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 API contracts indexed 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 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.8/100 emerging ▬ flat Agent 22/100 agent aware Front door AI 1/6 silent Heartbeat 48/100 going silent Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

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 2026-11-13 · rubric v0.28.0

Composite quality — 22.8/100 · emerging

Contract Quality 10.4 / 21

Developer Ergonomics 2.0 / 17

Access Clarity 1.1 / 17

Operational Transparency 1.3 / 11

Contract Governance 1.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 0.7 / 15

Agent readiness — 22/100 · 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Developer Ergonomics scores 11.9 — up to +17.6 composite points Ask about this →
Contract Quality scores 49.0 — up to +12.8 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/opencost/apis.yml: open an issue on github.com/api-evangelist/opencost to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Cloud Native (Kubernetes, CNCF, FinOps)	standard	34.5 (thin)	-	-
Artifact Hub Cloud-Native Packages	standard	34.5 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 5

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

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

OpenCost API pricing

Not yet checked against OpenCost's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against OpenCost's documentation. All 5 limits →

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. Counts are the severity each rule declares, not results of running them.

OpenCost — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

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 (API Evangelist recommendations) 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

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 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: low
  try_now_blocked_by: loopback
  source:
  - plans
  - security
  generated: '2026-11-13'
  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: Plans
  url: plans/opencost-plans-pricing.yml
- type: RateLimits
  url: rate-limits/opencost-rate-limits.yml
- type: FinOps
  url: finops/opencost-finops.yml
- 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

OpenCost API — frequently asked questions

Does OpenCost have an API?

Yes. APIs.io lists 4 APIs from OpenCost, including OpenCost Allocation API, OpenCost Assets API and OpenCost CloudCost API, and 1 more.

Is there an OpenAPI specification for the OpenCost API?

Yes. APIs.io indexes 4 OpenAPI specifications for OpenCost, each linked for download from this page.

How much does the OpenCost API cost?

APIs.io lists 3 pricing plans for OpenCost, with each plan's price, limits and inclusions under Pricing on this page.

Is the OpenCost API ready for AI agents?

OpenCost has a Kin Score of 22.8 out of 100 (emerging) and an Agent Readiness score of 21.8 (agent-aware), scored by API Evangelist on 2026-11-13.

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Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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