# Nagios

**Canonical:** https://apis.io/providers/nagios/  
**Website:** https://www.nagios.org  
**APIs profiled:** 13

Nagios is a family of open-source and commercial IT infrastructure monitoring tools, including Nagios Core (the original open-source monitoring engine), Nagios XI (the commercial enterprise distribution), Nagios Fusion, Nagios Log Server, and Nagios Network Analyzer, used to monitor hosts, services, networks, applications, and metrics with alerting and reporting. Nagios Core itself has no central HTTP API; Nagios XI ships a built-in REST API (typically reached at https://{nagios-xi-host}/nagiosxi/api/v1/) for reading, writing, deleting, and updating monitoring configuration and status. The Nagios XI API is authenticated via a per-user API key passed as a query parameter or header. Passive check results can also be submitted via NRDP (HTTP, JSON/XML) or NSCA (encrypted TCP, port 5667), and the NCPA cross-platform agent exposes a hierarchical REST API on port 5693.

## Kin Score — 40.4 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 40.4).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 60.0 |
| Governance | 25.0 |
| Contract Governance | 25.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 31.0 |
| Commercial Clarity | 42.1 |
| Access Clarity | 42.1 |

## Agent readiness — 26.1 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (13)

- **NSCA (Nagios Service Check Acceptor)** — Encrypted binary TCP daemon (default port 5667) that accepts passive service/host check results from remote machines. Not REST — clients send tab-delimited records over a shared...
- **NRPE (Nagios Remote Plugin Executor)** — Daemon that runs Nagios plugins on a remote Linux/Unix host on TCP port 5666, returning the plugin's exit code and output to the Nagios server. Binary protocol, not REST.
- **Nagios Config API** — Admin-only endpoints to add, modify, and delete hosts and services.
- **Nagios CPU API** — System-wide CPU utilization and core counts.
- **Nagios Disk API** — Logical, physical, and mount-point disk metrics.
- **Nagios Interface API** — Network interface byte and packet counters.
- **Nagios Memory API** — Physical memory and swap.
- **Nagios Objects API** — Read-only backend for hosts, services, host groups, contacts, downtime, history, and other monitored objects.
- **Nagios Plugins API** — User-defined Nagios-style plugins executed by the agent.
- **Nagios Processes API** — Running process inventory and resource use.
- **Nagios Services API** — Host service / daemon status.
- **Nagios Submission API** — Submit passive check results and external commands.
- **Nagios System API** — Admin-only endpoints to manage Nagios XI subsystems, apply configuration, schedule downtime, and execute commands.

## Agentic access (1)

- **Nagios Agentic Access** — 33 operations · 7 acting

## Security (2)

- **Nagios Authentication** — apiKey · 3 schemes
- **Nagios Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Nagios Plans Pricing**

## Tags

Monitoring, Infrastructure Monitoring, Network Monitoring, Open-Source, IT Operations, Alerting, Observability, Nagios XI, Nagios Core, NCPA, NRPE, NSCA, NRDP

---

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