Most Zapier triggers poll — they check an app every few minutes for new data. Webhooks by Zapier breaks that pattern: it gives you a URL that fires a Zap the instant something POSTs to it, and it lets a Zap POST out to any API. That makes it the tool for real-time automation and for connecting apps Zapier has no native integration with — at the cost of a few limitations you have to work within.
Catch Hook: instant triggers
The Catch Hook trigger gives you a unique Zapier URL. Configure any external system to POST to it — a webhook from your app, a payment provider, a form — and the Zap runs immediately with that payload, instead of waiting for the next poll. This is how you get near-real-time behaviour and how you integrate apps that are not in Zapier's catalogue: if it can send an HTTP request, it can trigger a Zap.
Sending data out
The Webhooks action does the reverse: POST, PUT, or GET to any endpoint from inside a Zap. This is your escape hatch for reaching an API Zapier does not natively support — call a custom endpoint, hit an ERP's REST API, notify an internal service. Between Catch Hook in and Webhooks out, you can wire Zapier to almost anything with an HTTP interface.
Catch Hook (unique Zapier URL) <- external system POSTs here
-> Filter / Formatter (shape and gate the payload)
-> app actions / Webhooks POST (do the work, call other APIs)Design around the limits
- The Catch Hook URL is effectively a secret — anyone with it can trigger your Zap. Treat it as sensitive, and validate the payload rather than trusting every hit.
- Zapier does not verify provider signatures for you; if the source signs its webhooks, add a Code step to verify, or at least check a shared token in the payload.
- Each caught webhook consumes a task, so a chatty source can burn through your task budget quickly — filter early to drop payloads you do not care about.
Because every received webhook costs a task, put a Filter step right after Catch Hook to stop Zaps you do not need from running the rest of their steps. On a high-volume source, filtering early is the single biggest lever on both task consumption and noise.
Webhooks by Zapier is the bridge between Zapier's convenience and the real-time, any-API world: Catch Hook for instant triggers, Webhooks actions for reaching anything over HTTP. Respect the sharp edges — the URL is a secret, signatures are on you, and every hit costs a task — and it becomes the most capable tool in the Zapier kit.
Independent software engineer in Nairobi specialising in Acumatica customisations, Laravel backends, and tax fiscalisation integrations across East and Southern Africa.