OpenFaaS

OpenFaaS provides an open-source serverless functions framework that enables developers to deploy functions on any cloud, Kubernetes, or on‑premises environment. It emphasizes portability, simplicity, and production‑grade features, offering a rich ecosystem of templates, a web UI, and extensive language support. The platform is used by enterprises and hobbyists alike to build scalable, event‑driven applications with minimal operational overhead.

OpenFaaS is listed with 7 APIs on the APIs.io network, including Alexellis API, Async Function API, and 5 more. Tagged areas include Company, Serverless, Open Source, Functions, and Kubernetes.

The OpenFaaS catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

OpenFaaS’s developer surface includes support, getting-started guide, authentication, API reference, documentation, engineering blog, pricing, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.6/100 thin ▼ -5.1 Agent 18/100 agent aware Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

7 APIs

Company Serverless Open Source Functions Kubernetes

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 28.6/100 · thin

Contract Quality 4.8 / 19

Developer Ergonomics 4.5 / 15

Access Clarity 5.5 / 15

Operational Transparency 0.3 / 10

Contract Governance 2.0 / 9

Discoverability 4.8 / 8

Regulatory Posture 2.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 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 0 / 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 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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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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 25.8 — up to +18.6 composite points
Developer Ergonomics scores 29.8 — up to +14.0 composite points
Operational Transparency scores 2.6 — up to +12.7 composite points

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.

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/openfaas/apis.yml: open an issue on github.com/api-evangelist/openfaas 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 →

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 7

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

OpenFaaS API

Serverless functions API documented at OpenFaaS docs.

OpenFaaS Alexellis API

The Alexellis API from OpenFaaS — 1 operation(s) for alexellis.

OpenFaaS Async Function API

The Async Function API from OpenFaaS — 2 operation(s) for async function.

OpenFaaS Auth API

The Auth API from OpenFaaS — 1 operation(s) for auth.

OpenFaaS Function API

The Function API from OpenFaaS — 1 operation(s) for function.

OpenFaaS OpenFaaS API

The OpenFaaS API API from OpenFaaS — 1 operation(s) for openfaas api.

OpenFaaS System API

The System API from OpenFaaS — 2 operation(s) for system.

Scroll for all 7

OpenFaaS API pricing

Prices published by OpenFaaS, read 2026-10-14 from www.openfaas.com/pricing/.

Plan	Price
Community Edition (CE)	$0 *
OpenFaaS Standard	$1250/ mo *
OpenFaaS for Enterprises	Custom

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Openfaas Plans Pricing

3 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

OpenFaaS

SLA

Semantic Vocabularies 1

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

Openfaas Context

6 classes · 11 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

OpenFaaS API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

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

GetFunctionFunctionidResponse

10 properties

JSON SCHEMA

GetSystemFunctionEnvResponse

10 properties

JSON SCHEMA

PostRequest

2 properties

JSON SCHEMA

PutRequest

2 properties

JSON SCHEMA

PutSystemFunctionsRequest

5 properties

JSON SCHEMA

PutSystemFunctionsResponse

10 properties

JSON SCHEMA

Security Posture 2

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

Openfaas Authentication

4 schemes

SECURITY

Openfaas Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: openfaas
name: OpenFaaS
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  probe_state: unreadable
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.openfaas.com/images/preview_image.png
description: OpenFaaS provides an open-source serverless functions framework that enables developers to deploy functions on
  any cloud, Kubernetes, or on‑premises environment. It emphasizes portability, simplicity, and production‑grade features,
  offering a rich ecosystem of templates, a web UI, and extensive language support. The platform is used by enterprises and
  hobbyists alike to build scalable, event‑driven applications with minimal operational overhead.
url: https://raw.githubusercontent.com/api-evangelist/openfaas/refs/heads/main/apis.yml
x-type: company
x-source: harvest:tag-qc
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-14 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-14'
modified: '2026-10-14'
x-docs-platform: mkdocs
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
x-docs-hosting: netlify
tags:
- Company
- Serverless
- Open Source
- Functions
- Kubernetes
tags_raw:
- Company
- Serverless
- Open-source
- Functions
- Kubernetes
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Support
  url: https://www.openfaas.com/support/
- type: GettingStarted
  url: https://docs.openfaas.com/contributing/get-started/
- type: Plans
  url: plans/openfaas-plans-pricing.yml
- type: Spectral
  url: rules/openfaas-rules.yml
- type: JSONLD
  url: json-ld/openfaas-context.jsonld
- type: Vocabulary
  url: vocabulary/openfaas-vocabulary.yml
- type: DataModel
  url: data-model/openfaas-data-model.yml
- type: Authentication
  url: authentication/openfaas-authentication.yml
- type: Conformance
  url: conformance/openfaas-conformance.yml
- type: Hosts
  url: hosts/openfaas-hosts.yml
- type: Vendors
  url: vendors/openfaas-vendors.yml
- type: Leadership
  url: https://www.openfaas.com/team/
- type: GitHubOrganization
  url: https://github.com/openfaas
- type: APIReference
  url: https://docs.openfaas.com/reference/yaml/
- type: DomainSecurity
  url: security/openfaas-domain-security.yml
- type: Website
  url: https://www.openfaas.com
- type: Documentation
  url: https://docs.openfaas.com
- type: Blog
  url: https://www.openfaas.com/blog
- type: Pricing
  url: https://www.openfaas.com/pricing
apis:
- name: OpenFaaS API
  description: Serverless functions API documented at OpenFaaS docs.
  humanURL: https://docs.openfaas.com/reference/yaml/
  baseURL: null
  aid: openfaas:openfaas-api
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/openfaas-openapi-generated.yml
    x-provenance: generated
- aid: openfaas:openfaas-alexellis-api
  name: OpenFaaS Alexellis API
  description: The Alexellis API from OpenFaaS — 1 operation(s) for alexellis.
  humanURL: https://docs.openfaas.com/reference/yaml/
  baseURL: https://github.com
  tags:
  - Alexellis
  properties:
  - type: OpenAPI
    url: openapi/openfaas-alexellis-api-openapi.yml
  - type: JSONSchema
    url: json-schema/openfaas-get-function-functionid-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-get-system-function-env-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-post-request-schema.json
- aid: openfaas:openfaas-async-function-api
  name: OpenFaaS Async Function API
  description: The Async Function API from OpenFaaS — 2 operation(s) for async function.
  humanURL: https://docs.openfaas.com/reference/yaml/
  baseURL: https://github.com
  tags:
  - Async Function
  properties:
  - type: OpenAPI
    url: openapi/openfaas-async-function-api-openapi.yml
  - type: JSONSchema
    url: json-schema/openfaas-get-function-functionid-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-get-system-function-env-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-post-request-schema.json
- aid: openfaas:openfaas-auth-api
  name: OpenFaaS Auth API
  description: The Auth API from OpenFaaS — 1 operation(s) for auth.
  humanURL: https://docs.openfaas.com/reference/yaml/
  baseURL: https://github.com
  tags:
  - Authentication
  tags_raw:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/openfaas-auth-api-openapi.yml
  - type: JSONSchema
    url: json-schema/openfaas-get-function-functionid-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-get-system-function-env-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-post-request-schema.json
- aid: openfaas:openfaas-function-api
  name: OpenFaaS Function API
  description: The Function API from OpenFaaS — 1 operation(s) for function.
  humanURL: https://docs.openfaas.com/reference/yaml/
  baseURL: https://github.com
  tags:
  - Function
  properties:
  - type: OpenAPI
    url: openapi/openfaas-function-api-openapi.yml
  - type: JSONSchema
    url: json-schema/openfaas-get-function-functionid-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-get-system-function-env-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-post-request-schema.json
- aid: openfaas:openfaas-openfaas-api-api
  name: OpenFaaS OpenFaaS API
  description: The OpenFaaS API API from OpenFaaS — 1 operation(s) for openfaas api.
  humanURL: https://docs.openfaas.com/reference/yaml/
  baseURL: https://github.com
  tags:
  - OpenFaaS API
  properties:
  - type: OpenAPI
    url: openapi/openfaas-openfaas-api-api-openapi.yml
  - type: JSONSchema
    url: json-schema/openfaas-get-function-functionid-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-get-system-function-env-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-post-request-schema.json
- aid: openfaas:openfaas-system-api
  name: OpenFaaS System API
  description: The System API from OpenFaaS — 2 operation(s) for system.
  humanURL: https://docs.openfaas.com/reference/yaml/
  baseURL: https://github.com
  tags:
  - System
  properties:
  - type: OpenAPI
    url: openapi/openfaas-system-api-openapi.yml
  - type: JSONSchema
    url: json-schema/openfaas-get-function-functionid-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-get-system-function-env-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-response-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-system-functions-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-put-request-schema.json
  - type: JSONSchema
    url: json-schema/openfaas-post-request-schema.json
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: OpenFaaS API docs are HTML only; attempts to fetch OpenAPI at https://api.openfaas.com/openapi.json returned 401
    unauthorized.
  evidence:
  - url: https://api.openfaas.com/openapi.json
    status: 401
  checked: '2026-10-14'
x-enrichment:
  date: '2026-10-14'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

OpenFaaS API — frequently asked questions

Does OpenFaaS have an API?

Yes. APIs.io lists 7 APIs from OpenFaaS, including OpenFaaS API, OpenFaaS Alexellis API and OpenFaaS Async Function API, and 4 more.

Is there an OpenAPI specification for the OpenFaaS API?

Yes. APIs.io indexes 7 OpenAPI specifications for OpenFaaS, each linked for download from this page.

How do I authenticate with the OpenFaaS API?

OpenFaaS uses bearer-token authentication (4 schemes). The details are profiled on APIs.io as Openfaas Authentication.

How much does the OpenFaaS API cost?

OpenFaaS publishes its prices; its Community Edition (CE) plan is $0 * as of 2026-10-14. APIs.io lists 3 pricing plans for OpenFaaS, with each plan's price, limits and inclusions under Pricing on this page.

Is the OpenFaaS API ready for AI agents?

OpenFaaS has a Kin Score of 28.6 out of 100 (thin) and an Agent Readiness score of 17.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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