CNCF
Providers using this tag (59)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Strong 2 Solid coverage with minor gaps
Developing 7 Usable, with meaningful gaps to close
Thin 23 Limited public surface area
Emerging 24 Early or largely undocumented
Minimal 3 Almost no public developer surface
APIs with this tag (26)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Strong 1 Solid coverage with minor gaps
Developing 4 Usable, with meaningful gaps to close
Buildpack SpecificationThe Buildpack API (currently 0.12) defines the contract between an individual buildpack and the lifecycle. ...Distribution SpecificationThe Distribution API (currently 0.3) defines how buildpacks, extensions, and builders are packaged as OCI a...Platform SpecificationThe Platform API (currently 0.15) defines how platforms (pack, kpack, Tekton Pipelines, GitLab Auto DevOps,...Emissary-IngressEmissary-Ingress is an open-source, Kubernetes-native API gateway built on Envoy Proxy and a CNCF incubatin...
Thin 3 Limited public surface area
Vineyard Kubernetes OperatorThe Vineyard Kubernetes Operator manages vineyard cluster lifecycle and orchestrates shared objects on Kube...Envoy AI GatewayEnvoy AI Gateway is an open-source extension to Envoy Proxy and Envoy Gateway, providing a Kubernetes-nativ...CloudEvents APICloudEvents is a CNCF specification for describing event data in a common way. It defines a core data model...
Emerging 18 Early or largely undocumented
Argo Workflows APIArgo Workflows is a Kubernetes-native workflow engine for orchestrating parallel jobs. Used extensively in ...Envoy Proxy Admin APIEnvoy is a high-performance, open-source edge and service proxy, and the underlying data plane for Istio, L...Istio Service Mesh APIIstio is the leading open-source service mesh providing traffic management, security (mTLS), and observabil...KEDA (Kubernetes Event-Driven Autoscaling) APIKEDA is a Kubernetes-based event-driven autoscaling component and CNCF graduate project. It provides fine-g...Kubernetes APIThe Kubernetes API is the foundation of the container orchestration ecosystem, providing REST endpoints for...Linkerd APILinkerd is a lightweight, security-first service mesh for Kubernetes. Built on Rust-based micro-proxy (link...Prometheus HTTP APIPrometheus is the de-facto open-source monitoring and alerting toolkit for cloud-native applications and a ...Open Policy Agent (OPA)Open Policy Agent is a CNCF-graduated open source general-purpose policy engine that enables unified, conte...SPIFFE - Secure Production Identity Framework for EveryoneSPIFFE is a CNCF-graduated open standard for workload identity in dynamic environments. It provides a frame...SPIRE - SPIFFE Runtime EnvironmentSPIRE is the reference implementation of SPIFFE, a CNCF-graduated production-ready toolchain for establishi...Runcrunc is a CLI tool for spawning and running containers on Linux according to the OCI (Open Container Initia...Score SpecificationThe Score Specification (score.yaml) is a declarative, platform-agnostic workload definition format that ca...Envoy GatewayEnvoy Gateway provides an expressive, extensible, role-oriented API for Kubernetes gateway management built...gRPC and Protocol BuffersgRPC is a high-performance RPC framework using HTTP/2 and Protocol Buffers (Protobuf) as its IDL and wire f...CloudEventsCNCF-graduated specification (graduated January 25, 2024) for describing event data in a common way. Define...NATSCNCF incubating high-performance, lightweight messaging system designed for cloud, edge, and IoT. Supports ...gRPC StreaminggRPC defines four RPC styles, three of which are streaming: server streaming, client streaming, and bidirec...NATS JetStreamPersistence layer for the NATS messaging system providing at-least-once and exactly-once streaming, key/val...
Score breakdown
Frequency
51.0
log-scaled weighted occurrences
Breadth
1.6
spread across providers
Quality lift
34.2
mean composite of providers using it
Cohesion
14.1
strength of nearest seed neighbor
Related tags
Kubernetes 39 co-occurrences
Cloud-Native 22 co-occurrences
Graduated 7 co-occurrences
OCI 8 co-occurrences
Operator 6 co-occurrences
GitOps 6 co-occurrences
Distributed Systems 7 co-occurrences
Specification 6 co-occurrences
Where this tag comes from
Provider tag48
Api tag26
Cohort brief
Auto-generatedThe 59 providers in the APIs.io catalog tagged CNCF, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
59
all scored
Mean Kin Score
28.6
+7.9 vs catalog 20.7
Mean Agent Readiness
14
+4.3 vs catalog 9.7
Spread
5.4–65.2
median 28.1 · σ 11.5
How the 59 split by band
Exemplar 0Strong 2Developing 7Thin 23Emerging 24Minimal 3
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 36.2 | 17.5 | +18.7 | 59 |
| Operational Transparency | 24.7 | 11.3 | +13.4 | 59 |
| Contract Governance | 18.3 | 6.4 | +11.9 | 59 |
| Developer Ergonomics | 25.4 | 17.9 | +7.5 | 59 |
| Discoverability | 64.3 | 60.4 | +3.9 | 59 |
| Access Clarity | 13.8 | 22.3 | -8.5 | 59 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 3% | 16% | -13 |
| MCP server (first-party) | 0% | 7% | -7 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 0% | 9% | -9 |
| Security | 90% | 88% | +2 |
| Arazzo workflows | 3% | 2% | +1 |
| Governance rules | 71% | 13% | +58 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
- 1 Logz.io 65.2
- 2 Kubernetes 55
- 3 Crossplane 46
- 4 KEDA 41.2
- 5 Argo 40.7
- 6 buildpacks-io 40.6
- 7 wasmCloud 40.1
- 8 Ambassador 39.3
- 9 Argo Workflows 39.3
- 10 Chaos Mesh 38.5
Top by Agent Readiness
- 1 Scalable Inference Serving 30.6
- 2 KEDA 30
- 3 Kubernetes 28.4
- 4 Akri 25.8
- 5 BFE 25.8
- 6 CoreDNS 25.8
- 7 Argo 25.5
- 8 Rook 25.5
- 9 Ambassador 24.8
- 10 Argo CD 24.4
All 59 members of this roster resolve to a scored provider in
the catalog.Generated from the catalog build of
25 August 2026, across 26891
providers, using the same computation served by the
APIs.io cohort API. Briefs are published for rosters of
5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for tags
7 MCP tools reach this
find_tagsBrowse and filter every tag in the catalog.get_cohortThis tag as a scored cohort — every provider carrying it, with scores.cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.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.
Call it yourself
curl for this page
This tag
curl "https://apis.io/api/v1/tags/cncf"
All tags
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort
curl "https://apis.io/api/v1/cohorts/tag/cncf"
The distribution (Pro)
curl "https://apis.io/api/v1/cohorts/tag/cncf/stats" \
-H "X-API-Key: $APIS_IO_KEY"Discovery needs no key. Ratings and market analysis are Pro.