
      schema:
        type: string
        minLength: 1
        maxLength: 512
    IfNoneMatch:
      name: If-None-Match
      in: header
      required: false
      description: Return 304 when the current representation matches this entity tag.
      schema:
        type: string
  headers:
    RequestId:
      description: Opaque request identifier for support and audit correlation.
      required: true
      schema:
        type: string
        pattern: ^req_[A-Za-z0-9_-]{16,80}$
    RateLimitLimit:
      description: >-
        Current authoritative request allowance visible to this key. Separate
        short-window safety limits may reject bursts with 429.
      required: true
      schema:
        type: integer
        minimum: 0
    RateLimitRemaining:
      description: Requests remaining in the current authoritative allowance window.
      required: true
      schema:
        type: integer
        minimum: 0
    RateLimitReset:
      description: >-
        UTC Unix timestamp when the current authoritative allowance window
        resets.
      required: true
      schema:
        type: integer
        minimum: 0
    ETag:
      description: Entity tag for a conditional one-shot read.
      required: true
      schema:
        type: string
    PrivateNoStore:
      description: Sensitive API responses must not be stored by shared or browser caches.
      required: true
      schema:
        type: string
        const: private, no-store
    RetryAfter:
      description: Seconds until the client may retry.
      required: true
      schema:
        type: integer
        minimum: 1
  schemas:
    DomainList:
      type: object
      additionalProperties: false
      required:
        - data
        - pagination
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/Domain'
        pagination:
          $ref: '#/components/schemas/Pagination'
    Domain:
      type: object
      additionalProperties: false
      required:
        - id
        - name
        - tier
        - status
        - creation_enabled
        - receiving_enabled
      properties:
        id:
          type: string
          pattern: ^dom_[A-Za-z0-9_-]{10,64}$
        name:
          type: string
          format: hostname
        tier:
          type: string
          enum:
            - public
            - premium
        status:
          type: string
          enum:
            - active
            - inactive
        creation_enabled:
          type: boolean
        receiving_enabled:
          type: boolean
    Pagination:
      type: object
      additionalProperties: false
      required:
        - has_more
        - next_cursor
      properties:
        has_more:
          type: boolean
        next_cursor:
          type:
            - string
            - 'null'
    ErrorResponse:
      type: object
      additionalProperties: false
      required:
        - error
      properties:
        error:
          $ref: '#/components/schemas/ErrorObject'
    ErrorObject:
      type: object
      additionalProperties: false
      required:
        - code
        - message
        - request_id
      properties:
        code:
          type: string
          pattern: ^[a-z][a-z0-9_]{2,63}$
        message:
          type: string
        request_id:
          type: string
        details:
          type: array
          items:
            $ref: '#/components/schemas/ErrorDetail'
    ErrorDetail:
      type: object
      additionalProperties: false
      required:
        - reason
      properties:
        field:
          type: string
        reason:
          type: string
  responses:
    NotModifiedCharged:
      description: Representation has not changed. This authenticated request is charged.
      headers:
        X-Request-Id:
          $ref: '#/components/headers/RequestId'
        RateLimit-Limit:
          $ref: '#/components/headers/RateLimitLimit'
        RateLimit-Remaining:
          $ref: '#/components/headers/RateLimitRemaining'
        RateLimit-Reset:
          $ref: '#/components/headers/RateLimitReset'
        ETag:
          $ref: '#/components/headers/ETag'
        Cache-Control:
          $ref: '#/components/headers/PrivateNoStore'
    BadRequestCharged:
      description: >-
        Authenticated request could not be processed because its syntax or
        parameters are invalid. Charged.
      headers:
        X-Request-Id:
          $ref: '#/components/headers/RequestId'
        RateLimit-Limit:
          $ref: '#/components/headers/RateLimitLimit'
        RateLimit-Remaining:
          $ref: '#/components/headers/RateLimitRemaining'
        RateLimit-Reset:
          $ref: '#/components/headers/RateLimitReset'
        Cache-Control:
          $ref: '#/components/headers/PrivateNoStore'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          examples:
            invalidCursor:
              value:
                error:
                  code: invalid_request
                  message: The request parameters are invalid.
                  request_id: req_a1b2c3d4e5f6g7h8
                  details:
                    - field: cursor
                      reason: invalid
    Unauthorized:
      description: >-
        Missing, malformed, revoked, or environment-invalid API key. Not
        charged.
      headers:
        X-Request-Id:
          $ref: '#/components/headers/RequestId'
        Cache-Control:
          $ref: '#/components/headers/PrivateNoStore'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          examples:
            invalidKey:
              value:
                error:
                  code: invalid_api_key
                  message: A valid API key is required.
                  request_id: req_a1b2c3d4e5f6g7h8
    Forbidden:
      description: >-
        Authenticated account is not entitled to the requested operation. Not
        charged.
      headers:
        X-Request-Id:
          $ref: '#/components/headers/RequestId'
        Cache-Control:
          $ref: '#/components/headers/PrivateNoStore'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    RateLimited:
      description: >-
        A short-window safety or authoritative quota limit was reached. Not
        charged.
      headers:
        X-Request-Id:
          $ref: '#/components/headers/RequestId'
        RateLimit-Limit:
          $ref: '#/components/headers/RateLimitLimit'
        RateLimit-Remaining:
          $ref: '#/components/headers/RateLimitRemaining'
        RateLimit-Reset:
          $ref: '#/components/headers/RateLimitReset'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        Cache-Control:
          $ref: '#/components/headers/PrivateNoStore'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
          examples:
            rateLimited:
              value:
                error:
                  code: rate_limit_exceeded
                  message: Too many requests. Retry after the indicated delay.
                  request_id: req_a1b2c3d4e5f6g7h8
    ServerError:
      description: >-
        The service failed before completing the operation. Not charged; never
        represented as an empty success.
      headers:
        X-Request-Id:
          $ref: '#/components/headers/RequestId'
        Cache-Control:
          $ref: '#/components/headers/PrivateNoStore'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    ServiceUnavailable:
      description: >-
        A required isolated API dependency is temporarily unavailable. Not
        charged.
      headers:
        X-Request-Id:
          $ref: '#/components/headers/RequestId'
        Retry-After:
          $ref: '#/components/headers/RetryAfter'
        Cache-Control:
          $ref: '#/components/headers/PrivateNoStore'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: tml_live_...
      description: >
        Send a live API key in the Authorization header. Keys in query strings
        are

        rejected. A staging key never authenticates against production.

````