Nagios
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.
Nagios publishes 11 APIs on the APIs.io network, including Config API, CPU API, Disk API, and 8 more. Tagged areas include Monitoring, Infrastructure Monitoring, Network Monitoring, Open Source, and IT Operations.
The Nagios catalog on APIs.io includes 1 JSON-LD context and 3 Spectral governance rulesets.
Nagios’ developer surface includes authentication, documentation, pricing, engineering blog, and 27 more developer resources.
Kin Score
APIs 13
Individual APIs this provider publishes, each with its own machine-readable definition.
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.
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Open Collections 3
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Nagios XI REST API
OPEN COLLECTIONNCPA (Nagios Cross-Platform Agent) API
OPEN COLLECTIONNRDP (Nagios Remote Data Processor) API
OPEN COLLECTIONPricing Plans 1
Published pricing tiers and plan structures.
Nagios Plans Pricing
PLANSSemantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Nagios Context
JSON-LDSpectral Rules 3
Spectral governance rulesets for linting and validating these APIs.
JSON Schema 4
Standalone JSON Schema definitions for this provider's data models.
Nagios Check Result
JSON SCHEMANagios XI Host
JSON SCHEMANagios XI Service
JSON SCHEMANCPA Metric Response
JSON SCHEMAJSON Structure 2
JSON Structure definitions describing this provider's data shapes.
Nagios Check Result Structure
JSON STRUCTURENagios Xi Host Structure
JSON STRUCTUREExamples 7
Example request and response payloads for these APIs.
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Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Build 7
SDKs, sample code, and the tooling you integrate with
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Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 4
The organization behind the API
Other 10
Properties that don't map to a standard resource type
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