Note that all subscriptions require a WebSocket connection.

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Native EVM subscriptions

Developers can use the following native methods to subscribe to events:

eth_subscribe('newHeads')

eth_subscribe('newPendingTransactions')

eth_subscribe('logs')

The subscriptions created can be cleared using the following method:

eth_unsubscribe

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web3.js subscriptions

The web3.js library also offers subscription methods. web3.js subscriptions are the successors of the deprecated web3.eth.filter methods and provide a way for developers to receive real-time updates about events on the blockchain without constantly polling the blockchain for new data. Subscriptions can be created using one of the following methods:

subscribe('newBlockHeaders')

subscribe('pendingTransactions')

subscribe('logs')

subscribe('syncing')

The subscriptions created can be cleared using the following method:

clearSubscriptions