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.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Feign the way a machine reads it — 16 machine-readable artifacts across 12 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Feign scores 25.2/100 (emerging), with a separate agent-readiness read of 7/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Feign
Each block below is one kind of artifact we hold for Feign. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 12
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 within the panel for all 12 ·
GraphQL 1
Where a provider ships GraphQL, the schema is the contract. We profile it alongside the REST surface so the whole interface is legible in one place.
GraphQL schemas published by this provider.
Feign GraphQL API
GRAPHQLPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Feign Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Feign Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Feign Finops
FINOPSResources
Every other property we hold for Feign — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 1
Reference material describing how the API behaves
Build 1
SDKs, sample code, and the tooling you integrate with
Operate 2
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 1
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/feign · machine-readable index on apis.io