# Sending Notifications Apps that want to use our notification protocol will receive access to a notification dashboard from where they can send notifications. They will be able to see several subscribed public keys, their casts, and other general statistics. Apart from the dashboard, we provide **API** **endpoints** that let apps integrate notifications in their custom business flows. Apps can send two types of notifications - **broadcast** and **unicast**. * Broadcast notifications are sent to **all** public keys subscribed to the app. * Unicast notifications are sent to a **single** targeted public key that is subscribed to the dApp. Broadcast notifications are **not** sent immediately; they are subject to review before being sent to users. ![Creating a cast](https://2465042048-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Mgv3_8586v0mVL4zZax%2Fuploads%2FwtDhqN8HZqbOSfq2AIsq%2Fimage.png?alt=media\&token=2367c995-418a-4f28-897c-2b19ed9752d8) #### Notification contains | Field | Mandatory | Note | | ----------------- | --------- | --------------------------- | | Title | Y | | | Body | Y | | | Icon | Y | Only shown on web | | Image | N | Only shown on mobile | | Action URL | N | Only works on web | | Platform | Y | | | Cast time | Y\* | For broadcast notifications | | Topic | Y | | | Target Public Key | Y\* | For unicast notifications | ### Notification Topics There are 3 default Notification Topics, users have options to opt-out of specific topics. Currently, we have: **General** - Used for marketing and general announcements **Security** - Used for announcements about security issues **Transactional** - Used when targeting specific/single user(s) about some event/transaction, etc.