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POST
/
efb0a5eccd2caa5135eb54eba6f7f300
eth_newBlockFilter
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_newBlockFilter",
  "id": 1
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}
Optimism API method eth_newBlockFilter creates a new filter object that notifies subscribers when a new block is added to the blockchain. This method is particularly useful for applications that need to stay updated with the latest blocks for processing or monitoring purposes.
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​
Parameters

  • none — This method does not require any parameters.

​
Response

  • result — the ID of the created filter. This ID is used to identify the filter in subsequent calls to methods like eth_getFilterChanges or eth_getFilterLogs to retrieve updates about new blocks.

​
Use case

The eth_newBlockFilter method is essential for:
  • Applications that perform actions triggered by the addition of new blocks, such as updating a user interface with the latest transactions or block information.
  • Services that monitor the blockchain for security or analytical purposes, needing real-time data on block additions.
  • Wallets and exchanges that track new blocks to confirm transactions.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_newBlockFilter
​
id
integer
default:1

Response

200 - application/json

The ID of the created block filter

​
jsonrpc
string
​
id
integer
​
result
string
Last modified on August 7, 2025