newFlashblockTransactions

Subscribe to receive each transaction as it is preconfirmed into a Flashblock.

Subscribe to receive each transaction as it is preconfirmed. Pass true as the second parameter to receive full transaction and log data in each message.

This method is only available on Flashblocks-aware endpoints. Connect to https://mainnet-preconf.base.org (or https://sepolia-preconf.base.org) to use it.

Requires base/base minimum client version v0.3.1.

Parameters

subscriptionType · string · required

Must be "newFlashblockTransactions".

full · boolean

Optional. If true, each notification includes the full transaction object and associated logs. If false or omitted, notifications contain minimal transaction data.

Returns

result · string

Hex-encoded subscription ID.

Example

Subscribe

{"jsonrpc": "2.0", "id": 1, "method": "eth_subscribe", "params": ["newFlashblockTransactions"]}