eth_newPendingTransactionFilter | Fantom

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

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Response

• result — a hexadecimal string representing the ID of the newly created filter

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Code examples

Use the following methods with the filter ID:

• eth_getFilterChanges to retrieve updates
• eth_uninstallFilter to remove the filter

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eth_newPendingTransactionFilter code examples

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();

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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.