Subscriptions are a feature of the Arbitrum JSON-RPC API that allows developers to receive real-time updates on various blockchain events. Developers can subscribe to specific events of interest, such as new block headers or contract events.
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:
The subscriptions created can be cleared using the following method:
Arbitrum does not have pending transactions
Note that Arbitrum does not have pending transactions as transactions on Arbitrum are instantly approved or declined by the sequencer.
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:
The subscriptions created can be cleared using the following method: