What is Webhook?
A webhook is a URL that one system calls automatically to notify or trigger another system when something happens, instead of that system having to poll for updates.
Instead of an application repeatedly asking "did anything change yet?", a webhook lets it register a URL that gets called the moment an event occurs. The caller sends an HTTP request (usually POST) with details about the event to that URL.
Webhooks are the common glue between automation tools (n8n, Zapier, Make) and other software — you give the automation tool a URL, and it fires that URL to start a workflow.
On VibeOpenClaw
An OpenClaw skill can call an outbound webhook — for example, hitting an n8n or Zapier "Catch Hook" URL — so a chat message can trigger a multi-step automation in another tool.