# Retrofit

**Canonical:** https://apis.io/providers/retrofit/  
**Website:** https://square.github.io/retrofit/  
**APIs profiled:** 4

Retrofit is a type-safe HTTP client for Android and the JVM (Java and Kotlin) built by Square, turning HTTP API interfaces into callable Java objects with annotation-based configuration and pluggable serialization. Retrofit is built on top of OkHttp and supports synchronous/asynchronous execution, JSON/XML/Protobuf converters, RxJava adapters, and Kotlin coroutines. Current stable version is 3.0.0.

## Kin Score — 18.0 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 18.0).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 18.7 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Education & Research**: 9.3 (matched via tags).

## Agent readiness — 2.5 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (4)

- **Retrofit** — Retrofit is a type-safe HTTP client for the JVM that turns annotated Java/Kotlin interfaces into HTTP API calls. Supports all HTTP methods via annotations. Built on OkHttp with ...
- **Retrofit Converters** — Pluggable serialization converters for Retrofit supporting Gson, Moshi, Jackson, Kotlinx Serialization, JAXB, Protocol Buffers (Wire), SimpleXML, and Scalars.
- **Retrofit Call Adapters** — Pluggable call adapters that allow Retrofit interfaces to return RxJava Observables (v1, v2, v3), Java 8 CompletableFuture, Guava ListenableFuture, and Scala Future types.
- **Retrofit Mock** — Provides behavior-simulating implementations of Retrofit interfaces for local testing without requiring a network connection.

## Plans (1)

- **Retrofit Plans Pricing**

## Tags

Android, HTTP Client, Java, Kotlin, Library, Mobile, Open-Source, SDK, Square

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/retrofit/). Scores are computed from the provider's own public artifacts under a published rubric.