OpenFeature

OpenFeature is a CNCF incubating open specification for feature flag management. It provides a vendor-agnostic API for evaluating feature flags, enabling developers to use a consistent interface regardless of the underlying feature flag provider. OpenFeature offers SDKs in multiple languages including Go, Java, JavaScript, Python, PHP, and .NET with a provider-based architecture.

OpenFeature publishes 1 API contract indexed on the APIs.io network: OFREP Core API. Tagged areas include Cloud-Native, Feature Flags, Feature Management, Incubating, and SDK.

The OpenFeature catalog on APIs.io includes 1 Spectral governance ruleset.

OpenFeature’s developer surface includes authentication, documentation, engineering blog, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.3/100 thin ▬ flat Agent 35/100 agent ready Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Cloud-Native Feature Flags Feature Management Incubating SDK Specification

What this lets a business do 1

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

Software Release & Deployment Management

BC-4210

OFREP Core

POST /ofrep/v1/evaluate/flags/{key} POST /ofrep/v1/evaluate/flags

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 28.3/100 · thin

Contract Quality 9.9 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 1.2 / 15

Operational Transparency 1.3 / 10

Contract Governance 1.4 / 9

Discoverability 4.8 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 35/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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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/openfeature: 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 →

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
OpenSSF Best Practices Badge Holders	undeclared	-	1	-
Artifact Hub Cloud-Native Packages	undeclared	-	1	-
Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers)	undeclared	-	1	-

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.

Specification

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

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

OpenFeature OFREP Core API

**Required**: Core APIs to implement to support OFREP. *This is the minimum set of APIs required for a flag management system to be OFREP compatible.*

Open Collections 1

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

OpenFeature Remote Evaluation Protocol (OFREP) OFREP Core API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Openfeature Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Openfeature Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Openfeature Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

OpenFeature — protocol rules

0 rules ·

SPECTRAL

Security Posture 2

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

Openfeature Authentication

apiKey/http · 2 schemes

SECURITY

Openfeature Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Openfeature Agentic Access

2 operations · 2 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

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

SpectralRules

SpectralRules

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

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

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: openfeature
name: OpenFeature
description: OpenFeature is a CNCF incubating open specification for feature flag management. It provides a vendor-agnostic
  API for evaluating feature flags, enabling developers to use a consistent interface regardless of the underlying feature
  flag provider. OpenFeature offers SDKs in multiple languages including Go, Java, JavaScript, Python, PHP, and .NET with
  a provider-based architecture.
url: https://openfeature.dev
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: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/openfeature.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Cloud-Native
- Feature Flags
- Feature Management
- Incubating
- SDK
- Specification
tags_raw:
- Cloud Native
- Feature Flags
- Feature Management
- Incubating
- SDKs
- Specification
created: '2026-03-16'
modified: '2026-05-19'
specificationVersion: '0.23'
type: Index
apis:
- aid: openfeature:openfeature-ofrep-core-api
  name: OpenFeature OFREP Core API
  description: "**Required**: Core APIs to implement to support OFREP.  \n*This is the minimum set of APIs required for a\
    \ flag management system to be OFREP compatible.*"
  humanURL: https://openfeature.dev/docs/reference/intro
  tags:
  - OFREP Core
  properties:
  - type: OpenAPI
    url: openapi/openfeature-ofrep-core-api-openapi.yml
  - type: Documentation
    url: https://openfeature.dev/docs/reference/intro
common:
- type: Plans
  url: plans/openfeature-plans-pricing.yml
- type: RateLimits
  url: rate-limits/openfeature-rate-limits.yml
- type: FinOps
  url: finops/openfeature-finops.yml
- type: CapabilityMap
  url: capabilities/openfeature-capability-edges.yml
  name: OpenFeature Business Capability Map
- type: Website
  url: https://www.openfeature.dev/
- type: AgenticAccess
  url: agentic-access/openfeature-agentic-access.yml
- type: DomainSecurity
  url: security/openfeature-domain-security.yml
- type: Authentication
  url: authentication/openfeature-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/openfeature
- type: Documentation
  name: OpenFeature Documentation
  description: Official OpenFeature documentation.
  url: https://openfeature.dev/docs/
- type: GitHubOrg
  name: OpenFeature GitHub
  description: Source code and SDKs.
  url: https://github.com/open-feature
- type: Integrations
  url: https://openfeature.dev/ecosystem/
- type: Blog
  url: https://openfeature.dev/blog/rss.xml
- type: SpectralRules
  url: https://github.com/open-feature/protocol/blob/98c4e0de5583c0d79dd938b82975c80125335e92/.spectral.yaml
integrations:
- name: OpenFeature
- name: Deploys by Netlify
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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Tools for providers

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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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