AsyncAPI channel · Knock
· Knock Outbound Webhooks
webhooks/messages
Message lifecycle events for one of the configured outbound webhook endpoints.
Channel address
webhooks/messages
Operations
subscribe
receiveMessageEvent
Messages
message.sent
Content-Type:
message.delivered
Content-Type:
message.delivery_attempted
Content-Type:
message.undelivered
Content-Type:
message.bounced
Content-Type:
message.seen
Content-Type:
message.unseen
Content-Type:
message.read
Content-Type:
message.unread
Content-Type:
message.archived
Content-Type:
message.unarchived
Content-Type:
message.interacted
Content-Type:
message.link_clicked
Content-Type:
About AsyncAPI
The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.
Browse every event-driven channel on the APIs.io network or compare with the broader Agent Skill and MCP server surfaces of the same providers.
Work with this as data
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