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OpenAPI Specification

openapi: 3.2.0
info:
  title: Moondream Cloud OpenAI Compatibility Skills API
  version: '1.0'
  description: Moondream is a fast, efficient open vision language model (VLM). The Moondream Cloud API exposes the model's "Skills" — Query (visual question answering), Caption, Detect (object detection with bounding boxes), Point (object center coordinates), and Segment (SVG path masks) — plus an OpenAI-compatible chat endpoint. Endpoints, request bodies, and responses in this specification are modeled faithfully from the published Moondream documentation (https://docs.moondream.ai). This is an API Evangelist generated spec; Moondream does not publish an OpenAPI document.
  contact:
    name: Moondream (M87 Labs)
    url: https://moondream.ai
    email: sales@moondream.ai
  license:
    name: Business Source License 1.1
    url: https://github.com/m87-labs/moondream/blob/main/LICENSE
  x-apievangelist-generated: true
  x-source-docs: https://docs.moondream.ai/api
servers:
- url: https://api.moondream.ai/v1
  description: Moondream Cloud
security:
- MoondreamAuth: []
tags:
- name: Skills
  description: Moondream vision Skills — query, caption, detect, point, segment.
paths:
  /query:
    post:
      tags:
      - Skills
      operationId: query
      summary: Visual question answering
      description: Ask a natural-language question about an image and receive an answer. Supports streaming.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/QueryRequest'
      responses:
        '200':
          description: Answer to the question.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QueryResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
        '400':
          $ref: '#/components/responses/BadRequest'
  /caption:
    post:
      tags:
      - Skills
      operationId: caption
      summary: Image captioning
      description: Generate a natural-language description of an image. Supports streaming and a length hint.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CaptionRequest'
      responses:
        '200':
          description: Generated caption.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CaptionResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
        '400':
          $ref: '#/components/responses/BadRequest'
  /detect:
    post:
      tags:
      - Skills
      operationId: detect
      summary: Object detection
      description: Identify and locate objects in an image, returning normalized bounding boxes.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DetectRequest'
      responses:
        '200':
          description: Detected objects with bounding boxes.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DetectResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
        '400':
          $ref: '#/components/responses/BadRequest'
  /point:
    post:
      tags:
      - Skills
      operationId: point
      summary: Object pointing
      description: Get precise normalized center coordinates for objects in an image.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DetectRequest'
      responses:
        '200':
          description: Center points for the requested object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PointResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
        '400':
          $ref: '#/components/responses/BadRequest'
  /segment:
    post:
      tags:
      - Skills
      operationId: segment
      summary: Image segmentation
      description: Generate an SVG path segmentation mask for an object in an image.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DetectRequest'
      responses:
        '200':
          description: SVG path mask and bounding box for the object.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SegmentResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
        '400':
          $ref: '#/components/responses/BadRequest'
components:
  schemas:
    ModelId:
      type: string
      description: Model selection. A base model ID or a saved finetune checkpoint in {base_model}/{finetune_id}@{step} form.
      examples:
      - moondream3.1-9B-A2B
      - moondream3-preview
    DetectResponse:
      type: object
      properties:
        request_id:
          type: string
        objects:
          type: array
          items:
            $ref: '#/components/schemas/BoundingBox'
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            message:
              type: string
            type:
              type: string
    Point:
      type: object
      description: Normalized center coordinate (0..1).
      properties:
        x:
          type: number
        y:
          type: number
    QueryRequest:
      type: object
      required:
      - model
      - image_url
      - question
      properties:
        model:
          $ref: '#/components/schemas/ModelId'
        image_url:
          $ref: '#/components/schemas/ImageInput'
        question:
          type: string
          description: Natural-language question about the image.
        stream:
          type: boolean
          default: false
          description: Stream the answer token-by-token as server-sent events.
        reasoning:
          type: boolean
          description: Enable reasoning mode for more deliberate answers.
    CaptionRequest:
      type: object
      required:
      - model
      - image_url
      properties:
        model:
          $ref: '#/components/schemas/ModelId'
        image_url:
          $ref: '#/components/schemas/ImageInput'
        length:
          type: string
          enum:
          - short
          - normal
          - long
          default: normal
          description: Desired caption length.
        stream:
          type: boolean
          default: false
    BoundingBox:
      type: object
      description: Normalized bounding box (0..1) relative to image dimensions.
      properties:
        x_min:
          type: number
        y_min:
          type: number
        x_max:
          type: number
        y_max:
          type: number
    PointResponse:
      type: object
      properties:
        request_id:
          type: string
        points:
          type: array
          items:
            $ref: '#/components/schemas/Point'
    CaptionResponse:
      type: object
      properties:
        caption:
          type: string
        metrics:
          $ref: '#/components/schemas/Metrics'
        finish_reason:
          type: string
          examples:
          - stop
    QueryResponse:
      type: object
      properties:
        request_id:
          type: string
        answer:
          type: string
    Metrics:
      type: object
      properties:
        input_tokens:
          type: integer
        output_tokens:
          type: integer
        prefill_time_ms:
          type: number
        decode_time_ms:
          type: number
        ttft_ms:
          type: number
    SegmentResponse:
      type: object
      properties:
        path:
          type: string
          description: SVG path (normalized coordinates 0..1) describing the object mask.
        bbox:
          $ref: '#/components/schemas/BoundingBox'
    DetectRequest:
      type: object
      required:
      - model
      - image_url
      - object
      properties:
        model:
          $ref: '#/components/schemas/ModelId'
        image_url:
          $ref: '#/components/schemas/ImageInput'
        object:
          type: string
          description: The object class to detect / point at / segment.
    ImageInput:
      type: string
      description: Image as a data URL (base64) or a publicly reachable image URL.
      examples:
      - data:image/jpeg;base64,/9j/4AAQSkZJRg...
  responses:
    RateLimited:
      description: Rate limit exceeded (2 req/sec base tier, 10 req/sec for funded accounts).
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Malformed request (missing model, image, or invalid parameters).
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    MoondreamAuth:
      type: apiKey
      in: header
      name: X-Moondream-Auth
      description: Moondream API key issued from the Moondream Cloud Console (https://moondream.ai/c/cloud/api-keys).
    BearerAuth:
      type: http
      scheme: bearer
      description: For the OpenAI-compatible endpoint, pass the Moondream API key as an OAuth-style bearer token.