OpenMeter

OpenMeter is open-source usage metering and billing for AI and API products. It ingests usage events as CloudEvents, aggregates them through meters, answers usage queries, and turns that usage into entitlements, balances, grants, usage-driven notifications, and Stripe-backed billing. Available as an open-source project and as OpenMeter Cloud with a Bearer-token REST API at https://openmeter.cloud/api/v1.

OpenMeter publishes 10 APIs on the APIs.io network, including Billing API, Customers API, Entitlements API, and 7 more. Tagged areas include Usage Metering, Billing, Entitlements, CloudEvents, and Open Source.

OpenMeter’s developer surface includes authentication, documentation, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.2/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemiumSelf serve⚡ Free to try
10 APIs
Usage MeteringBillingEntitlementsCloudEventsOpen SourceAI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 39.2/100 · thin
Contract Quality 13.7 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 9.5 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 31/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/openmeter: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

OpenMeter Billing API

Billing profiles, invoices, and customer overrides.

OpenMeter Customers API

Customers used for entitlements, subscriptions, and billing.

OpenMeter Entitlements API

Metered, boolean, and static entitlements that gate access.

OpenMeter Events API

Ingest usage events as CloudEvents and list ingested events.

OpenMeter Features API

Features that entitlements are attached to.

OpenMeter Grants API

Usage grants that top up metered entitlement balances.

OpenMeter Meters API

Define meters that aggregate events and query usage.

OpenMeter Notifications API

Notification channels, rules, and events for usage-driven alerts.

OpenMeter Plans API

Product catalog plans for subscriptions.

OpenMeter Subjects API

Subjects that usage is metered against.

Scroll for all 10

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

OpenMeter API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Openmeter Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Openmeter Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Openmeter Finops

FINOPS

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Openmeter Authentication

http · 1 scheme

SECURITY

Openmeter Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Openmeter Trust Center

SOC 2

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Openmeter Agentic Access

36 operations · 14 acting

36 operations · 14 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: openmeter
url: https://raw.githubusercontent.com/api-evangelist/openmeter/refs/heads/main/apis.yml
name: OpenMeter
kind: company
description: OpenMeter is open-source usage metering and billing for AI and API products. It ingests usage events as CloudEvents,
  aggregates them through meters, answers usage queries, and turns that usage into entitlements, balances, grants, usage-driven
  notifications, and Stripe-backed billing. Available as an open-source project and as OpenMeter Cloud with a Bearer-token
  REST API at https://openmeter.cloud/api/v1.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/openmeter.png
tags:
- Usage Metering
- Billing
- Entitlements
- CloudEvents
- Open Source
- AI
created: '2026-07-01'
modified: '2026-07-01'
specificationVersion: '0.19'
apis:
- aid: openmeter:openmeter-billing-api
  name: OpenMeter Billing API
  description: Billing profiles, invoices, and customer overrides.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Billing
  properties:
  - type: OpenAPI
    url: openapi/openmeter-billing-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-customers-api
  name: OpenMeter Customers API
  description: Customers used for entitlements, subscriptions, and billing.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/openmeter-customers-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-entitlements-api
  name: OpenMeter Entitlements API
  description: Metered, boolean, and static entitlements that gate access.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Entitlements
  properties:
  - type: OpenAPI
    url: openapi/openmeter-entitlements-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-events-api
  name: OpenMeter Events API
  description: Ingest usage events as CloudEvents and list ingested events.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/openmeter-events-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-features-api
  name: OpenMeter Features API
  description: Features that entitlements are attached to.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Features
  properties:
  - type: OpenAPI
    url: openapi/openmeter-features-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-grants-api
  name: OpenMeter Grants API
  description: Usage grants that top up metered entitlement balances.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Grants
  properties:
  - type: OpenAPI
    url: openapi/openmeter-grants-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-meters-api
  name: OpenMeter Meters API
  description: Define meters that aggregate events and query usage.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Meters
  properties:
  - type: OpenAPI
    url: openapi/openmeter-meters-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-notifications-api
  name: OpenMeter Notifications API
  description: Notification channels, rules, and events for usage-driven alerts.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Notifications
  properties:
  - type: OpenAPI
    url: openapi/openmeter-notifications-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-plans-api
  name: OpenMeter Plans API
  description: Product catalog plans for subscriptions.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Plans
  properties:
  - type: OpenAPI
    url: openapi/openmeter-plans-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
- aid: openmeter:openmeter-subjects-api
  name: OpenMeter Subjects API
  description: Subjects that usage is metered against.
  humanURL: https://openmeter.io/docs/getting-started/ingestion
  baseURL: https://openmeter.cloud/api/v1
  tags:
  - Subjects
  properties:
  - type: OpenAPI
    url: openapi/openmeter-subjects-api-openapi.yml
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/ingestion
  - type: APIReference
    url: https://openmeter.io/docs/api
  - type: PostmanCollection
    url: collections/openmeter.postman_collection.json
  - type: OpenCollection
    url: collections/openmeter.opencollection.json
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/meters
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/query-usage
  - type: Documentation
    url: https://openmeter.io/docs/getting-started/subjects
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/overview
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/features
  - type: Documentation
    url: https://openmeter.io/docs/entitlements/grants
  - type: Documentation
    url: https://openmeter.io/docs/notifications/overview
  - type: Documentation
    url: https://openmeter.io/docs/billing/overview
common:
- type: AgenticAccess
  url: agentic-access/openmeter-agentic-access.yml
- type: TrustCenter
  url: security/openmeter-trust-center.yml
- type: DomainSecurity
  url: security/openmeter-domain-security.yml
- type: Authentication
  url: authentication/openmeter-authentication.yml
- type: GitHubOrganization
  url: https://github.com/openmeterio
- type: LinkedIn
  url: https://www.linkedin.com/company/openmeter
- type: Website
  url: https://openmeter.io/
- type: Documentation
  url: https://openmeter.io/docs
- type: Plans
  url: plans/openmeter-plans-pricing.yml
- type: RateLimits
  url: rate-limits/openmeter-rate-limits.yml
- type: FinOps
  url: finops/openmeter-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com