eth_subscribe RPC Method

Parameters

subscription name

string

The type of event you want to subscribe to (i.e., newHeads, logs). This method supports the following subscription types:

newHeads

It fires a notification each time a new header is appended to the chain, including chain reorganizations

logs

It returns logs that are included in new imported blocks and match the given filter criteria

data

object

The arguments such as an address, multiple addresses, and topics. Note, only logs that are created from these addresses or match the specified topics will return logs

Returns

result

object

The hex encoded subscription ID. This ID will be attached to all received events and can also be used to cancel the subscription using eth_unsubscribe

parentHash

The hash of the parent block

sha3Uncles

The SHA3 of the uncles data in the block

miner

The address of the beneficiary to whom the mining rewards were given

stateRoot

The root of the final state trie of the block

transactionsRoot

The root of the transaction trie of the block

receiptsRoot

The root of the receipts trie of the block

logsBloom

The bloom filter for the logs of the block. null if pending

difficulty

The integer of the difficulty for this block encoded as a hexadecimal

number

The block number of the requested block encoded as hexadecimal. null if pending

gasLimit

The maximum gas allowed in this block encoded as a hexadecimal

gasUsed

The total used gas by all transactions in this block encoded as a hexadecimal

timestamp

The UNIX timestamp for when the block was collated

extraData

The “extra data” field of this block

mixHash

A string of a 256-bit hash encoded as a hexadecimal

nonce

The hash of the generated proof-of-work. null if pending

baseFeePerGas

A string of the base fee encoded in hexadecimal format. Please note that this response field will not be included in a block requested before the EIP-1559 upgrade

withdrawalsRoot

The withdrawal root and null if pending

hash

The block hash of the requested block. null if pending

Request

1
wscat -c  \ 
2
# wait for connection 
3
{"id":1,"jsonrpc":"2.0","method":"eth_subscribe","params":["newHeads"]}

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