eth_newPendingTransactionFilter

The eth_newPendingTransactionFilter method creates a filter in the node to notify when new pending transactions arrive in the mempool. This method returns a filter ID that can be used with eth_getFilterChanges to poll for hashes of newly submitted transactions that haven't been mined yet.

This method is valuable for applications that need to monitor real-time transaction activity before confirmation, such as MEV (Maximal Extractable Value) bots, transaction monitoring services, frontrunning detection systems, mempool analytics tools, and applications that track specific addresses or transaction patterns. Once created, use eth_getFilterChanges with the returned filter ID to retrieve transaction hashes of new pending transactions since your last poll. Note that pending transactions may never be mined if they have insufficient gas prices or other issues.

Filters timeout after 5 minutes of inactivity. Regular polling with eth_getFilterChanges keeps the filter active.

Parameters

This method does not require any parameters.

Return Object

Request Example

Response Example