Introduction
On-chain events are emitted by smart contracts when certain actions occur, such as when a token is transferred or when a new NFT is minted. Subscribing to on-chain events can help you to build applications that are more responsive and efficient.
Spydra is a low-code asset tokenization platform built on Hyperledger Fabric, an open-source blockchain framework. Spydra includes a listener framework that allows you to subscribe to on-chain events in real-time.
Benefits of subscribing to on-chain events
There are a number of benefits to subscribing to on-chain events, including:
Improved responsiveness: Subscribing to on-chain events allows you to build applications that are more responsive to changes in the blockchain. For example, you could use Spydra to build a real-time notification system for users who are interested in certain events, such as when a new NFT is minted or when a token is transferred to their wallet.
Increased efficiency: Subscribing to on-chain events can help you to build more efficient applications. For example, you could use Spydra to build an application that automatically tracks the movement of goods and materials through a supply chain.
Reduced costs: Subscribing to on-chain events can help you to reduce the costs of running your applications. For example, you could use Spydra to build an application that only listens to the events that are relevant to your business.
How to subscribe to on-chain events with Spydra
To subscribe to on-chain events with Spydra, you need to use the listener framework. The listener framework allows you to define listeners that will be notified when certain events occur.
You can define listeners at either the network level or the application level. Network level listeners are notified of all events that occur on the blockchain. Application level listeners are only notified of events that occur on the smart contracts that your application is interested in.
You can also use filters to define which events you want to be notified of. For example, you could filter out events that are not relevant to your business or events that are too frequent.
Example use case
Here is an example of how you could use Spydra to subscribe to on-chain events:
Imagine that you are building a decentralized exchange (DEX). You want to be able to notify users when new orders are placed or when their orders are executed.
You could use Spydra to define a listener that is notified when the NewOrder event is emitted by the DEX smart contract. You could also filter out events that are not relevant to your business, such as events that are emitted by other smart contracts.
Once you have defined the listener, you can start listening for events. Spydra will notify you whenever a new order is placed or when an order is executed. You can then use this information to update your DEX application and to notify users.
Features of Spydra's listener framework
Spydra's listener framework offers a number of features, including:
Real-time notifications: Spydra delivers notifications in real time, so you can be sure that you are always up-to-date on the latest events.
Network and application level listeners: You can define listeners at either the network level or the application level. This gives you flexibility to control which events you are notified of.
Filters: You can use filters to define which events you want to be notified of. This helps you to reduce noise and to focus on the events that are most relevant to your business.
Access to block and transaction level events: Spydra provides access to block and transaction level events. This allows you to build applications that are more complex and sophisticated.
Easy integration: Spydra supports webhooks by default. This makes it easy to integrate Spydra with your existing applications.
Complete isolation of events at network level: Spydra isolates events at the network level, making it a safe and secure solution.
Conclusion
Spydra's listener framework is a powerful tool that allows you to subscribe to on-chain events in real time. This can help you to build applications that are more responsive, efficient, and cost-effective.
If you are interested in subscribing to on-chain events, I recommend that you check out Spydra. It is a well-designed and easy-to-use platform that offers a number of powerful features.