OpenCost

An open source CNCF specification and reference implementation for real-time cost monitoring of Kubernetes infrastructure and cloud spending, enabling teams to measure, allocate, and optimize cloud costs across workloads.

OpenCost publishes 4 APIs on the APIs.io network, including Allocation API, Assets API, CloudCost API, and 1 more. Tagged areas include Cloud Cost Management, CNCF, FinOps, Kubernetes, and Observability.

The OpenCost catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

OpenCost’s developer surface includes documentation, engineering blog, and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub

24.9/100 emerging ▬ flat Agent 23/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreemium

4 APIs

Cloud Cost Management CNCF FinOps Kubernetes Observability

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 24.9/100 · emerging

Contract Quality 13.5 / 25

Developer Ergonomics 2.4 / 20

Access Clarity 0.0 / 20

Operational Transparency 1.4 / 13

Contract Governance 1.2 / 12

Discoverability 6.5 / 10

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

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/opencost: 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 4

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

Rate Limits 1

Documented rate limits and quota policies.

Opencost Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

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 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: opencost
name: OpenCost
description: An open source CNCF specification and reference implementation for real-time cost monitoring of Kubernetes infrastructure
  and cloud spending, enabling teams to measure, allocate, and optimize cloud costs across workloads.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/opencost.png
tags:
- Cloud Cost Management
- CNCF
- FinOps
- Kubernetes
- Observability
url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: opencost:opencost-allocation-api
  name: OpenCost Allocation API
  description: The Allocation API from OpenCost — 1 operation(s) for allocation.
  humanURL: https://www.opencost.io/docs/integrations/api
  baseURL: http://localhost:9003
  tags:
  - Allocations
  tags_raw:
  - Allocation
  properties:
  - type: OpenAPI
    url: openapi/opencost-allocation-api-openapi.yml
  - type: Documentation
    url: https://www.opencost.io/docs/integrations/api
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-allocation-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-asset-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-cloudcost-schema.json
  - type: JSONLD
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-ld/opencost-context.jsonld
- aid: opencost:opencost-assets-api
  name: OpenCost Assets API
  description: The Assets API from OpenCost — 1 operation(s) for assets.
  humanURL: https://www.opencost.io/docs/integrations/api
  baseURL: http://localhost:9003
  tags:
  - Assets
  properties:
  - type: OpenAPI
    url: openapi/opencost-assets-api-openapi.yml
  - type: Documentation
    url: https://www.opencost.io/docs/integrations/api
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-allocation-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-asset-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-cloudcost-schema.json
  - type: JSONLD
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-ld/opencost-context.jsonld
- aid: opencost:opencost-cloudcost-api
  name: OpenCost CloudCost API
  description: The CloudCost API from OpenCost — 1 operation(s) for cloudcost.
  humanURL: https://www.opencost.io/docs/integrations/api
  baseURL: http://localhost:9003
  tags:
  - Cloud Cost
  tags_raw:
  - CloudCost
  properties:
  - type: OpenAPI
    url: openapi/opencost-cloudcost-api-openapi.yml
  - type: Documentation
    url: https://www.opencost.io/docs/integrations/api
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-allocation-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-asset-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-cloudcost-schema.json
  - type: JSONLD
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-ld/opencost-context.jsonld
- aid: opencost:opencost-customcost-api
  name: OpenCost CustomCost API
  description: The CustomCost API from OpenCost — 2 operation(s) for customcost.
  humanURL: https://www.opencost.io/docs/integrations/api
  baseURL: http://localhost:9003
  tags:
  - CustomCost
  properties:
  - type: OpenAPI
    url: openapi/opencost-customcost-api-openapi.yml
  - type: Documentation
    url: https://www.opencost.io/docs/integrations/api
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-allocation-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-asset-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-schema/opencost-cloudcost-schema.json
  - type: JSONLD
    url: https://raw.githubusercontent.com/api-evangelist/opencost/refs/heads/main/json-ld/opencost-context.jsonld
common:
- type: AgenticAccess
  url: agentic-access/opencost-agentic-access.yml
- type: DomainSecurity
  url: security/opencost-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/showcase/opencost
- type: Website
  url: https://opencost.io/
- type: Documentation
  url: https://www.opencost.io/docs/
- type: GitHubOrganization
  url: https://github.com/opencost/opencost
- url: https://opencost.io/blog/rss.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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