Apache Flink

Apache Flink is an open-source framework and distributed processing engine for stateful computations over unbounded and bounded data streams. It is designed to run in all common cluster environments and to perform computations at in-memory speed and at any scale. Flink exposes a REST API on the JobManager Dispatcher that allows external systems to query cluster status, submit and manage jobs, trigger savepoints and checkpoints, upload and run JARs, and inspect metrics, accumulators, and exception histories. The same REST endpoints power the Flink Web UI.

Apache Flink publishes 7 API contracts indexed on the APIs.io network, including Checkpoints API, Cluster API, Datasets API, and 4 more. Tagged areas include Big Data, Distributed Computing, Real-Time Analytics, Stream Processing, and Workflows.

The Apache Flink catalog on APIs.io includes 1 Spectral governance ruleset.

Apache Flink’s developer surface includes documentation, engineering blog, and 13 more developer resources.

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24.2/100 emerging ▬ flat Agent 19/100 agent aware Front door AI 3/6 light self hosted · Apache-2.0 Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 published contract

Big Data Distributed Computing Real-Time Analytics Stream Processing Workflows

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 24.2/100 · emerging

Contract Quality 5.9 / 16

Developer Ergonomics 2.2 / 13

Access Clarity 0.8 / 13

Operational Transparency 1.8 / 8

Contract Governance 1.1 / 8

Discoverability 3.7 / 7

Regulatory Posture 1.8 / 15

Open Source Surface 4.0 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · 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 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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

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.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against 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 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% 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 →
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) 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 →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →

9 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 16.7 — up to +16.7 composite points Ask about this →
Contract Quality scores 36.1 — up to +16.0 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/flink/apis.yml: open an issue on github.com/api-evangelist/flink 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.

Apache Flink Checkpoints API

Checkpoint configuration, status, and details.

Apache Flink Cluster API

Cluster lifecycle and configuration.

Apache Flink Datasets API

Cluster dataset listing and deletion.

Apache Flink Jobs API

Job lifecycle and inspection.

Apache Flink JA Rs API

JAR upload, listing, run, and delete.

Apache Flink Job Manager API

JobManager configuration, environment, logs, metrics, and threads.

Apache Flink Task Managers API

TaskManager listing and inspection.

Scroll for all 7

Open Collections 7

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

Apache Flink REST Checkpoints API

OPEN COLLECTION

Apache Flink REST Checkpoints Cluster API

OPEN COLLECTION

Apache Flink REST Checkpoints Datasets API

OPEN COLLECTION

Apache Flink REST Checkpoints JARs API

OPEN COLLECTION

Apache Flink REST Checkpoints JobManager API

OPEN COLLECTION

Apache Flink REST Checkpoints Jobs API

OPEN COLLECTION

Apache Flink REST Checkpoints TaskManagers API

OPEN COLLECTION

Scroll for all 7

Apache Flink API pricing

Not yet checked against Apache Flink'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 Apache Flink's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Apache Flink Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Apache Flink Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Apache Flink Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Apache Flink API Rules

44 rules · 42 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

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

Apache Flink Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Apache Flink Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Apache Flink Agentic Access

29 operations · 7 acting · 2 human-in-the-loop

29 operations · 7 acting

AGENTIC

Resources

Documentation 3

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

RESTAPIDocumentation

RESTAPIDocumentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubRepository

GitHubRepository

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Community

Community

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: flink
name: Apache Flink
description: Apache Flink is an open-source framework and distributed processing engine for stateful computations over unbounded
  and bounded data streams. It is designed to run in all common cluster environments and to perform computations at in-memory
  speed and at any scale. Flink exposes a REST API on the JobManager Dispatcher that allows external systems to query cluster
  status, submit and manage jobs, trigger savepoints and checkpoints, upload and run JARs, and inspect metrics, accumulators,
  and exception histories. The same REST endpoints power the Flink Web UI.
type: Index
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - 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
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/flink.png
url: https://raw.githubusercontent.com/api-evangelist/flink/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-05-19'
specificationVersion: '0.23'
tags:
- Big Data
- Distributed Computing
- Real-Time Analytics
- Stream Processing
- Workflows
apis:
- aid: flink:flink-checkpoints-api
  name: Apache Flink Checkpoints API
  description: Checkpoint configuration, status, and details.
  humanURL: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  baseURL: http://localhost:8081
  tags:
  - Checkpoints
  properties:
  - type: OpenAPI
    url: openapi/flink-checkpoints-api-openapi.yml
  - type: Documentation
    url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  - type: Website
    url: https://flink.apache.org/
  - type: GitHubRepository
    url: https://github.com/apache/flink
- aid: flink:flink-cluster-api
  name: Apache Flink Cluster API
  description: Cluster lifecycle and configuration.
  humanURL: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  baseURL: http://localhost:8081
  tags:
  - Cluster
  properties:
  - type: OpenAPI
    url: openapi/flink-cluster-api-openapi.yml
  - type: Documentation
    url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  - type: Website
    url: https://flink.apache.org/
  - type: GitHubRepository
    url: https://github.com/apache/flink
- aid: flink:flink-datasets-api
  name: Apache Flink Datasets API
  description: Cluster dataset listing and deletion.
  humanURL: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  baseURL: http://localhost:8081
  tags:
  - Datasets
  properties:
  - type: OpenAPI
    url: openapi/flink-datasets-api-openapi.yml
  - type: Documentation
    url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  - type: Website
    url: https://flink.apache.org/
  - type: GitHubRepository
    url: https://github.com/apache/flink
- aid: flink:flink-jobs-api
  name: Apache Flink Jobs API
  description: Job lifecycle and inspection.
  humanURL: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  baseURL: http://localhost:8081
  tags:
  - Job
  tags_raw:
  - Jobs
  properties:
  - type: OpenAPI
    url: openapi/flink-jobs-api-openapi.yml
  - type: Documentation
    url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  - type: Website
    url: https://flink.apache.org/
  - type: GitHubRepository
    url: https://github.com/apache/flink
- aid: flink:flink-jars-api
  name: Apache Flink JA Rs API
  description: JAR upload, listing, run, and delete.
  humanURL: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  baseURL: http://localhost:8081
  tags:
  - JARs
  properties:
  - type: OpenAPI
    url: openapi/flink-jars-api-openapi.yml
  - type: Documentation
    url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  - type: Website
    url: https://flink.apache.org/
  - type: GitHubRepository
    url: https://github.com/apache/flink
- aid: flink:flink-job-manager-api
  name: Apache Flink Job Manager API
  description: JobManager configuration, environment, logs, metrics, and threads.
  humanURL: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  baseURL: http://localhost:8081
  tags:
  - Job Manager
  properties:
  - type: OpenAPI
    url: openapi/flink-job-manager-api-openapi.yml
  - type: Documentation
    url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  - type: Website
    url: https://flink.apache.org/
  - type: GitHubRepository
    url: https://github.com/apache/flink
- aid: flink:flink-task-managers-api
  name: Apache Flink Task Managers API
  description: TaskManager listing and inspection.
  humanURL: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  baseURL: http://localhost:8081
  tags:
  - Task Managers
  properties:
  - type: OpenAPI
    url: openapi/flink-task-managers-api-openapi.yml
  - type: Documentation
    url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
  - type: Website
    url: https://flink.apache.org/
  - type: GitHubRepository
    url: https://github.com/apache/flink
common:
- type: Plans
  url: plans/flink-plans-pricing.yml
- type: RateLimits
  url: rate-limits/flink-rate-limits.yml
- type: FinOps
  url: finops/flink-finops.yml
- type: CodeOfConduct
  url: https://github.com/apache/.github/blob/main/.github/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/apache/flink/blob/master/.github/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/apache/flink/blob/master/LICENSE
- type: AgenticAccess
  url: agentic-access/flink-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/flink-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/flink-domain-security.yml
- type: Website
  url: https://flink.apache.org/
- type: Documentation
  url: https://nightlies.apache.org/flink/flink-docs-stable/
- type: RESTAPIDocumentation
  url: https://nightlies.apache.org/flink/flink-docs-stable/docs/ops/rest_api/
- type: GitHubRepository
  url: https://github.com/apache/flink
- type: Blog
  url: https://flink.apache.org/posts/
- type: Community
  url: https://flink.apache.org/community/
- type: Integrations
  url: https://flink.apache.org/ecosystem/
integrations:
- name: 2020/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Apache Flink API — frequently asked questions

Does Apache Flink have an API?

Yes. APIs.io lists 7 APIs from Apache Flink, including Apache Flink Checkpoints API, Apache Flink Cluster API and Apache Flink Datasets API, and 4 more.

Is there an OpenAPI specification for the Apache Flink API?

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

How much does the Apache Flink API cost?

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

Is the Apache Flink API ready for AI agents?

Apache Flink has a Kin Score of 24.2 out of 100 (emerging) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-11-13.

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