# Sozu

**Canonical:** https://apis.io/providers/sozu/  
**Website:** https://www.sozu.io/  
**APIs profiled:** 3

Sōzu is an open-source, fast and lightweight HTTP reverse proxy written in Rust, designed for high-performance traffic management in immutable infrastructure environments. It is configurable at runtime through a protobuf-based IPC protocol without requiring restarts, making it ideal for always-up deployments. Sōzu supports TLS termination, load balancing, and dynamic cluster configuration, and is developed by the sozu-proxy open-source organization on GitHub.

## Kin Score — 24.0 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 24.0).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 28.0 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 4.8 |
| 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 (3)

- **Sozu Command API** — The Sozu Command API provides programmatic control of the Sōzu HTTP reverse proxy at runtime. External tools communicate with the Sozu main process through a secure Unix socket ...
- **Sozu ACME Integration** — The Sozu ACME integration automates TLS certificate requests from Let's Encrypt and other ACME-enabled certificate authorities. Originally a standalone tool in the sozu-acme rep...
- **Sozu Command Futures API** — The sozu-command-futures library provides a futures-based async Rust API for configuring the Sōzu HTTP reverse proxy programmatically. It wraps the low-level IPC protocol in an ...

## Security (1)

- **Sozu Domain Security** — TLSv1.3 · DNSSEC

## Plans (1)

- **Sozu Plans Pricing**

## Tags

Proxy, Reverse Proxy, Load Balancing, Rust, Open-Source

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