Azure Web PubSub Pricing and Features: Real-Time Messaging

Azure Web PubSub: Pricing, Features, and Enterprise Use Cases

TL;DR — Azure Web PubSub is a fully managed service for real-time messaging over standard WebSocket connections. It supports two communication models, scales to 100,000+ concurrent connections, and integrates natively with Azure Functions for serverless architectures. EPC Group has built Web PubSub solutions for Fortune 500 operations centers, healthcare facilities, and financial services firms.

Key facts

• Protocol-agnostic: works with any WebSocket client in any programming language
• Two communication models: simple WebSocket subprotocol and JSON-based subprotocol with built-in group management
• Scales to 100,000 concurrent connections (100 units per instance)
• Serverless-ready: Azure Functions trigger and output bindings
• EPC Group: 29 years of Microsoft consulting, 10,000+ deployments
• Pricing: Free tier available; Standard from ~$1.61/unit/day (~$49/month per unit)

What is Azure Web PubSub?

Azure Web PubSub is a managed WebSocket service built on the publish-subscribe pattern. It handles persistent connection management at scale. Developers focus on application logic rather than infrastructure.

Unlike Azure SignalR Service — which is designed for ASP.NET applications — Web PubSub is protocol-agnostic. It works with any WebSocket client in any programming language.

Two communication models

Web PubSub supports two subprotocols:

• Simple WebSocket subprotocol — basic messaging with minimal overhead
• JSON-based subprotocol — structured messages with built-in group management, user authentication, and permission control

Server-side event handlers process upstream messages through webhooks or Azure Functions. This lets you build serverless real-time architectures.

Key features

• Native WebSocket support — no proprietary client libraries required
• Publish-subscribe pattern with groups, users, and connection targeting
• Event-driven architecture via HTTP webhooks or Azure Functions
• Client-to-group messaging without server round-trips
• Dynamic group management — add or remove connections at runtime
• User identity binding — link WebSocket connections to authenticated users
• Fine-grained permission system for client send access
• TLS 1.2 encryption on all connections
• Private endpoints via Azure Private Link
• REST API for sending messages, managing connections, and querying status

Pricing tiers

Free tier

• 20 concurrent connections
• 20,000 messages per day
• 1 unit maximum
• Best for development and prototyping

Standard tier

• ~$1.61 per unit per day (~$49/month per unit)
• 1,000 concurrent connections per unit
• 2 million messages per unit per day included
• Scale to 100 units (100,000 concurrent connections)
• Additional messages billed at $1 per million

Premium tier

• Higher per-unit cost with enhanced SLA
• Private endpoints and custom domains
• Higher message throughput limits
• Availability zone support for mission-critical workloads
• Recommended for enterprise production deployments

Enterprise use cases

• Live dashboards — push real-time KPIs and alerts to Power BI embedded dashboards and custom UIs
• Collaborative editing — Google Docs–style real-time cursor tracking and conflict resolution
• Enterprise chat — group conversations with presence indicators and message history
• Live notifications — push alerts to web and mobile clients for order status and workflow triggers
• IoT telemetry — stream sensor data to browser dashboards for real-time monitoring
• Financial data streaming — real-time stock quotes, trade notifications, and market data feeds

EPC Group has built live dashboards for Fortune 500 operations centers, real-time notification systems for healthcare facilities, and collaborative tools for financial services firms.

Integration with Azure services

• Azure Functions — trigger and output bindings for serverless event processing
• Azure Event Grid — react to connection and disconnection events
• Azure API Management — proxy WebSocket connections for throttling and monitoring
• Microsoft Entra ID — authenticate WebSocket clients with enterprise identity
• Azure Monitor — metrics and logs for connection counts, throughput, and errors
• Azure Private Link — connect over private endpoints within your virtual network

Best practices for enterprise deployments

• Use the JSON subprotocol for group management and permission control
• Always validate client tokens before establishing WebSocket connections
• Build clients with automatic reconnection using exponential backoff
• Prefer group-based messaging over individual connection broadcasting
• Set up alerts when approaching the concurrent connection limit per unit
• Route logs to Azure Monitor for troubleshooting
• Use private endpoints in production to prevent unauthorized access

Frequently asked questions

What is the difference between Azure Web PubSub and Azure SignalR Service?

SignalR Service is designed for ASP.NET Core apps using the SignalR library. Web PubSub uses standard WebSocket protocols and works with any programming language or client framework. Choose Web PubSub for cross-platform applications. Choose SignalR Service for ASP.NET-centric projects.

How many concurrent connections can Web PubSub support?

Each Standard unit supports 1,000 concurrent connections. You can scale to 100 units per instance (100,000 connections). For higher scale, deploy multiple instances behind a traffic manager. EPC Group has architected solutions supporting tens of thousands of simultaneous connections.

Can Web PubSub run serverless?

Yes. Azure Functions trigger and output bindings let you process client events and send responses without an always-on server. This is a common pattern for enterprise notification systems.

Is Web PubSub suitable for financial data applications?

Yes. With TLS 1.2 encryption, private endpoints, and Entra ID authentication, Web PubSub meets requirements for financial data applications. It runs in production for real-time quote streaming and trade notifications.

How does Web PubSub handle client disconnections?

Web PubSub monitors connections via WebSocket heartbeat and fires a disconnected event to your event handler. Clients should implement automatic reconnection with exponential backoff. Group memberships are briefly retained after disconnection for seamless rejoin.

Why choose EPC Group for Azure Web PubSub?

EPC Group is a Houston-based Microsoft consulting firm with 29 years of enterprise implementation experience and 10,000+ successful deployments across Power BI, Microsoft Fabric, SharePoint, Azure, Microsoft 365, and Copilot.

Our governance-first approach means every engagement starts with a security and compliance assessment. Senior architects — not rotating juniors — lead every project. We deliver for HIPAA, SOC 2, FedRAMP, and CMMC environments.

Call (888) 381-9725 or email contact@epcgroup.net for a free architecture consultation.