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 6 more developer resources.

🌐 Visit website 📡 Source on GitHub

22.2/100 emerging ▬ flat Agent 23/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFreemium

1 published contract

Cloud Cost Management CNCF FinOps Kubernetes Observability

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Information Technology Management

BC-600

AllocationAssetsCloudCostCustomCost

GET /allocation GET /assets GET /cloudCost GET /customCost/timeseries

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 22.2/100 · emerging

Contract Quality 10.4 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 1.6 / 15

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 Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. 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. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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 6

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

API Collection

OPEN COLLECTION

OpenCost Allocation API

OPEN COLLECTION

OpenCost Allocation Assets API

OPEN COLLECTION

OpenCost Allocation CloudCost API

OPEN COLLECTION

OpenCost Allocation CustomCost API

OPEN COLLECTION

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

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

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
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
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: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/opencost.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
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: CapabilityMap
  url: capabilities/opencost-capability-edges.yml
  name: OpenCost Business Capability Map
- 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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