eth_getFilterChanges

Polling method for a filter, which returns an array of logs which occurred since last poll on Avalanche C-Chain.

Parameters

1. QUANTITY - the filter id

{
  "jsonrpc": "2.0",
  "method": "eth_getFilterChanges",
  "params": [
    "0x16"
  ],
  "id": 73
}

Returns

Array - Array of log objects, or an empty array if nothing has changed since last poll.

Implementation Example

cURL

curl -X POST https://api-avalanche-mainnet-archive.n.dwellir.com/YOUR_API_KEY/ext/bc/C/rpc \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getFilterChanges",
    "params": [
      "0x16"
    ],
    "id": 73
  }'

JavaScript

const response = await fetch('https://api-avalanche-mainnet-archive.n.dwellir.com/YOUR_API_KEY/ext/bc/C/rpc', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    jsonrpc: '2.0',
    method: 'eth_getFilterChanges',
    params: [
      '0x16'
    ],
    id: 73
  })
});

const data = await response.json();
console.log(data.result);

Response Example

{
  "id": 73,
  "jsonrpc": "2.0",
  "result": [
    {
      "logIndex": "0x1",
      "blockNumber": "0x1b4",
      "blockHash": "0x8216c5785ac562ff41e2dcfdf5785ac562ff41e2dcfdf829c5a142f1fccd7d",
      "transactionHash": "0xdf829c5a142f1fccd7d8216c5785ac562ff41e2dcfdf5785ac562ff41e2dcf",
      "transactionIndex": "0x0",
      "address": "0x16c5785ac562ff41e2dcfdf829c5a142f1fccd7d",
      "data": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "topics": [
        "0x59ebeb90bc63057b6515673c3ecf9438e5058bca0f92585014eced636878c9a5"
      ]
    }
  ]
}

Note: Filters on Avalanche have fast update rates due to the network's sub-second block times.

---

Need help? Contact our support team or check the Avalanche documentation.