# Caddy

**Canonical:** https://apis.io/providers/caddy/  
**Website:** https://caddyserver.com/  
**APIs profiled:** 6

Caddy is a modern, extensible, open-source web server and reverse proxy written in Go that provides automatic HTTPS via Let's Encrypt, a dynamic JSON-based admin API, a human-friendly Caddyfile configuration format, and a modular architecture with a rich ecosystem of plugins for authentication, observability, and custom behavior.

## Kin Score — 26.1 / 100 (emerging)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 26.1).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 39.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 36.8 |
| Developer Ergonomics | 9.5 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

## Agent readiness — 22.6 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | documented |
| 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 |

## Access

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

## APIs (6)

- **Caddy Admin API** — Caddy exposes a RESTful administration API on localhost:2019 by default for dynamically loading and modifying server configuration at runtime without restarts. Endpoints support...
- **Caddy Adapt API** — The Adapt API from Caddy — 1 operation(s) for adapt.
- **Caddy Configuration API** — The Configuration API from Caddy — 1 operation(s) for configuration.
- **Caddy Lifecycle API** — The Lifecycle API from Caddy — 2 operation(s) for lifecycle.
- **Caddy PKI API** — The PKI API from Caddy — 2 operation(s) for pki.
- **Caddy Reverse Proxy API** — The Reverse Proxy API from Caddy — 1 operation(s) for reverse proxy.

## Agentic access (1)

- **Caddy Agentic Access** — 11 operations · 7 acting · 1 human-in-the-loop

## Security (1)

- **Caddy Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Caddy Plans Pricing**

## Tags

Automatic HTTPS, Go, Load Balancer, Reverse Proxy, TLS, Web Server

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