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

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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).

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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.

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Service Availability

The Event Manager service is available on the following blockchains:

Service	Bitcoin	Cardano	Dogecoin
Event Manager	API Reference	Coming Soon	Coming Soon

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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

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Using the Event Manager

See usage instructions here.

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Common Use Cases for Real-Time Event Notifications

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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.

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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.

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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.

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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.

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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.