Traditional API request flow
Your application initiates the request, chooses when to ask and waits for the remote service to respond. This is ideal when you need data on demand or need to perform a deliberate action.
Webhook event flow
The provider initiates the request when an event occurs. Your application exposes a reachable endpoint and reacts to incoming deliveries. This avoids repeatedly polling for changes that may not have happened.
Why real systems use both
A webhook can tell your application that something changed, while an API request can fetch the latest authoritative state. This combination is common because event notifications and on-demand data access solve different problems.
The failure modes are different
With an API call, the caller immediately sees the response. With webhooks, delivery happens asynchronously and can be retried. That makes observability, signature verification, idempotency and delivery tracing especially important.
Choose based on data freshness and control
Use webhooks when timely event notification matters and the provider supports them. Use API requests when your application needs direct control over when data is retrieved or an action is performed.
Questions developers ask
Is a webhook an API?
A webhook uses HTTP like many APIs, but it describes an event-driven callback pattern rather than a general request interface.
Are webhooks real time?
They are often near-real-time, but network delays, queues and retries mean delivery is not guaranteed to be instantaneous.
Can I use webhooks and polling together?
Yes. Some systems use webhooks for fast notification and periodic reconciliation through an API for resilience.
Built for practical debugging
This guide is written to help developers reproduce and isolate webhook failures. Examples use synthetic data, and production security guidance should always be checked against the official documentation for the provider you integrate.
Last reviewed: September 2026.