Parameters

subscription type

string

REQUIRED

The type of Flashblock event you want to subscribe to. This method supports the following Flashblock-specific subscription types:

newFlashblockTransactions

Streams transactions as they are included in Flashblocks. Optionally pass a second boolean parameter set to true for enriched transaction and log data

pendingLogs

Streams logs matching a given filter as they appear in Flashblocks. Accepts an optional filter object with address and topics fields

newFlashblocks

Streams block state updates for each new Flashblock

options

object

Optional parameters depending on the subscription type. For newFlashblockTransactions, pass true as a boolean for enriched data. For pendingLogs, pass a filter object with address and topics fields

address

string

The contract address or a list of addresses from which logs should originate (used with pendingLogs)

topics

array

An array of topic hashes to filter logs by (used with pendingLogs)

Returns

result

string

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

Request

1
wscat -c wss://docs-demo.base-mainnet.quiknode.pro/ \
2
# wait for connection
3
{"id":1,"jsonrpc":"2.0","method":"eth_subscribe","params":["newFlashblocks"]}

1
wscat -c wss://docs-demo.base-mainnet.quiknode.pro/ \
2
# wait for connection
3
{"id":1,"jsonrpc":"2.0","method":"eth_subscribe","params":["newFlashblocks"]}

Response

1
{
2
  "id": 1,
3
  "jsonrpc": "2.0",
4
  "result": "0x1887ec8b9589ccad00000000000532da"
5
}

1
{
2
  "id": 1,
3
  "jsonrpc": "2.0",
4
  "result": "0x1887ec8b9589ccad00000000000532da"
5
}

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