# Resilience4j

**Canonical:** https://apis.io/providers/resilience4j/  
**Website:** https://resilience4j.readme.io/  
**APIs profiled:** 1

Resilience4j is a lightweight fault tolerance library designed for Java 17+ and functional programming, providing higher-order functions to enhance functional interfaces with Circuit Breaker, Rate Limiter, Retry, Bulkhead, TimeLimiter, and Cache patterns. Designed as a replacement for Netflix Hystrix, it integrates with Spring Boot 2 and 3, Micronaut, RxJava, Spring Reactor, Micrometer, Prometheus, and Dropwizard Metrics. Used in production by Deutsche Telekom (400M+ requests/day), PlayStation Network, AOL, and Auto Trader Group.

## Kin Score — 21.8 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 21.8).

| Facet | Score |
|---|---|
| Discoverability | 59.3 |
| Contract Quality | 24.0 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 10.7 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

## 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 (1)

- **Resilience4j** — Resilience4j is a lightweight fault tolerance library for Java 17+ using functional programming patterns. It provides six core resilience patterns: Circuit Breaker (prevents cas...

## Security (1)

- **Resilience4J Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Resilience4J Plans Pricing**

## Tags

Bulkhead, Circuit Breaker, Fault Tolerance, Java, Microservices, Rate Limiter, Resilience, Retry, Spring Boot, Functional Programming

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/resilience4j/). Scores are computed from the provider's own public artifacts under a published rubric.