# MQTT

**Canonical:** https://apis.io/providers/mqtt/  
**Website:** https://mqtt.org  
**APIs profiled:** 2

MQTT (Message Queuing Telemetry Transport) is an OASIS-standard, lightweight publish/subscribe messaging transport protocol designed for constrained devices and low-bandwidth, high-latency, or unreliable networks, making it the de-facto messaging protocol for IoT and machine-to-machine (M2M) communication. MQTT is a protocol specification rather than a hosted API: clients connect over TCP/TLS (typically port 1883 or 8883) or WebSocket (8080/8081) to an MQTT broker (such as Mosquitto, HiveMQ, EMQX, or AWS IoT Core) and exchange CONNECT, PUBLISH, SUBSCRIBE, and other control packets defined by the standard. The current standard is MQTT Version 5.0 (OASIS Standard, 7 March 2019); MQTT 3.1.1 remains widely deployed.

## Kin Score — 18.9 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 18.9).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 45.1 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 2.4 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 20.5 (agent-aware)

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

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (2)

- **MQTT Version 5.0 Protocol** — OASIS Standard publish/subscribe messaging protocol for IoT and M2M communication. MQTT v5.0 defines the wire format and behavior of CONNECT, PUBLISH, SUBSCRIBE, UNSUBSCRIBE, PI...
- **MQTT Version 3.1.1 Protocol** — Previous OASIS Standard version of MQTT, still widely deployed across IoT brokers, devices, and cloud platforms. MQTT 3.1.1 defines the publish/subscribe messaging semantics, Qo...

## Security (1)

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

## Tags

MQTT, Messaging, Publish Subscribe, IoT, M2M, Protocol, OASIS Standard, Telemetry

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