# PubNub

**Canonical:** https://apis.io/providers/pubnub/  
**Website:** https://www.pubnub.com/  
**APIs profiled:** 2

PubNub is a realtime communication platform supporting pub/sub, presence, chat, App Context (object metadata), Functions (server-less compute on the edge), Push Notifications, and IoT messaging across 1B+ devices. The PubNub REST API runs at ps.pndsn.com; SDKs handle the underlying long-poll / WebSocket protocol. Authentication uses a publish/subscribe key pair per keyset.

## Kin Score — 34.6 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 34.6).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 45.6 |
| Governance | 13.6 |
| Contract Governance | 13.6 |
| Operational Transparency | 28.9 |
| Developer Ergonomics | 28.6 |
| Commercial Clarity | 26.3 |
| Access Clarity | 26.3 |

## Agent readiness — 23.9 (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 | documented |
| Event Surface Described | derived |
| Agent Skills | yes |
| 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 (2)

- **PubNub REST API** — Single REST surface for publish, subscribe (long-poll), presence, history, signal, and App Context. Pub/Sub key authentication. SDKs available for 50+ languages and platforms.
- **PubNub Functions** — Edge serverless functions executed on PubNub's network in response to messages, presence events, or HTTP triggers.

## Security (1)

- **Pubnub Domain Security** — TLSv1.2 · HSTS · DMARC

## Plans (1)

- **Pubnub Plans Pricing**

## Tags

Real-Time, WebSockets, Pub-Sub, IoT, Messaging, Chat, Presence, Functions

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