Pub-Sub
Variants seen in the corpus:
Pub SubPub-SubPub/SubPubSubPubsubpubsub
Providers using this tag (51)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 4 Complete, well-documented, and agent-ready
Strong 3 Solid coverage with minor gaps
Developing 21 Usable, with meaningful gaps to close
Thin 15 Limited public surface area
Emerging 7 Early or largely undocumented
Minimal 1 Almost no public developer surface
APIs with this tag (46)
Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →
Exemplar 3 Complete, well-documented, and agent-ready
Salesforce Pub/Sub APIThe Salesforce Pub/Sub API is a gRPC-based API for publishing and subscribing to platform events, change da...Adobe I/O Events APIRegister event providers, define event metadata, subscribe webhook or journaling registrations, and ingest ...Oracle Siebel Event Pub/Sub APIEvent-driven integration framework enabling real-time communication between Siebel CRM and external systems...
Strong 3 Solid coverage with minor gaps
ThingSpeak MQTT APILightweight pub/sub MQTT broker at `mqtt3.thingspeak.com` over TCP (1883), TLS (8883), WebSocket (80), and ...IBM Event StreamsFully managed Apache Kafka service for high-throughput event streaming, event ingestion, and event stream d...Encore Infrastructure APIEncore's Infrastructure from Code API lets developers declare cloud infrastructure resources — PostgreSQL d...
Developing 17 Usable, with meaningful gaps to close
OCI Notifications APIPublish and subscribe messaging service for setting up communication channels using topics and subscription...Azure Web PubSub Client and Upstream EventsAsyncAPI 2.6 description of the Azure Web PubSub client WebSocket subprotocols (json.webpubsub.azure.v1 and...Salesforce Pub/Sub APIgRPC-based API for publishing and subscribing to platform events, change data capture events, and custom ch...Platform Events APIEvent-driven architecture API for publishing and subscribing to custom events for app integration. Supports...Salesforce Pub/Sub APIgRPC-based API for publishing and subscribing to platform events, change data capture events, and real-time...SPAN eBus MQTT APIPublish/subscribe streaming API hosted on SPAN Panel using the Electrification Bus (eBus) integration frame...HiveMQ MQTT over WebSocketMQTT 3.x and MQTT 5 messaging endpoints exposed over WebSocket for browser and edge clients to publish and ...Oracle Transactional Event Queues (TxEventQ)Kafka-compatible event streaming and message queuing built into Oracle Database.SAP Event Mesh APIThe SAP Event Mesh API provides access to the event brokering service within SAP Business Technology Platfo...Azure Event GridAzure Event Grid is a highly scalable, fully managed publish-subscribe event distribution service. It enabl...Twitch Pubsub APIExtension PubSub messagingApache Kafka Messaging APIThe core Kafka messaging protocol for producing and consuming records to/from topics using the native Kafka...NATS Messaging APIAsynchronous messaging API supporting core pub-sub, request-reply, queue groups, and JetStream persistent m...Pusher Channels APIPub/sub channels over WebSocket (client) and HTTP (server publish). Public, private, and presence channels ...Dapr PubSub APIPublish and subscribe messaging operations.Enterprise Event SystemReal-time, pub/sub-based event streaming surface. Lets institutions and partners react to events emitted ac...Scalar pubsub APIThe pubsub API from Scalar — 7 operation(s) for pubsub.
Thin 11 Limited public surface area
Roblox Open Cloud Messaging ServiceThe Messaging Service Open Cloud API publishes messages to a topic that running game servers can subscribe ...WIS2 Global Broker (MQTT)The WIS2 Global Broker provides an MQTT(S) publish-subscribe service that re-publishes real-time weather no...Sui PubSub APIThe PubSub API from Sui — 2 operation(s) for pubsub.Wazo Websocket Event Stream (wazo-websocketd)WebSocket gateway onto the Wazo internal event bus. An authenticated client subscribes to named platform ev...Apache EventMesh Messaging APIEvent-driven messaging via TCP, HTTP, and gRPC protocols. Events follow the CloudEvents specification. Supp...PubNub REST APISingle REST surface for publish, subscribe (long-poll), presence, history, signal, and App Context. Pub/Sub...Syndica Solana RPC (WebSocket) APIStandard Solana RPC PubSub WebSocket service supporting accountSubscribe, programSubscribe, signatureSubscr...Apache Pulsar Messaging APIPulsar messaging protocol for producing and consuming messages on topics, with support for multiple subscri...IPFS Pubsub APIThe Pubsub API from IPFS — 4 operation(s) for pubsub.RabbitMQ AMQP Messaging APIAMQP 0-9-1 messaging protocol for producing and consuming messages via exchanges, queues, and bindings with...Spring Data RedisEasy configuration and access to Redis from Spring applications. Provides low-level and high-level abstract...
Emerging 12 Early or largely undocumented
Nitric Topic ResourceSDK resource for declaring publish/subscribe topics for event-driven architectures. Nitric provisions the c...Apache Kafka REST Proxy APIThe Confluent REST Proxy provides a RESTful interface to an Apache Kafka cluster, making it easy to produce...Redis REST API (Redis Stack)Redis is an in-memory data structure store used as a cache, message broker, and streaming engine. Redis Sta...MQTT ProtocolMQTT (Message Queuing Telemetry Transport, ISO/IEC 20922) is a lightweight pub/sub messaging protocol widel...AblyA hosted realtime platform offering Pub/Sub Channels, Chat, Spaces, LiveObjects, LiveSync, and AI Transport...CentrifugoAn open-source language-agnostic realtime messaging server providing WebSocket, SSE, HTTP streaming, and We...MQTTA lightweight publish/subscribe protocol standardized by OASIS, designed for constrained devices and low-ba...PubNubA realtime platform offering Pub/Sub messaging, Presence detection, Chat SDKs, Functions (serverless), Even...PusherA hosted realtime API from MessageBird offering two products — Channels (pub/sub messaging) and Beams (push...Soketi Pusher-Compatible APIImplements the Pusher protocol (channels, private channels, presence channels, encrypted channels) for drop...MQTTOASIS standard messaging protocol for the Internet of Things. Lightweight publish/subscribe transport for r...Apache PulsarCloud-native, multi-tenant pub/sub and streaming platform with a tiered storage architecture (BookKeeper) t...
Score breakdown
Frequency
50.6
log-scaled weighted occurrences
Breadth
1.4
spread across providers
Quality lift
49.4
mean composite of providers using it
Cohesion
13.9
strength of nearest seed neighbor
Related tags
Event Streaming 10 co-occurrences
Event-Driven 14 co-occurrences
MQTT 7 co-occurrences
Topics 9 co-occurrences
Message Broker 5 co-occurrences
CloudEvents 5 co-occurrences
WebSockets 6 co-occurrences
Messaging 34 co-occurrences
Where this tag comes from
Provider tag22
Api tag46
Openapi tag5
Openapi op tag16
Cohort brief
Auto-generatedThe 51 providers in the APIs.io catalog tagged Pub-Sub, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
Providers
51
all scored
Mean Kin Score
40.7
+20.0 vs catalog 20.7
Mean Agent Readiness
22.6
+12.9 vs catalog 9.7
Spread
5–83.3
median 40.3 · σ 15.9
How the 51 split by band
Exemplar 4Strong 3Developing 21Thin 15Emerging 7Minimal 1
Facet averages, against the whole catalog
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 52.7 | 17.5 | +35.2 | 51 |
| Developer Ergonomics | 37.1 | 17.9 | +19.2 | 51 |
| Operational Transparency | 27.1 | 11.3 | +15.8 | 51 |
| Access Clarity | 36.3 | 22.3 | +14 | 51 |
| Contract Governance | 19.6 | 6.4 | +13.2 | 51 |
| Discoverability | 69 | 60.4 | +8.6 | 51 |
A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.
What this cohort publishes
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 16% | 16% | 0 |
| MCP server (first-party) | 12% | 7% | +5 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 29% | 9% | +20 |
| Security | 96% | 88% | +8 |
| Arazzo workflows | 18% | 2% | +16 |
| Governance rules | 78% | 13% | +65 |
mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.
Top by Kin Score
- 1 Salesforce 83.3
- 2 Svix 79.2
- 3 Adobe Suite 71.2
- 4 Oracle Siebel 67.1
- 5 ThingSpeak 62.7
- 6 IBM 62.6
- 7 Encore 55.8
- 8 Oracle 53
- 9 Azure Web PubSub 52.1
- 10 Amazon SNS 52
Top by Agent Readiness
- 1 Adobe Suite 61.5
- 2 Salesforce 52.2
- 3 Svix 49.9
- 4 Oracle 41.9
- 5 IBM 39.4
- 6 Wazo 32.1
- 7 Apache Kafka 31.9
- 8 Oracle Siebel 31.3
- 9 IPFS 29.4
- 10 Ably 29.1
All 51 members of this roster resolve to a scored provider in
the catalog.Generated from the catalog build of
25 August 2026, across 26891
providers, using the same computation served by the
APIs.io cohort API. Briefs are published for rosters of
5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.
MCP server
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https://apis.io/mcp
Tools for tags
7 MCP tools reach this
find_tagsBrowse and filter every tag in the catalog.get_cohortThis tag as a scored cohort — every provider carrying it, with scores.cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
This tag
curl "https://apis.io/api/v1/tags/pub-sub"
All tags
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort
curl "https://apis.io/api/v1/cohorts/tag/pub-sub"
The distribution (Pro)
curl "https://apis.io/api/v1/cohorts/tag/pub-sub/stats" \
-H "X-API-Key: $APIS_IO_KEY"Discovery needs no key. Ratings and market analysis are Pro.