Sketchfab

Sketchfab Download API

Programmatic download of 3D models from Sketchfab's library in glTF, GLB, and USDZ formats. Requires end-user OAuth authentication. Source formats (FBX, OBJ, etc.) are not exposed through the public API; application-level download access without user authentication requires a contract with Sketchfab.

Sketchfab Download API is one of 5 APIs that Sketchfab publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

This API exposes 1 machine-runnable capability that can be deployed as REST, MCP, or Agent Skill surfaces via Naftiko.

Tagged areas include 3D, Models, Download, glTF, and USDZ. The published artifact set on APIs.io includes API documentation, an OpenAPI specification, and 1 Naftiko capability spec.

GitHub OpenAPI

Documentation

📖
Documentation
https://sketchfab.com/developers/download-api

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/sketchfab/refs/heads/main/openapi/sketchfab-download-api-openapi.yml

Other Resources

🔗
NaftikoCapability
https://raw.githubusercontent.com/api-evangelist/sketchfab/refs/heads/main/capabilities/download-models.yaml

OpenAPI Specification

sketchfab-download-api-openapi.yml Raw ↑ 
openapi: 3.1.0
info:
  title: Sketchfab Download API
  description: >
    Programmatic download of downloadable Sketchfab models in glTF, GLB, and
    USDZ formats. The endpoint returns short-lived signed URLs for each
    available format. The caller must be authenticated on behalf of an end
    user (OAuth Authorization Code or Implicit flow); application-level
    downloads without user authentication require a direct contract with
    Sketchfab. Source formats (FBX, OBJ) are not exposed.
  version: v3
  contact:
    name: Sketchfab Developer Support
    url: https://support.fab.com/s/?ProductOrigin=Sketchfab
  license:
    name: Sketchfab Developer Terms of Use
    url: https://sketchfab.com/developers/terms
servers:
  - url: https://api.sketchfab.com
    description: Production API
security:
  - OAuth2: []
tags:
  - name: Download
    description: Retrieve signed download URLs for a model.
paths:
  /v3/models/{uid}/download:
    get:
      summary: Retrieve Model Download URLs
      description: Returns short-lived signed URLs to the glTF, GLB, and USDZ archives for the requested model. The model must be marked downloadable and the caller must have permission to download it (license-compatible or owned).
      operationId: getModelDownload
      tags:
        - Download
      parameters:
        - name: uid
          in: path
          required: true
          description: The Sketchfab model UID.
          schema:
            type: string
      responses:
        '200':
          description: Download URLs by format.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DownloadEnvelope'
        '401':
          $ref: '#/components/responses/Error'
        '403':
          $ref: '#/components/responses/Error'
        '404':
          $ref: '#/components/responses/Error'
components:
  securitySchemes:
    OAuth2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://sketchfab.com/oauth2/authorize/
          tokenUrl: https://sketchfab.com/oauth2/token/
          refreshUrl: https://sketchfab.com/oauth2/token/
          scopes:
            read: Read access including model downloads.
  responses:
    Error:
      description: Error response.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    DownloadEnvelope:
      type: object
      properties:
        gltf:
          $ref: '#/components/schemas/DownloadEntry'
        glb:
          $ref: '#/components/schemas/DownloadEntry'
        usdz:
          $ref: '#/components/schemas/DownloadEntry'
    DownloadEntry:
      type: object
      properties:
        url:
          type: string
          format: uri
          description: Short-lived signed download URL.
        size:
          type: integer
          description: Archive size in bytes.
        expires:
          type: integer
          description: Seconds until the signed URL expires.
    Error:
      type: object
      properties:
        detail:
          type: string
        code:
          type: string