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eth_getFilterChanges RPC Method

The API credit value for this method is 2 . To learn more about API credits and each method's value, visit the API Credits page.

Parameters:

  1. filter ID - string - The filter id that is returned from eth_newFilter, eth_newBlockFilter or eth_newPendingTransactionFilter

Returns:

  1. array - An array of one of the following, depending on the filter type, or empty if there were no changes since the last poll:
    • eth_newBlockFilter:

      blockHash - The 32 byte hash of a block that meets your filter requirements

    • eth_newPendingTransactionFilter:

      transactionHash - The 32 byte hash of a transaction that meets your filter requirements

    • eth_newFilter:

      address - An address from which this log originated

      topics - An array of zero to four 32 Bytes DATA of indexed log arguments. In Solidity, the first topic is the hash of the signature of the event (e.g. Deposit(address, bytes32, uint256)), except you declare the event with the anonymous specifier

      data - It contains one or more 32 Bytes non-indexed arguments of the log

      blockNumber - The block number where this log was in. null when its a pending log

      transactionHash - The hash of the transactions this log was created from. null when its a pending log

      transactionIndex - The integer of the transaction's index position that the log was created from. null when it's a pending log

      blockHash - The hash of the block where this log was in. null when its a pending log

      logIndex - The integer of the log index position in the block. null when it's a pending log

      removed - It is true when the log was removed due to a chain reorganization, and false if it's a valid log

Code Examples:

var myHeaders = new Headers();
myHeaders.append("Content-Type", "application/json");

var raw = JSON.stringify({
  "method": "eth_getFilterChanges",
  "params": [
    "YOUR_FILTER_ID"
  ],
  "id": 1,
  "jsonrpc": "2.0"
});

var requestOptions = {
  method: 'POST',
  headers: myHeaders,
  body: raw,
  redirect: 'follow'
};

fetch("http://sample-endpoint-name.network.quiknode.pro/token-goes-here/", requestOptions)
  .then(response => response.text())
  .then(result => console.log(result))
  .catch(error => console.log('error', error));
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