Confluent Schema Registry

Confluent Schema Registry is the open-source serving layer for schema metadata used in Apache Kafka data pipelines. It exposes a RESTful interface for storing and retrieving Avro, JSON Schema, and Protobuf schemas, manages schema evolution through configurable compatibility rules (BACKWARD, FORWARD, FULL, and transitive variants), supports schema references and contexts, and integrates with Kafka producers and consumers via shipped serializers and deserializers. Schema Registry is distributed under the Confluent Community License and is a core component of both Confluent Platform and Confluent Cloud.

Confluent Schema Registry publishes 5 APIs on the APIs.io network, including Compatibility API, Mode API, Schemas API, and 2 more. Tagged areas include Apache Kafka, Avro, Compatibility, Confluent, and Data Governance.

The Confluent Schema Registry catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Confluent Schema Registry’s developer surface includes documentation, getting-started guide, API reference, GitHub presence, engineering blog, pricing, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

34.7/100 thin ▬ flat Agent 27/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs 12 Agent Skills

Apache Kafka Avro CompatibilityConfluentData Governance Data Streaming JSON-Schema Open-Source Protobuf REST Schema Evolution Schema Registry

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 34.7/100 · thin

Contract Quality 11.3 / 23

Developer Ergonomics 6.9 / 18

Access Clarity 4.7 / 18

Operational Transparency 1.5 / 12

Contract Governance 1.5 / 11

Discoverability 6.0 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

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.

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/confluent-schema-registry: 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 →

APIs 5

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

Confluent Schema Registry Compatibility API

The Compatibility API from Confluent Schema Registry — 3 operation(s) for compatibility.

Confluent Schema Registry Mode API

The Mode API from Confluent Schema Registry — 1 operation(s) for mode.

Confluent Schema Registry Schemas API

The Schemas API from Confluent Schema Registry — 3 operation(s) for schemas.

Confluent Schema Registry Server API

The Server API from Confluent Schema Registry — 1 operation(s) for server.

Confluent Schema Registry Subjects API

The Subjects API from Confluent Schema Registry — 6 operation(s) for subjects.

Open Collections 7

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

API Collection

OPEN COLLECTION

Confluent Schema Registry Compatibility API

OPEN COLLECTION

Confluent Schema Registry Compatibility Mode API

OPEN COLLECTION

Confluent Schema Registry Compatibility Schemas API

OPEN COLLECTION

Confluent Schema Registry Compatibility Server API

OPEN COLLECTION

Confluent Schema Registry Compatibility Subjects API

OPEN COLLECTION

Confluent Schema Registry API

OPEN COLLECTION

Scroll for all 7

Agent Skills 12

Packaged agent skills for driving this provider's APIs from an AI assistant.

Bad_Frontmatter

AGENT SKILL

confluent-cloud-cdc-tableflow

AGENT SKILL

confluent-skill-creator

AGENT SKILL

confluent-skill-reviewer

AGENT SKILL

developing-kafka-python-client

AGENT SKILL

flink-udf

AGENT SKILL

good-skill

AGENT SKILL

inlined-refs

AGENT SKILL

kafka-schema-registry

AGENT SKILL

kafka-streams-programming

AGENT SKILL

stale-expectations

AGENT SKILL

trigger-overlap

AGENT SKILL

Scroll for all 12

Pricing Plans 1

Published pricing tiers and plan structures.

Confluent Schema Registry Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Confluent Schema Registry Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Confluent Schema Registry Finops

FINOPS

Semantic Vocabularies 1

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

Confluent Schema Registry Context

0 classes · 10 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Confluent Schema Registry API Rules

5 rules · 3 warnings 2 info

SPECTRAL

Confluent Schema Registry API Rules

10 rules · 4 errors 6 warnings

SPECTRAL

JSON Schema 1

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

Confluent Schema Registry Schema

7 properties

JSON SCHEMA

Security Posture 2

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

Confluent Schema Registry Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Confluent Schema Registry Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

Confluent Schema Registry Agentic Access

21 operations · 9 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkills

AgentSkills

LlmsText

LlmsText

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Spectral

Spectral

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

License

License

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: confluent-schema-registry
name: Confluent Schema Registry
description: Confluent Schema Registry is the open-source serving layer for schema metadata used in Apache Kafka data pipelines.
  It exposes a RESTful interface for storing and retrieving Avro, JSON Schema, and Protobuf schemas, manages schema evolution
  through configurable compatibility rules (BACKWARD, FORWARD, FULL, and transitive variants), supports schema references
  and contexts, and integrates with Kafka producers and consumers via shipped serializers and deserializers. Schema Registry
  is distributed under the Confluent Community License and is a core component of both Confluent Platform and Confluent Cloud.
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
position: Producing
access: Open Source
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/confluent-schema-registry.png
url: https://raw.githubusercontent.com/api-evangelist/confluent-schema-registry/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-05-19'
specificationVersion: '0.23'
kind: opensource
tags:
- Apache Kafka
- Avro
- Compatibility
- Confluent
- Data Governance
- Data Streaming
- JSON-Schema
- Open-Source
- Protobuf
- REST
- Schema Evolution
- Schema Registry
tags_raw:
- Apache Kafka
- Avro
- Compatibility
- Confluent
- Data Governance
- Data Streaming
- JSON Schema
- Open Source
- Protobuf
- REST
- Schema Evolution
- Schema Registry
apis:
- aid: confluent-schema-registry:confluent-schema-registry-compatibility-api
  name: Confluent Schema Registry Compatibility API
  description: The Compatibility API from Confluent Schema Registry — 3 operation(s) for compatibility.
  humanURL: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  baseURL: http://localhost:8081
  tags:
  - Compatibility
  properties:
  - type: OpenAPI
    url: openapi/confluent-schema-registry-compatibility-api-openapi.yml
  - type: Documentation
    url: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  - type: JSONSchema
    url: json-schema/schema-registry-schema.json
  - type: JSONLD
    url: json-ld/confluent-schema-registry-context.jsonld
  - type: Spectral
    url: rules/confluent-schema-registry-rules.yml
  - type: GitHub
    url: https://github.com/confluentinc/schema-registry
- aid: confluent-schema-registry:confluent-schema-registry-mode-api
  name: Confluent Schema Registry Mode API
  description: The Mode API from Confluent Schema Registry — 1 operation(s) for mode.
  humanURL: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  baseURL: http://localhost:8081
  tags:
  - Mode
  properties:
  - type: OpenAPI
    url: openapi/confluent-schema-registry-mode-api-openapi.yml
  - type: Documentation
    url: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  - type: JSONSchema
    url: json-schema/schema-registry-schema.json
  - type: JSONLD
    url: json-ld/confluent-schema-registry-context.jsonld
  - type: Spectral
    url: rules/confluent-schema-registry-rules.yml
  - type: GitHub
    url: https://github.com/confluentinc/schema-registry
- aid: confluent-schema-registry:confluent-schema-registry-schemas-api
  name: Confluent Schema Registry Schemas API
  description: The Schemas API from Confluent Schema Registry — 3 operation(s) for schemas.
  humanURL: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  baseURL: http://localhost:8081
  tags:
  - Schemas
  properties:
  - type: OpenAPI
    url: openapi/confluent-schema-registry-schemas-api-openapi.yml
  - type: Documentation
    url: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  - type: JSONSchema
    url: json-schema/schema-registry-schema.json
  - type: JSONLD
    url: json-ld/confluent-schema-registry-context.jsonld
  - type: Spectral
    url: rules/confluent-schema-registry-rules.yml
  - type: GitHub
    url: https://github.com/confluentinc/schema-registry
- aid: confluent-schema-registry:confluent-schema-registry-server-api
  name: Confluent Schema Registry Server API
  description: The Server API from Confluent Schema Registry — 1 operation(s) for server.
  humanURL: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  baseURL: http://localhost:8081
  tags:
  - Server
  properties:
  - type: OpenAPI
    url: openapi/confluent-schema-registry-server-api-openapi.yml
  - type: Documentation
    url: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  - type: JSONSchema
    url: json-schema/schema-registry-schema.json
  - type: JSONLD
    url: json-ld/confluent-schema-registry-context.jsonld
  - type: Spectral
    url: rules/confluent-schema-registry-rules.yml
  - type: GitHub
    url: https://github.com/confluentinc/schema-registry
- aid: confluent-schema-registry:confluent-schema-registry-subjects-api
  name: Confluent Schema Registry Subjects API
  description: The Subjects API from Confluent Schema Registry — 6 operation(s) for subjects.
  humanURL: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  baseURL: http://localhost:8081
  tags:
  - Subjects
  properties:
  - type: OpenAPI
    url: openapi/confluent-schema-registry-subjects-api-openapi.yml
  - type: Documentation
    url: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
  - type: JSONSchema
    url: json-schema/schema-registry-schema.json
  - type: JSONLD
    url: json-ld/confluent-schema-registry-context.jsonld
  - type: Spectral
    url: rules/confluent-schema-registry-rules.yml
  - type: GitHub
    url: https://github.com/confluentinc/schema-registry
common:
- type: AgenticAccess
  url: agentic-access/confluent-schema-registry-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/confluent-schema-registry-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/confluent-schema-registry-domain-security.yml
- name: Agent Skills
  url: https://github.com/confluentinc/agent-skills
  type: AgentSkills
- type: Website
  url: https://www.confluent.io/
- type: Documentation
  url: https://docs.confluent.io/platform/current/schema-registry/
- type: GettingStarted
  url: https://docs.confluent.io/platform/current/schema-registry/develop/using.html
- type: APIReference
  url: https://docs.confluent.io/platform/current/schema-registry/develop/api.html
- type: GitHub
  url: https://github.com/confluentinc/schema-registry
- type: License
  url: https://www.confluent.io/confluent-community-license/
- type: Blog
  url: https://www.confluent.io/blog/
- type: Pricing
  url: https://www.confluent.io/pricing/
- type: JSONLD
  url: json-ld/confluent-schema-registry-context.jsonld
- type: Spectral
  url: rules/confluent-schema-registry-rules.yml
- type: Integrations
  url: https://www.confluent.io/partner/
- type: LlmsText
  url: https://docs.confluent.io/llms.txt
integrations:
- name: Become a Partner
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: confluent
x-relationship: product

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