> For the complete documentation index, see [llms.txt](https://sending-network.gitbook.io/sending.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sending-network.gitbook.io/sending.network/use-cases/dapp-notifications.md).
# Dapp Notifications
Sending.Network (SDN) provides a universal inbox to receive messages from dapps and wallets. This way, users can receive time-sensitive dapp messages, like an NFT floor price drop or an imminent liquidation in a lending protocol position. There would be tremendous user scenarios for such communication. A decentralized exchange can notify users when the desired gas price is reached, or an NFT marketplace sends out heads-up notifications of NFT auctions, saving users’ effort from regularly checking.
Overview
Below we provide a specific use case describing how the user can receive a decentralized exchange (DEX) notification inside the wallet app when the desired gas price is reached.
### **Use Case Name**
Receiving DEX gas price notification from wallet
### **Actors**
1. DEX
2. Wallet app
3. User
4. Sending.Network protocol
### **Preconditions**
1. The DEX has integrated the Sending.Network protocol.
2. The wallet app has integrated the Sending.Network protocol.
### **Basic Flow of Events**
1. The use case begins when a user authenticates in the DEX.
2. The user sets a target gas price as a notification condition.
3. When the gas price is met, DEX calls Sending.Network service message interface to send out a notification message to the user's wallet address.
4. The wallet receives the DEX message.
5. The wallet displays the message.
6. The use case ends successfully.
Flow Chart
### **Post-conditions**
The user successfully receives the DEX gas price notification and the message has been saved in the wallet app.