_Circle’s webhooks are an automated method for apps to receive notifications the moment a transaction is completed or fails to complete. Circle will make a request to your application when an operation is completed. That means your app doesn’t need to poll Circle to know whether an operation has completed in the blockchain—the confirmation will arrive automatically._
## Set Up Subscriptions
Through the Circle UI in Sandbox or Production, you can set up Webhoook subscriptions. This can be done by:
Navigating to Developer → Subscriptions in Sandbox or Production.
Selecting Add Subscription
Entering an endpoint URL you would like notifications to go to.
Selecting Add Endpoint
If you are just getting started you can use our notification quickstart \[[link](🔗)] guide to setup you local environment and acquire a subscription endpoint URL.
## View Subscriptions
Via Circle’s UI you can view all subscriptions registered to your account on Developer → Subscriptions. Currently, our Sandbox environment permits up to 3 subscriptions and our Production environment supports one.
## Remove Subscriptions
While viewing subscriptions you are also provided the option to remove subscriptions. This is done by simply selecting kebab on the Endpoint and selecting remove.
## API Endpoints
All these actions can also be done using Circle’s APIs. See [API reference subscriptions](🔗) for more detail.