> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gomaestro.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Event Manager

> Real-time blockchain event notification system with programmable webhooks for responsive applications and reduced API usage.

*Real-time event notification systems* are a game-changer for developers building **responsive, reactive applications.** Instead of "pull-based" APIs requiring the client to explicitly request data from the blockchain, "push-based" APIs automatically send data to a client as soon as certain events happen on-chain.

Leading to:

1. Significant savings in API usage and billing
2. Increased app responsiveness with better user experience.

**Maestro's Event Manager** is a *blockchain event notification service* that monitors the blockchain network for user-specified events and notifies applications in real-time via *Webhooks*.

This allows applications to stay updated with on-chain activities such as:

* **Wallet Event:** Track wallet deposits and withdraws
* **Token Activity:** Token transfers or NFT mints
* **Script Execution:** Execution of scripts and smart-contracts
* **Mempool State:** Pending transactions in the mempool
* **Network Activity:** New block minted or blockchain reorgs

## Mempool-Aware Event Notifications

**Maestro's Event Manager** has a unique feature in that it is "*mempool-aware."* That means every configured Event Webhook has two types of notification:

1. **Mempool Notification**: Triggered when the event is detected in the mempool
2. **Onchain Notification**: Triggered when the event is first minted onchain (block confirmation = 1).

## Benefits of Event-Driven App Architecture

By subscribing to these notifications, developers can create applications that react instantly to blockchain activity, **improving user experience and enabling a variety of innovative functionalities.**

1. **Reduced Overhead:** Instead of constantly querying node data to check if something happened onchain, your app can rely on real-time push notifications, resulting in **significantly fewer API calls.**
2. **Real-time Experience:** Create a responsive app that immediately updates users with their most important events creating a **better user experience**. (e.g., “your NFT was just transferred!”)
3. **Scalability and Cost Savings:** Maestro's Event Manager handles the heavy lifting of monitoring the chain so your app never misses an important event. This results in **reduced infrastructure complexity and long-term cost savings**.

***

# Service Availability

The Event Manager service is available on the following blockchains:

| Service           | Bitcoin                                              | Cardano       | Dogecoin      |
| :---------------- | :--------------------------------------------------- | :------------ | :------------ |
| **Event Manager** | [API Reference](/bitcoin/event-manager-api/overview) | *Coming Soon* | *Coming Soon* |

## Event Types Available

| **Event Type**               | **Notify on**                                                                                             | **Trigger Conditions**                                                                                          |
| :--------------------------- | :-------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------------------------------------------------- |
| **Transaction Notification** | Specific transaction accepted into the mempool and then confirmed onchain                                 | **Trigger**=Transaction
**Field**= Transaction ID
**Operator**= equal to
**Value**= Transaction ID  |
| **Address Notification**     | Specific address withdrawals or deposits by a transaction entering the mempool and then confirmed onchain | **Trigger**=Transaction
**Field**= Sender or Receiver
**Operator**= containts
**Value**= Address ID |
|                              |                                                                                                           |                                                                                                                 |

### Using the Event Manager

See usage instructions [here](/bitcoin/tutorials-and-guides/integrating-event-manager-into-your-application#configure-and-manage-event-triggers-in-the-maestro-dashboard).

## Common Use Cases for Real-Time Event Notifications

### DeFi Protocol Monitoring

**Liquidity Pool Events**: Get alerts when large liquidity deposits or withdrawals occur, or if pool parameters change.
**Loan Liquidations:** Notify borrowers (or watchers) in real-time when a position is at risk or has been liquidated.

### NFT Marketplace & Collectibles

**Mint Tracking:** Monitor when new tokens are minted so you can update supply or notify users.
Transfer/Ownership Updates: Send push notifications when an NFT changes hands.
**Auction Bids:** Real-time updates for any new bids or final sales.

### Wallet & Portfolio Tracking

\*\*Address Activity: \*\*Keep track of inbound/outbound transactions for a user’s wallet. Helpful for generating push notifications.
**Token Balance Changes:** When an address receives a new token or sells a portion of a token.

### Transaction Lifecycle Tracking

**Pending → Mined → Confirmed:** Provide instant feedback to users about where their transaction is in the pipeline.
**Dropped or Replaced Transactions:** Notify users if their transaction was replaced by a new one with a higher fee.

### Security & Monitoring

**Smart Contract Exploit Detection:** Set up alerts for large, abnormal transactions on known vulnerable contracts.
**Whitelist/Blacklist:** Immediately know if a blacklisted address interacts with your protocol.