Feign website screenshot

Feign

Feign (OpenFeign) is a declarative Java HTTP client binder inspired by Retrofit, JAX-RS, and WebSocket. It turns annotated interfaces into templated HTTP requests with pluggable encoders, decoders, error handlers, and HTTP transports. The OpenFeign organization maintains a large set of modules covering serialization (Jackson, Gson, Moshi, FastJSON2, JAXB, SAX, SOAP), HTTP transports (OkHttp, Apache HttpClient, Java 11 client, Ribbon), JAX-RS contracts, resilience (Hystrix), logging (SLF4J), form encoding, GraphQL, and metrics.

Feign publishes 12 APIs on the APIs.io network. Tagged areas include HTTP Client, Java, JVM, Open Source, and REST.

Feign’s developer surface includes documentation, release notes, and 5 more developer resources.

📡 Source on GitHub
14.8/100 emerging ▬ flat Agent 3/100 human only Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0
AccessFreemium
12 APIs
HTTP ClientJavaJVMOpen SourceRESTSDK

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0
Composite quality — 14.8/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 3.6 / 17
Access Clarity 2.7 / 17
Operational Transparency 2.9 / 11
Contract Governance 0.0 / 10
Discoverability 5.3 / 9
Regulatory Posture 0.0 / 15
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 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
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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
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/feign: 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 12

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

Feign Core

Feign Core is the base library that processes annotated Java interfaces into templated HTTP requests. It defines the contract, encoder, decoder, and client abstractions used acr...

Feign Jackson

Feign Jackson module provides Jackson-based JSON encoding and decoding for Feign-annotated client interfaces, the most common serialization choice in JVM applications.

Feign Gson

Feign Gson module provides Google Gson-based JSON encoding and decoding for Feign clients, useful in projects already standardized on Gson.

Feign OkHttp

Feign OkHttp module replaces the default JDK HTTP transport with Square's OkHttp client, adding HTTP/2, connection pooling, and modern transport features.

Feign Apache HttpClient

Feign Apache HttpClient module integrates Apache HttpComponents (HC5) as the underlying HTTP transport for Feign clients.

Feign Java 11 HTTP

Feign Java 11 HTTP module uses the JDK 11+ standard HttpClient as the transport, supporting HTTP/2 and asynchronous calls without external dependencies.

Feign Ribbon

Feign Ribbon module integrates Netflix Ribbon for client-side load balancing across a list of HTTP servers.

Feign Hystrix

Feign Hystrix module wraps Feign client calls in Netflix Hystrix commands, adding circuit breaking, fallbacks, and bulkhead isolation.

Feign JAX-RS

Feign JAX-RS modules let developers reuse JAX-RS 1.x, 2.x, 3.x, and 4.x annotations on Feign client interfaces instead of Feign's native annotation set.

Feign SLF4J

Feign SLF4J module routes Feign request and response logging through the SLF4J facade, integrating with the host application's logging backend.

Feign Form

Feign Form module adds support for application/x-www-form-urlencoded and multipart/form-data request bodies, including file uploads.

Feign Micrometer

Feign Micrometer module exposes Feign client metrics (timings, counts, errors) through Micrometer for shipment to Prometheus, Datadog, and other monitoring backends.

Scroll for all 12

Pricing Plans 1

Published pricing tiers and plan structures.

Feign Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Feign Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Feign Finops

FINOPS

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Operate 2

Status, limits, changes, and where to get help

Issues
Issues
 ReleaseNotes
ReleaseNotes

Commercial 1

Pricing, plans, and the legal terms of use

License
License

Company 1

The organization behind the API

Website
Website

Other 1

Properties that don't map to a standard resource type

Maven Central
Maven Central

Source (apis.yml)

apis.yml Raw ↑ 
aid: feign
name: Feign
description: Feign (OpenFeign) is a declarative Java HTTP client binder inspired by Retrofit, JAX-RS, and WebSocket. It turns
  annotated interfaces into templated HTTP requests with pluggable encoders, decoders, error handlers, and HTTP transports.
  The OpenFeign organization maintains a large set of modules covering serialization (Jackson, Gson, Moshi, FastJSON2, JAXB,
  SAX, SOAP), HTTP transports (OkHttp, Apache HttpClient, Java 11 client, Ribbon), JAX-RS contracts, resilience (Hystrix),
  logging (SLF4J), form encoding, GraphQL, and metrics.
type: Index
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:
  - none
  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
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/feign.png
access: 3rd-Party
created: '2026-03-27'
modified: '2026-04-28'
position: Consuming
tags:
- HTTP Client
- Java
- JVM
- Open Source
- REST
- SDK
tags_raw:
- HTTP Client
- Java
- JVM
- Open Source
- REST
- SDKs
- Open-Source
url: https://raw.githubusercontent.com/api-evangelist/feign/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: feign:feign-core
  name: Feign Core
  description: Feign Core is the base library that processes annotated Java interfaces into templated HTTP requests. It defines
    the contract, encoder, decoder, and client abstractions used across the entire OpenFeign ecosystem.
  humanURL: https://github.com/OpenFeign/feign
  tags:
  - HTTP Client
  - Java
  - Core
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign#readme
  - type: GettingStarted
    url: https://github.com/OpenFeign/feign#basics
  - type: Source Code
    url: https://github.com/OpenFeign/feign
  - type: Maven Central
    url: https://central.sonatype.com/artifact/io.github.openfeign/feign-core
- aid: feign:feign-jackson
  name: Feign Jackson
  description: Feign Jackson module provides Jackson-based JSON encoding and decoding for Feign-annotated client interfaces,
    the most common serialization choice in JVM applications.
  humanURL: https://github.com/OpenFeign/feign/tree/master/jackson
  tags:
  - JSON
  - Jackson
  - Serialization
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/jackson
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/jackson
- aid: feign:feign-gson
  name: Feign Gson
  description: Feign Gson module provides Google Gson-based JSON encoding and decoding for Feign clients, useful in projects
    already standardized on Gson.
  humanURL: https://github.com/OpenFeign/feign/tree/master/gson
  tags:
  - JSON
  - Gson
  - Serialization
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/gson
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/gson
- aid: feign:feign-okhttp
  name: Feign OkHttp
  description: Feign OkHttp module replaces the default JDK HTTP transport with Square's OkHttp client, adding HTTP/2, connection
    pooling, and modern transport features.
  humanURL: https://github.com/OpenFeign/feign/tree/master/okhttp
  tags:
  - HTTP Client
  - Transport
  - OkHttp
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/okhttp
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/okhttp
- aid: feign:feign-httpclient
  name: Feign Apache HttpClient
  description: Feign Apache HttpClient module integrates Apache HttpComponents (HC5) as the underlying HTTP transport for
    Feign clients.
  humanURL: https://github.com/OpenFeign/feign/tree/master/httpclient
  tags:
  - HTTP Client
  - Transport
  - Apache
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/httpclient
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/httpclient
- aid: feign:feign-java11
  name: Feign Java 11 HTTP
  description: Feign Java 11 HTTP module uses the JDK 11+ standard HttpClient as the transport, supporting HTTP/2 and asynchronous
    calls without external dependencies.
  humanURL: https://github.com/OpenFeign/feign/tree/master/java11
  tags:
  - HTTP Client
  - Transport
  - Java 11
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/java11
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/java11
- aid: feign:feign-ribbon
  name: Feign Ribbon
  description: Feign Ribbon module integrates Netflix Ribbon for client-side load balancing across a list of HTTP servers.
  humanURL: https://github.com/OpenFeign/feign/tree/master/ribbon
  tags:
  - Load Balancing
  - Netflix
  - Resilience
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/ribbon
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/ribbon
- aid: feign:feign-hystrix
  name: Feign Hystrix
  description: Feign Hystrix module wraps Feign client calls in Netflix Hystrix commands, adding circuit breaking, fallbacks,
    and bulkhead isolation.
  humanURL: https://github.com/OpenFeign/feign/tree/master/hystrix
  tags:
  - Resilience
  - Circuit Breaker
  - Netflix
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/hystrix
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/hystrix
- aid: feign:feign-jaxrs
  name: Feign JAX-RS
  description: Feign JAX-RS modules let developers reuse JAX-RS 1.x, 2.x, 3.x, and 4.x annotations on Feign client interfaces
    instead of Feign's native annotation set.
  humanURL: https://github.com/OpenFeign/feign/tree/master/jaxrs
  tags:
  - JAX-RS
  - Annotation
  - Contracts
  tags_raw:
  - JAX-RS
  - Annotations
  - Contracts
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/jaxrs
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/jaxrs
- aid: feign:feign-slf4j
  name: Feign SLF4J
  description: Feign SLF4J module routes Feign request and response logging through the SLF4J facade, integrating with the
    host application's logging backend.
  humanURL: https://github.com/OpenFeign/feign/tree/master/slf4j
  tags:
  - Logging
  - Observability
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/slf4j
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/slf4j
- aid: feign:feign-form
  name: Feign Form
  description: Feign Form module adds support for application/x-www-form-urlencoded and multipart/form-data request bodies,
    including file uploads.
  humanURL: https://github.com/OpenFeign/feign-form
  tags:
  - Forms
  - Multipart
  - File Upload
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign-form
  - type: Source Code
    url: https://github.com/OpenFeign/feign-form
- aid: feign:feign-micrometer
  name: Feign Micrometer
  description: Feign Micrometer module exposes Feign client metrics (timings, counts, errors) through Micrometer for shipment
    to Prometheus, Datadog, and other monitoring backends.
  humanURL: https://github.com/OpenFeign/feign/tree/master/micrometer
  tags:
  - Metrics
  - Observability
  - Micrometer
  properties:
  - type: Documentation
    url: https://github.com/OpenFeign/feign/tree/master/micrometer
  - type: Source Code
    url: https://github.com/OpenFeign/feign/tree/master/micrometer
common:
- type: Website
  url: https://github.com/OpenFeign/feign
- type: Documentation
  url: https://github.com/OpenFeign/feign#readme
- type: GitHubOrganization
  url: https://github.com/OpenFeign
- type: Issues
  url: https://github.com/OpenFeign/feign/issues
- type: ReleaseNotes
  url: https://github.com/OpenFeign/feign/releases
- type: License
  url: https://github.com/OpenFeign/feign/blob/master/LICENSE
- type: Maven Central
  url: https://central.sonatype.com/namespace/io.github.openfeign
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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