openapi: 3.0.3
info:
  title: OpenMeter Billing Features API
  description: OpenMeter is open-source usage metering and billing for AI and API products. Ingest usage as CloudEvents, define meters that aggregate those events, query usage, manage subjects and customers, gate access with entitlements (metered, boolean, and static), features and grants, react to usage with notifications, and drive billing, plans, and subscriptions with Stripe integration. This is a faithful, representative subset of the real OpenMeter Cloud API (https://openmeter.cloud/api/v1) for API Evangelist catalog purposes; see the canonical spec at https://github.com/openmeterio/openmeter for the full surface.
  termsOfService: https://openmeter.io/terms
  contact:
    name: OpenMeter Support
    url: https://openmeter.io
    email: support@openmeter.io
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
  version: 1.0.0
servers:
- url: https://openmeter.cloud
  description: OpenMeter Cloud
- url: http://localhost:8888
  description: Self-hosted (open source, default)
security:
- BearerAuth: []
tags:
- name: Features
  description: Features that entitlements are attached to.
paths:
  /api/v1/features:
    get:
      operationId: listFeatures
      tags:
      - Features
      summary: List features
      responses:
        '200':
          description: List of features.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Feature'
    post:
      operationId: createFeature
      tags:
      - Features
      summary: Create feature
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Feature'
      responses:
        '201':
          description: Feature created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Feature'
  /api/v1/features/{featureId}:
    parameters:
    - name: featureId
      in: path
      required: true
      schema:
        type: string
    get:
      operationId: getFeature
      tags:
      - Features
      summary: Get feature
      responses:
        '200':
          description: A feature.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Feature'
    delete:
      operationId: deleteFeature
      tags:
      - Features
      summary: Delete (archive) feature
      responses:
        '204':
          description: Feature archived.
components:
  schemas:
    Feature:
      type: object
      required:
      - key
      - name
      properties:
        id:
          type: string
        key:
          type: string
          example: api_requests
        name:
          type: string
        meterSlug:
          type: string
          description: Optional meter this feature draws usage from (for metered entitlements).
          example: api_requests
        metadata:
          type: object
          additionalProperties: true
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: OpenMeter Cloud API token supplied as a Bearer token.