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Azure Web PubSub website screenshot

Azure Web PubSub

Azure Web PubSub is a fully-managed service that enables building real-time, two-way messaging applications using publish-subscribe patterns over WebSockets. It supports broadcasting messages to clients in groups, sending messages to specific connections or users, and integrating with serverless event handlers for scalable real-time experiences.

agent ready

Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.

Kin Score

API Evangelist profiles Azure Web PubSub the way a machine reads it — 29 machine-readable artifacts across 8 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.

Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Azure Web PubSub scores 68.9/100 (strong), with a separate agent-readiness read of 54/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.

Kin Score

This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 68.9/100 · strong
Contract Quality 15.5 / 25
Developer Ergonomics 10.4 / 20
Commercial Clarity 16.8 / 20
Operational Transparency 8.9 / 13
Governance 7.3 / 12
Discoverability 10.0 / 10
Agent readiness — 54/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3

How we profile Azure Web PubSub

Each block below is one kind of artifact we hold for Azure Web PubSub. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.

APIs 8

Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.

Individual APIs this provider publishes, each with its own machine-readable definition.

Azure Web PubSub Client and Upstream Events

AsyncAPI 2.6 description of the Azure Web PubSub client WebSocket subprotocols (json.webpubsub.azure.v1 and json.reliable.webpubsub.azure.v1) and the CloudEvents 1.0 HTTP upstre...

Azure Web PubSub Hubs REST API

REST API for managing hub configurations within a Web PubSub instance. Hubs provide logical isolation for messaging and allow per-hub configuration of event handlers, anonymous ...

Azure Web PubSub for Socket.IO REST API

REST API for managing Azure Web PubSub for Socket.IO instances. Provides a fully managed Socket.IO server replacement that allows existing Socket.IO applications to scale to mil...

Azure Web PubSub Private Endpoint Connections REST API

REST API for managing private endpoint connections to a Web PubSub service instance. Enables secure, private connectivity from virtual networks to Web PubSub through Azure Priva...

Azure Web PubSub Shared Private Link Resources REST API

REST API for managing shared private link resources for a Web PubSub service. Enables outbound private connectivity from Web PubSub to other Azure resources such as Key Vault an...

Azure Web PubSub ClientToken API

Generate JWT tokens for client connections

Azure Web PubSub Hub API

Send messages and manage connections, groups, and users in a hub

Azure Web PubSub Permission API

Permission management for client connections

Scroll within the panel for all 8 ·

Open Collections 1

Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Arazzo Workflows 12

Real integrations are rarely a single call. Arazzo describes the multi-step sequences — auth, then create, then confirm — so both a human and an agent can follow the choreography, not just the endpoints.

Multi-step API workflows described with the Arazzo specification.

Azure Web PubSub Check then Close Connection

Verify a connection exists before closing it, branching on whether it is present.

ARAZZO

Azure Web PubSub Direct Connection Message

Confirm a connection exists, then send a targeted message to just that connection.

ARAZZO

Azure Web PubSub Grant Permission then Send to User

Grant a connection a group permission, then deliver a message to that user.

ARAZZO

Azure Web PubSub Grant Permission if Missing

Check whether a connection already holds a permission, granting it only when absent.

ARAZZO

Azure Web PubSub Broadcast to Group if Active

Only broadcast to a group when it currently has connected members.

ARAZZO

Azure Web PubSub Warn Group and Tear Down

Broadcast a final warning to a group, then close every connection in that group.

ARAZZO

Azure Web PubSub Join Group, Send, then Leave

Add a connection to a group, broadcast a message to that group, then remove the connection.

ARAZZO

Azure Web PubSub Notify User if Online

Send a user a message only when they currently have at least one live connection.

ARAZZO

Azure Web PubSub Provision Client and Join Group

Mint a client token, add the connection to a group, and announce the join to that group.

ARAZZO

Azure Web PubSub Revoke Permission and Evict Connection

Revoke a connection's group permission, then forcibly close that connection.

ARAZZO

Azure Web PubSub Generate Token then Broadcast

Mint a client access token for a hub and immediately broadcast a message to every connection.

ARAZZO

Azure Web PubSub Onboard User to Group

Add a user to a group and welcome them with a targeted message in one flow.

ARAZZO

Scroll within the panel for all 12 ·

Pricing Plans 1

Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.

Published pricing tiers and plan structures.

Rate Limits 1

Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.

Documented rate limits and quota policies.

FinOps 1

Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.

Cost, billing, and metering signals for API financial operations.

Event Specifications 1

Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Azure Web PubSub

Azure Web PubSub is a fully managed real-time messaging service from Microsoft Azure that lets clients exchange publish/subscribe messages over WebSockets without operating WebS...

ASYNCAPI

Spectral Rules 1

Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.

Azure Web PubSub API Rules

8 rules · 1 errors · 6 warnings

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Microsoft Azure Web Pubsub Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.

Recommended x-agentic-access execution contracts for AI agents.

Microsoft Azure Web Pubsub Agentic Access

19 operations · 15 acting · 1 human-in-the-loop

19 operations · 15 acting

AGENTIC

Resources

Every other property we hold for Azure Web PubSub — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.

Get Started 4

Portal, sign-up, and the first successful call

Documentation 1

Reference material describing how the API behaves

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

Access & Security 3

Authentication, authorization, and security posture

Company 2

The organization behind the API

← All providers · Data indexed from github.com/api-evangelist/microsoft-azure-web-pubsub · machine-readable index on apis.io