OpenMeter

OpenMeter Events API

Ingest usage events as CloudEvents and list ingested events.

Documentation GitHub OpenAPI

Business capability

Usage Metering BC-4250.10

Operations 2

GET /api/v1/events List ingested events #

POST /api/v1/events Ingest events #

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OpenAPI Specification

openapi: 3.2.0
info:
  title: OpenMeter Events API
  description: OpenMeter is open-source usage metering and billing for AI and API products.
  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: Events
  description: Ingest usage events as CloudEvents and list ingested events.
paths:
  /api/v1/events:
    get:
      operationId: listEvents
      tags:
      - Events
      summary: List ingested events
      description: Lists ingested events with optional time and subject filters.
      parameters:
      - name: from
        in: query
        schema:
          type: string
          format: date-time
      - name: to
        in: query
        schema:
          type: string
          format: date-time
      - name: limit
        in: query
        schema:
          type: integer
          default: 100
      responses:
        '200':
          description: List of ingested events.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/IngestedEvent'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: ingestEvents
      tags:
      - Events
      summary: Ingest events
      description: Ingests an event or batch of events following the CloudEvents specification. Send a single CloudEvent as application/cloudevents+json or a batch as application/cloudevents-batch+json.
      requestBody:
        required: true
        content:
          application/cloudevents+json:
            schema:
              $ref: '#/components/schemas/CloudEvent'
          application/cloudevents-batch+json:
            schema:
              type: array
              items:
                $ref: '#/components/schemas/CloudEvent'
      responses:
        '204':
          description: Events accepted for ingestion.
        '400':
          description: Malformed CloudEvent.
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    IngestedEvent:
      type: object
      properties:
        event:
          $ref: '#/components/schemas/CloudEvent'
        ingestedAt:
          type: string
          format: date-time
        validationError:
          type:
          - string
          - 'null'
    CloudEvent:
      type: object
      description: A usage event following the CloudEvents 1.0 specification.
      required:
      - id
      - source
      - type
      - subject
      properties:
        id:
          type: string
          description: Unique identifier for the event (used for idempotent deduplication).
          example: 1
        source:
          type: string
          description: Identifies the context in which the event happened.
          example: my-app
        specversion:
          type: string
          default: '1.0'
        type:
          type: string
          description: The CloudEvent type, matched by meters via eventType.
          example: api-calls
        subject:
          type: string
          description: The subject (e.g. customer or user) the usage is metered against.
          example: customer-1
        time:
          type: string
          format: date-time
        data:
          type: object
          description: Event payload; meter valueProperty and groupBy JSONPaths read from here.
          example:
            method: GET
            path: /v1/resource
            tokens: 1024
    Problem:
      type: object
      description: RFC 7807 problem details.
      properties:
        type:
          type: string
        title:
          type: string
        status:
          type: integer
        detail:
          type: string
  responses:
    Unauthorized:
      description: Authentication is required or the token is invalid.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Problem'
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: OpenMeter Cloud API token supplied as a Bearer token.