Pusher Channels API
Delivers hosted WebSocket pub/sub messaging with public, private, and presence channels for adding real-time features to web and mobile applications.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
App secret must be kept server-side at all times. Channel-level auth is enforced server-side per subscription. No fine-grained per-operation scoping — any authorized subscriber can receive all events on a channel.
⚡ Reliability
Best When
You want the simplest possible WebSocket push layer with minimal infrastructure and well-known SDKs across every major language and framework.
Avoid When
You need guaranteed message delivery, message history replay, or per-message acknowledgment semantics.
Use Cases
- • Pushing agent task completion notifications to browser clients without polling
- • Implementing presence channels to track which AI agents or users are currently connected to a session
- • Broadcasting live data feed updates (prices, scores, metrics) generated by an agent to many subscribers
- • Enabling client-triggered events so users can send lightweight signals back to a coordinating agent
- • Real-time collaboration signaling between a human operator and an autonomous agent dashboard
Not For
- • Storing or replaying message history — Pusher does not persist messages for later retrieval beyond a short buffer
- • High-volume machine-to-machine messaging at scale — connection and message limits on lower tiers become restrictive quickly
- • Complex routing, filtering, or transformation of messages — no server-side logic beyond basic channel fan-out
Interface
Authentication
Public channels require only app key. Private and presence channels require a server-side auth endpoint that signs channel subscriptions with the app secret. Agents acting as servers must implement this auth endpoint.
Pricing
Free tier is generous for development but concurrent connection limit is a hard ceiling that can surprise production workloads.
Agent Metadata
Known Gotchas
- ⚠ Private and presence channel subscriptions require a live HTTP auth endpoint — agents cannot pre-sign tokens offline, complicating serverless deployments
- ⚠ Client events (client-to-client messaging) are only available on presence and private channels and must be explicitly enabled in the dashboard
- ⚠ Message size is capped at 10KB per event; agents streaming large payloads must chunk data manually
- ⚠ The free tier concurrent connection limit (200) will be hit quickly if an agent spawns many parallel WebSocket connections
- ⚠ Pusher does not guarantee message ordering across channels or even within a channel during reconnection windows
Alternatives
Full Evaluation Report
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Scores are editorial opinions as of 2026-03-07.