Polygon zkEVM API method that creates a filter that watches for new blocks on the blockchain. It returns a filter ID, which can be used to retrieve the results using the eth_getFilterChanges method. The eth_newBlockFilter
method is useful for developers who must be notified of new blocks on the blockchain in real-time.
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Parameters
none
Response
result
β a hexadecimal string representing the ID of the newly created filter.
The filters created are stored on the blockchain client instance. The filter fill is automatically deleted if not polled within a certain time (5 minutes by default).
Use the following methods with the filter ID:
- eth_getFilterChanges to retrieve updates
- eth_uninstallFilter to remove the filter
eth_newBlockFilter
code examples
eth_newBlockFilter
code examples
web3.eth.filter
deprecationNote that the
web3.eth.filter
methods have been deprecated and replaced with theweb3.eth.subscribe
in web3.js. See web3.js subscriptions.
const ethers = require('ethers');
const NODE_URL = "CHAINSTACK_NODE_URL";
const provider = new ethers.JsonRpcProvider(NODE_URL);
const createFilter = async () => {
try {
const filterId = await provider.send('eth_newBlockFilter', []);
console.log(filterId); // the filter ID returned by eth_newFilter
return filterId
} catch (error) {
console.log(error);
}
};
createFilter();
from web3 import Web3
node_url = "CHAINSTACK_NODE_URL"
web3 = Web3(Web3.HTTPProvider(node_url))
def get_new_blocks():
try:
blocks_filter = web3.eth.filter('latest')
return blocks_filter
except Exception as e:
print(e)
blocks = get_new_blocks()
filter_id = blocks.filter_id
print(filter_id)
Use case
One use case for eth_newBlockFilter
in a simple DApp is to listen for new blocks and update the user interface with the latest block information.
When the DApp starts, it creates a new filter using eth_newBlockFilter
to listen for new blocks. When a new block is added to the blockchain, the filter is triggered, and the DApp retrieves the latest block information using a Web3 library.
Try the eth_newBlockFilter
RPC method yourself
eth_newBlockFilter
RPC method yourself