POST
/
4ab982aa70a7baead515ffdb5915df3f
eth_newPendingTransactionFilter
curl --request POST \
  --url https://fantom-mainnet.core.chainstack.com/4ab982aa70a7baead515ffdb5915df3f \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "method": "eth_newPendingTransactionFilter",
  "params": [],
  "id": 1
}'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": [
    "<string>"
  ]
}

Fantom API method that creates a filter that listens for new pending transactions 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 — a hexadecimal string representing the ID of the newly created filter

​
Code examples

The filters created are stored on the blockchain client instance. The filter is automatically deleted if not polled within a certain time (5 minutes by default).

Use the following methods with the filter ID:

​
eth_newPendingTransactionFilter code examples

Note that the web3.eth.filter methods have been deprecated and replaced with the web3.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_newPendingTransactionFilter', []);
    console.log(filterId); // the filter ID returned by eth_newFilter
    return filterId
  } catch (error) {
    console.log(error);
  }
};

createFilter();

​
Use case

One way to use the eth_newPendingTransactionFilter method is to listen for new pending transactions at predefined intervals and extract specific data from them. For instance, a decentralized application might check for pending transactions every second and identify those that transfer a value greater than a certain amount of the FTM token. This could be useful for real-time monitoring high-value transactions or detecting potential fraud or security threats.

Body

application/json

Response

200 - application/json

The new filter ID.

The response is of type object.