emerging · 0.1 capability schema

AsyncAPI

Score 23.7 / 100 51 providers 49 APIs Search apis.io →
Variants seen in the corpus: Async APIAsyncAPIasyncapi

Providers using this tag (51)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 7 Complete, well-documented, and agent-ready
RegalArtificial IntelligenceAI AgentsVoice AIContact Center10 APIs79.6Canvas LMSLearning ManagementEducationEdTechLMS16 APIs76.2Zoho CRMCRMSalesMarketing AutomationLead Management106 APIs74.1KnockNotificationMessagingInfrastructureWorkflows35 APIs71.9PaystackPaymentsAfricaFintechRecurring Billing21 APIs71.0WappalyzerTechnology DetectionTechnographicsWebsite AnalysisCMS Detection11 APIs70.9RemoteGlobal PayrollEORContractor ManagementContractor of Record40 APIs69.9
Strong 6 Solid coverage with minor gaps
WistiaVideo HostingVideo MarketingVideo AnalyticsLead Generation16 APIs65.1S&P GlobalCapital IQCommodity InsightsCredit RatingsDocument Extraction9 APIs64.6EtsyMarketplaceE-CommerceHandmadeListings28 APIs64.1FronteggAuthenticationAuthorizationIdentity ManagementCIAM64 APIs63.3FastlyCDNEdge CloudEdge ComputeWebAssembly80 APIs60.8Azure Event HubsBig DataEvent StreamingIoTMessage Ingestion10 APIs57.1
Developing 9 Usable, with meaningful gaps to close
StoryblokCMSContent DeliveryContent ManagementHeadless CMS11 APIs53.7Azure Web PubSubMessagingPub-SubReal-TimeServerless8 APIs52.1Oracle GoldenGateCDCData IntegrationData SynchronizationDatabase37 APIs50.9CDK GlobalAutomotiveDealer ManagementDMSAuto Retail13 APIs50.4Bump.shAPI ChangelogAPI DocumentationAPI HubAPI Governance8 APIs47.3RazorpayPaymentsPayment GatewayFintechIndia6 APIs45.3RollbarError TrackingMonitoringDebuggingDevOps15 APIs45.3Bunny.netCDNEdgeVideoStorage26 APIs40.9RokuStreamingTelevisionMediaEntertainment27 APIs40.3
Thin 18 Limited public surface area
KalshiPrediction MarketsEvent ContractsExchangeCFTC21 APIs39.1ColumnFintechBankingBackend-as-a-ServiceACH21 APIs37.1HoneybadgerError MonitoringException TrackingApplication Performance MonitoringUptime Monitoring9 APIs36.8MattermostMessagingCollaborationTeam ChatOpen-Source6 APIs36.1FernAgent ReadyArtificial IntelligenceAPI Definitions1 API36.0MaterializeStreamingData WarehouseSQLReal-Time4 APIs35.6StoplightAPI DesignAPI DocumentationAPI Governance6 APIs35.3EasyPostShippingLogisticsMulti-CarrierTracking11 APIs34.9WixCMSE-CommerceHeadlessWebsite Builder9 APIs34.9VimeoVideoStreamingVideo HostingLive Streaming5 APIs33.9ChartMogulSubscription AnalyticsSaaS MetricsRevenue AnalyticsMRR8 APIs32.8LiveKitReal-TimeWebRTCAudioVideo6 APIs32.4CeligoAPI ManagementAutomationData IntegrationIntegration13 APIs31.4CrispCustomer ServiceLive ChatHelp DeskMessaging3 APIs31.0ApicurioApache LicenseAPI DesignAPI RegistryAvro23 APIs30.5Acuity SchedulingAppointment SchedulingBookingCalendarScheduling5 APIs29.5AMQPAMQPAsynchronousMessage QueueMessaging1 API29.3TalkdeskContact CenterCCaaSVoiceWebhook1 API26.8
Emerging 10 Early or largely undocumented
Agent ReadinessAgent ReadinessAI AgentsAPI DiscoveryAPI Governance15 APIs25.0Spring Cloud StreamApache KafkaEvent-DrivenJava3 APIs23.2API Style GuidesAPI Style GuidesAPI DesignAPI GovernanceREST11 APIs20.0SpectralAPI DesignAPI LintingAPI Style Guide1 API19.2SpecLynxAPI DesignDeveloper ToolsJSON-Schema6 APIs18.8Test SpecificationsAcceptance TestingContract TestingDocumentationOpenAPI8 APIs18.1TemplatesTemplatesAPI DesignCode GenerationDocumentation6 APIs17.0API SpecificationsAPI SpecificationSpecification LanguagesAPI DesignContracts13 APIs15.4EventsEventEvent-DrivenEvent StreamingMessaging18 APIs14.9API LintingAPI DesignAPI GovernanceAPI LintingAPI Style Guide10 APIs14.4
Minimal 1 Almost no public developer surface
Event-Driven ArchitectureArchitectureAsynchronousCloudEvents6.4

APIs with this tag (49)

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 7 Complete, well-documented, and agent-ready
Regal Reporting WebhooksRegal publishes 40+ reporting webhook event types covering agent activity, call lifecycle (placed, complete...79.6Canvas Live EventsCanvas Live Events stream lifecycle events emitted by Canvas (course, enrollment, assignment, submission, g...76.2Zoho CRM Notifications API v2Instant Notifications API for Zoho CRM. Subscribers register a channel via POST /crm/v2/actions/watch with ...74.1Knock Outbound WebhooksOutbound webhooks fire message lifecycle (sent, delivered, seen, read, interacted, archived, link_clicked, ...71.9Paystack WebhooksOutbound webhook surface that notifies a single merchant-configured POST endpoint of transaction, dispute, ...71.0Wappalyzer Crawl APIDeep crawl API that indexes multiple pages of a website to build a comprehensive technology profile, suppor...70.9Remote WebhooksRemote emits webhook events for every meaningful state change across companies, employments, contractors, p...69.9
Strong 5 Solid coverage with minor gaps
Wistia WebhooksReal-time webhook deliveries from Wistia for documented media lifecycle events. Deliveries are HTTP POST wi...65.1Kensho Scribe Real Time APIReal-time streaming transcription over a WebSocket at wss://scribe.kensho.com/ws. Clients send an Authentic...64.6Etsy Open API v3 WebhooksAsyncAPI 2.6 description of Etsy's outbound webhook surface for the Open API v3. Covers the four documented...64.1Frontegg WebhooksAsyncAPI 2.6 description of Frontegg's outbound webhook surface. Covers authentication, MFA, user lifecycle...63.3Azure Event Hubs Messaging APIEvent-driven messaging API for publishing and consuming events via AMQP 1.0, Kafka, and HTTPS protocols. Su...57.1
Developing 9 Usable, with meaningful gaps to close
Storyblok WebhooksStoryblok emits webhook events when content actions occur in a space such as story publication, unpublicati...53.7Azure Web PubSub Client and Upstream EventsAsyncAPI 2.6 description of the Azure Web PubSub client WebSocket subprotocols (json.webpubsub.azure.v1 and...52.1Oracle GoldenGate AsyncAPI APIManage AsyncAPI specifications for data streams50.9Fortellis AsyncAPI Hello World ReferenceHello World AsyncAPI reference distributed by Fortellis to teach the asynchronous API pattern, channel topo...50.4Fortellis Event Relay Data Plane Proxy (AsyncAPI)AsyncAPI specification for the Fortellis Event Relay data-plane proxy used by event sources to publish even...50.4Razorpay WebhooksEvent-driven webhook surface that POSTs JSON payloads to a merchant-configured HTTPS endpoint when subscrib...45.3Rollbar WebhooksRollbar supports outbound webhook notifications for real-time event-driven integrations. Webhooks deliver p...45.3Bunny.net Stream WebhooksSigned HTTP POST webhooks delivered by Bunny Stream to the WebhookUrl configured on a Video Library wheneve...40.9Roku asyncapi APIThe asyncapi API from Roku — 3 operation(s) for asyncapi.40.3
Thin 20 Limited public surface area
Kalshi AsyncAPI SpecificationMachine-readable AsyncAPI description of the Kalshi WebSocket streaming API. Suitable for generating async ...39.1Column WebhooksHMAC-SHA256 signed event callbacks for ACH, wire, international wire (SWIFT), realtime (RTP/FedNow), book t...37.1Honeybadger Outbound Webhook NotificationsOutbound webhook notification surface delivered by Honeybadger to subscriber URLs configured via Project Se...36.8Mattermost WebSocket APIReal-time WebSocket event stream for Mattermost v4. Clients connect to /api/v4/websocket, authenticate via ...36.1FernFern transforms a single API source of truth (OpenAPI, AsyncAPI, Protobuf, OpenRPC, or the Fern Definition ...36.0Materialize Streaming Sources and Sinks (AsyncAPI)AsyncAPI 2.6 description of Materialize's event-driven integration surface: Kafka sources (CREATE SOURCE .....35.6Stoplight SpectralSpectral is an open-source JSON and YAML linter for creating automated API style guides and governance rule...35.3EasyPost Webhooks APIAsynchronous Event delivery surface. EasyPost POSTs Event objects to subscriber URLs whenever asynchronous ...34.9Wix WebhooksThe Wix webhook surface delivers signed JWT events to subscriber URLs registered in the Wix Dev Center. Eve...34.9Vimeo WebhooksAsyncAPI 2.6 specification for Vimeo's documented webhook surface, covering the Vimeo OTT customer and subs...33.9ChartMogul WebhooksOutbound webhook destination for ChartMogul. ChartMogul POSTs JSON event bodies to a subscriber-configured ...32.8LiveKit Signaling Protocol (WebSocket)Bi-directional WebSocket signaling protocol used by LiveKit clients to coordinate WebRTC sessions with the ...32.4Celigo integrator.io Webhook ListenersInbound webhook listeners exposed by integrator.io. Each listener provides an auto-generated public HTTPS U...31.4Crisp Realtime (Webhooks + RTM) v1Crisp realtime surface combining HTTP Web Hooks (signed plugin hooks and unsigned website hooks) and the So...31.0Apicurio Data ModelsApicurio Data Models is a Java and TypeScript library for parsing, validating, and manipulating OpenAPI and...30.5Apicurio RegistryApicurio Registry is a high-performance, runtime registry for schemas and API designs. It stores and manage...30.5Apicurio StudioApicurio Studio is a visual, zero-code API design tool for creating and editing OpenAPI and AsyncAPI specif...30.5Acuity Scheduling WebhooksAsyncAPI 2.6 definition for Acuity Scheduling's outbound webhook surface. Models the documented appointment...29.5AMQP Messaging APIAsyncAPI specification for AMQP messaging patterns including publish/subscribe, request/reply, and point-to...29.3Talkdesk Webhook SurfaceAsyncAPI 2.6 description of Talkdesk's publicly documented outbound webhook surface, covering the Events AP...26.8
Emerging 8 Early or largely undocumented
adidas API Guidelinesadidas group's API guidelines covering general principles, REST conventions, and asynchronous (Kafka / Asyn...20.0SpectralSpectral is a flexible JSON/YAML linter and style guide enforcer with built-in support for OpenAPI (v3.1, v...19.2SpecLynx OpenAPI ToolkitA VS Code extension providing semantic editing, real-time validation, linting, and live preview for OpenAPI...18.8AsyncAPI InitiativeAsyncAPI is an open specification standard for event-driven and message-based APIs. AsyncAPI documents defi...18.1AsyncAPI SpecificationAsyncAPI is the open standard for describing event-driven and message-driven APIs across protocols such as ...15.4Apicurio RegistryRed Hat's open-source API/schema registry that stores and validates OpenAPI, AsyncAPI, JSON Schema, Avro, P...14.4Redocly CLIRedocly's `lint` command identifies and reports problems in OpenAPI, AsyncAPI, Arazzo, or Open-RPC descript...14.4SpectralStoplight's flexible JSON/YAML linter for creating automated style guides, with baked-in support for OpenAP...14.4

Score breakdown

Frequency
48.5
log-scaled weighted occurrences
Breadth
1.4
spread across providers
Quality lift
50.3
mean composite of providers using it
Cohesion
7.6
strength of nearest seed neighbor

Related tags

API Design 9 co-occurrences API Governance 6 co-occurrences Protobuf 5 co-occurrences Event-Driven 8 co-occurrences JSON-Schema 5 co-occurrences OpenAPI 13 co-occurrences Kafka 5 co-occurrences Validation 5 co-occurrences

Where this tag comes from

Api tag49
Provider tag14
Openapi tag2
Openapi op tag5

Cohort brief

Auto-generated

The 51 providers in the APIs.io catalog tagged AsyncAPI, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
51
all scored
Mean Kin Score
41.4
+20.7 vs catalog 20.7
Mean Agent Readiness
22.2
+12.5 vs catalog 9.7
Spread
6.4–79.6
median 36.1 · σ 18.9
How the 51 split by band
Exemplar 7Strong 6Developing 9Thin 18Emerging 10Minimal 1
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Contract Quality 50.5 17.5 +33 51
Developer Ergonomics 36.1 17.9 +18.2 51
Access Clarity 38.9 22.3 +16.6 51
Contract Governance 22.5 6.4 +16.1 51
Operational Transparency 26.9 11.3 +15.6 51
Discoverability 71.7 60.4 +11.3 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
ArtifactThis cohortCatalogDifference
MCP server (any) 29% 16% +13
MCP server (first-party) 16% 7% +9
Agent Skills 0% 0% 0
OAuth scopes 25% 9% +16
Security 98% 88% +10
Arazzo workflows 22% 2% +20
Governance rules 88% 13% +75

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. 1 Regal 79.6
  2. 2 Canvas LMS 76.2
  3. 3 Zoho CRM 74.1
  4. 4 Knock 71.9
  5. 5 Paystack 71
  6. 6 Wappalyzer 70.9
  7. 7 Remote 69.9
  8. 8 Wistia 65.1
  9. 9 S&P Global 64.6
  10. 10 Etsy 64.1
Top by Agent Readiness
  1. 1 S&P Global 63.7
  2. 2 Knock 58.6
  3. 3 Wappalyzer 52.2
  4. 4 Regal 46.8
  5. 5 Zoho CRM 45.6
  6. 6 Wistia 35.6
  7. 7 Canvas LMS 35.4
  8. 8 Storyblok 34.9
  9. 9 Etsy 33.8
  10. 10 Wix 32.9
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

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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.
All 92 tools

Call it yourself

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This tag 
curl "https://apis.io/api/v1/tags/asyncapi"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/asyncapi"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/asyncapi/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

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