# OpenMeter

**Canonical:** https://apis.io/providers/openmeter/  
**Website:** https://openmeter.io/  
**APIs profiled:** 10

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.

## Kin Score — 37.6 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 37.6).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 47.9 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 47.4 |
| Access Clarity | 47.4 |

## Agent readiness — 19.8 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (10)

- **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.

## Agentic access (1)

- **Openmeter Agentic Access** — 36 operations · 14 acting

## Security (3)

- **Openmeter Authentication** — http · 1 scheme
- **Openmeter Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Openmeter Trust Center** — SOC 2

## Plans (1)

- **Openmeter Plans Pricing**

## Tags

Usage Metering, Billing, Entitlements, CloudEvents, Open-Source, Artificial Intelligence

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/openmeter/). Scores are computed from the provider's own public artifacts under a published rubric.