OpenCost website screenshot

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
43.7/100 developing ▬ flat Agent 25/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1
AccessFreemium
4 APIs
Cloud Cost ManagementCNCFFinOpsKubernetesObservability

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1
Composite quality — 43.7/100 · developing
Contract Quality 15.4 / 25
Developer Ergonomics 2.2 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 7.0 / 12
Discoverability 6.5 / 10
Agent readiness — 25/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 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 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/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.

OpenCost Allocation API

The Allocation API from OpenCost — 1 operation(s) for allocation.

OpenCost Assets API

The Assets API from OpenCost — 1 operation(s) for assets.

OpenCost CloudCost API

The CloudCost API from OpenCost — 1 operation(s) for cloudcost.

OpenCost CustomCost API

The CustomCost API from OpenCost — 2 operation(s) for customcost.

Open Collections 1

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

OpenCost API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Opencost Plans Pricing

3 plans

PLANS

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.

Opencost Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Opencost Context

0 classes · 3 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

OpenCost API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 3

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

OpenCost Allocation

13 properties

JSON SCHEMA

OpenCost Asset

6 properties

JSON SCHEMA

OpenCost CloudCost

1 properties

JSON SCHEMA

Security Posture 1

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

Opencost Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Opencost Agentic Access

5 operations

5 operations · 0 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 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
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: '0.19'
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:
  - 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:
  - 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