Noun Project Usage API

openapi: 3.2.0
info:
  title: Noun Project API V2 Autocomplete Usage API
  description: 'The Noun Project API V2 is an OAuth 1.0a-secured REST API that provides

    access to nearly 10 million royalty-free PNG and SVG icons. The API

    supports icon search with style and line-weight filtering, similar-icon

    lookup, collection browsing, custom hex-color recoloring, multiple

    thumbnail sizes, autocomplete suggestions, per-client blocklists, and

    real-time usage telemetry.


    Built on AWS with documented 99.99% uptime, the API serves more than

    300 million requests per month. All requests must be signed with OAuth

    1.0a using the client key and secret obtained from the Noun Project

    developer portal.

    '
  version: '2.0'
  termsOfService: https://thenounproject.com/legal/api-terms-of-use/
  contact:
    name: Noun Project API Support
    url: https://thenounproject.zendesk.com/
  license:
    name: Royalty-Free Commercial Use
    url: https://thenounproject.com/legal/api-terms-of-use/
  x-generated-from: documentation
  x-last-validated: '2026-05-28'
servers:
- url: https://api.thenounproject.com
  description: Noun Project API production endpoint
security:
- oauth1: []
tags:
- name: Usage
  description: Inspect current API key usage against documented quotas.
paths:
  /v2/client/usage:
    get:
      operationId: getUsage
      summary: Get Client Usage
      description: Return the calling client key's current usage and limits for the hourly, daily, and monthly windows.
      tags:
      - Usage
      responses:
        '200':
          description: Current usage and limit snapshot.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UsageResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
      security:
      - oauth1: []
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  responses:
    Unauthorized:
      description: Missing or invalid OAuth 1.0a credentials.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    ErrorResponse:
      type: object
      description: Standard error response payload returned for 4xx and 5xx responses.
      properties:
        error:
          type: string
          description: Machine-readable error code.
          example: rate_limit_exceeded
        message:
          type: string
          description: Human-readable error message.
          example: The monthly quota for this client key has been exceeded.
        status:
          type: integer
          description: HTTP status code echo.
          example: 429
        request_id:
          type: string
          description: Server-generated identifier for the failing request.
          example: req-abc123def456
    UsageWindow:
      type: object
      description: Usage statistics for a single time window.
      properties:
        service_calls_used:
          type: integer
          description: Non-icon API calls consumed in this window.
          example: 245
        service_calls_limit:
          type: integer
          description: Maximum non-icon API calls allowed in this window.
          example: 1000
        icon_calls_used:
          type: integer
          description: Icon-specific calls consumed in this window.
          example: 38
        icon_calls_limit:
          type: integer
          description: Maximum icon-specific calls allowed in this window.
          example: 150
        period_start:
          type: string
          format: date-time
          description: ISO 8601 timestamp of when this window started.
          example: '2026-05-28T00:00:00Z'
        period_end:
          type: string
          format: date-time
          description: ISO 8601 timestamp of when this window ends.
          example: '2026-05-29T00:00:00Z'
    UsageResponse:
      type: object
      description: Wrapper for the client usage response.
      properties:
        usage:
          $ref: '#/components/schemas/Usage'
        generated_at:
          type: string
          format: date-time
          description: ISO 8601 timestamp of when the response was generated.
          example: '2026-05-28T14:00:00Z'
      required:
      - usage
    Usage:
      type: object
      description: API key usage and quota information.
      properties:
        hourly:
          $ref: '#/components/schemas/UsageWindow'
        daily:
          $ref: '#/components/schemas/UsageWindow'
        monthly:
          $ref: '#/components/schemas/UsageWindow'
  securitySchemes:
    oauth1:
      type: apiKey
      in: header
      name: Authorization
      description: OAuth 1.0a signed Authorization header constructed with the client key and secret obtained from the Noun Project developer portal. A nonce of at least 8 characters is required. Use any standards-compliant OAuth 1.0a library (requests_oauthlib, Faraday-OAuth, DotNetOpenAuth, etc.).
      x-auth-type: OAuth 1.0a
      x-token-url: https://thenounproject.com/developers/apps/
externalDocs:
  description: Noun Project API Documentation
  url: https://api.thenounproject.com/documentation.html